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23- Paralichthys albiguttus, Individual (B) on black and white background (5 by 10 mm. rectangular),
381. 23- Paralichthys albiguttus, Individual (B) on black and white background (5 by 10 mm. rectangular), long axis of the fish parallel with short axis of rectangles... 24- Individual (B) on same background, long axis of fish continuously parallel with long axis of rectangles. 25- Individual (B) on the same background continuously rotated on a disk under the crystallizing dish.... 26- Individual (B) on black and white background (1 sq. cm. circles, area of white equal to that of black).....
9- Paralichthys albiguttus, 14 cm. long, individual (B), on black and white background (2 mm. squares)
382. 9- Paralichthys albiguttus, 14 cm. long, individual (B), on black and white background (2 mm. squares) from July 29, 11 a.m. to July 30, 3 p.m., after having been adapted to the background shown in figure 10. This indiviidual was extensively used in the study of adaption on artificial backgrounds. It is represented in many....figures. Note that numerous dark spots have appeared in the light areas shown in figure 10, and that the light spots in the dark areas have become more numerous and more conspicuous. 10- Individual (B) on black and white backgroune (5 mm. squares) from July 25, 2 p.m. to jUly 26, 11:30 a.m., after having been adapted to a white background. Note that the three very light gray areas around the ocelli...have become much darker and other dark spots have appeared. 11-Individual (B) on black and white backgroune (2 cm. squares) from August 1, 9 a.m., to 4:30 p.m., after having been adapted to 1 cm. squares, shown in figure 12. Note that the pattern has changed very little.12-Individual (B) opn black and white backgroune (1 cm. squares) from July 31, 11:40 a.m., to August 1, 9 a.m., after having been on (1 sq. cm. circles) from July 30, 3 p.m.., to July 31, 11:40 a.m. Note that the dark areas are darker than in figure 10.
1-Paralichthys albiguttus, 20 com. long, on fine variegated shells, yellow predominating partly buried
383. 1-Paralichthys albiguttus, 20 com. long, on fine variegated shells, yellow predominating partly buried as usually found in nature. 2-Paralichthys albiguttus, same individual two minutes later with the shells removed. 3- Paralichthys albiguttus, w1 cm long, on coarse shells of the same kind, partly buried, from August 16 to 19. 4-Same individual two minutes later with shells removed. Note that the pattern is much coarser than in figure 2 on the fine shells. In both the skin was distinctly yellowish in color.
13-Paralichthys albiguttus, Individual (B) on a smooth white background continuously from July 23, 2
384. 13-Paralichthys albiguttus, Individual (B) on a smooth white background continuously from July 23, 2 p.m., to July 25, 10 a.m. It was alternately on white and on black about equal time during the preceding seven days. The skin actually appeared much whiter and less mottled and the animal less conspicuous than the photograph indicates. This is partly due to the shadow in the background along the ventral side. In specimens kept continuously on white for two months the skin became much more uniformly white. 14- Individual (B) on black and white background (circles 5 mm. in diameter) from August 11, 12 m., to August 13, 1:30 p.m... 15- Individual (B) on black and white background 2 cm. squares from August 24, 11 a.m., to August 27, a.m., after having been adapted to white... 16- Individual (B) on black and white background (circles 5 mm. in diameter) from August 15, 10 a.,m., to August 16, 9 a.m. This photograph shows one of the most remarkable concealing patterns observed. The fish appeared to contain numerous holes.
5-Paralichthys albiguttus, on very fine gray sand, almost entirely covered with sand, from August 19
385. 5-Paralichthys albiguttus, on very fine gray sand, almost entirely covered with sand, from August 19 to 21. Note the two small depressions in the sand at the base of the caudal fin. The lower one is much more prominent than the other. This individual breathed only through the lower gill. The water which entered the mouth passed back under the body and oozed up through the sand, forming the depressions. The animal was very effectively concealed. 6-Same individual uncovered.... 7- Paralichthys, 13 cm. long, in a glass dish over very fine black sand. Note the remarkable similarity between the pattern and the shade in the fish, especially the central part of the body, and those of the sand. The tips of the fins and the tail have no pigment and consequently stand out boldly against the background. 8- Paralichthys albiguttus, 16 and 10 cm long, on a smooth jet black background. Note the conspicuous white spots. In some instances all of these, except a trace of the one at the base of the pectoral fin, disappeared entirely
48- Paralichthys albiguttus, 12 cm long, fully adapted to a very light gray background. This specimen
386. 48- Paralichthys albiguttus, 12 cm long, fully adapted to a very light gray background. This specimen continuously appeared somewhat darker than the background. Note that the three ocelli have almost entirely disappeared. 49- Individual (B)..., on black and white background (dots 0.5 mm. in diameter).... Dots of this size, no matter how numerous, had no effect except perhaps to cause the skin to become uniformly slightly grayer. 50- Individual (B) on black and white background (dots 1 mm in diameter)...after having been fully adapted to 1 cm. squares. These spots have no appreciable effect on the skin unless they are more numerous than they are in this background. 51- Individual (B) on black and white background (dots 1 mm. in diameter)....after having been fully adapted to dots 2 mm. in diameter. Note that the posterior ocellus is much darker than on white, but that the two anterior ones are not....
21- Paralichthys albiguttus, 16 cm long, in shallow bluish-gray mottled granite pan.... Excellend simulation
387. 21- Paralichthys albiguttus, 16 cm long, in shallow bluish-gray mottled granite pan.... Excellend simulation of the background on the entire surface except the three ocelli, which are nearly black. 22- Same specimen photographed in the granite pan....very shortly after mechanical stimulation. Note the contrast due to the enlargement of the regions around the ocelli and the appearance of numerous dark and light spots. These regions and spots were considerably more pronounced immediately after stimulation. They become less conspicuous rapidly but it usually requires several minutes for them to disappear completely. They usually also appear when the animal is feeding.
King Salmon: Variotions in the form of the myomeres are shown in this figure of the left side on Oncorhynchus
388. King Salmon: Variotions in the form of the myomeres are shown in this figure of the left side on Oncorhynchus tschawytscha. The superficial markings of the myomeres and of the myocommata are indicated. There is some little variation, but of no great significance, at the level where the superficialis and the profundus join. It was deemed to detract from the significance of this figure to indicate this separating line.... The cephalic myocommata are attached to the base of the skull--to the occipital, temporal and pterotic bones. They are not interrupted by the clavicle, which lies lightly embedded on the surface. The complexity of folding and the lingitudinal extent of the myomeres increases posteriorly. The most important variation is due to the division of the anterior fold into two slender cones in the caudal half of the body
Coloration of the Crab in Molting Stages
389. Coloration of the Crab in Molting Stages
Ventral view of adult male crab showing copulatory organs
390. Ventral view of adult male crab showing copulatory organs
Ventral view of adult male crab
391. Ventral view of adult male crab
Dorsal view of adult female crab
392. Dorsal view of adult female crab
Floats secured within an enclosure of wire supported on posts to prevent disturbance by boats
393. Floats secured within an enclosure of wire supported on posts to prevent disturbance by boats
Photograph of female crab upon whose swimmerets remnants of an old sponge were found, thus showing that
394. Photograph of female crab upon whose swimmerets remnants of an old sponge were found, thus showing that the individual had spawned. This crab was taken with the dredge of February 28, 1917, in Chesapeake Bay. Note large, full appearance of ovaries, O, which are filled with mature eggs; L, digestive gland
Ventral view of adult female crab showing swimmerets. A, inner swimmerets to which the eggs are attached;
395. Ventral view of adult female crab showing swimmerets. A, inner swimmerets to which the eggs are attached; B, external openings of oviducts
Ventral view of adult female crab, with broad abdomen
396. Ventral view of adult female crab, with broad abdomen
"Valdavia" nach Beendigung der Anterfuchungen auf der Beede von Aden vor Unter liegend
397. "Valdavia" nach Beendigung der Anterfuchungen auf der Beede von Aden vor Unter liegend
Pelagische Tiefseefische mit Telefopangen Winteria telescope, Gigantura, Opisthoproectus, Argyropelegus
398. Pelagische Tiefseefische mit Telefopangen
Winteria telescope, Gigantura, Opisthoproectus, Argyropelegus
Gigantactis Vanhoefieni n. gen. n. sp. Brauer
399. Gigantactis Vanhoefieni n. gen. n. sp. Brauer
Glyphocrangon spinulosa Faxon
400. Glyphocrangon spinulosa Faxon
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results 381-400 of 21042 item(s)  page 20 of 1053 : ( <<  11  12  13  14  15  16  17  18  19  20  >> ) :: previous : next
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