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1.
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
2.
Cross-section of a ventral phosphorescent organ of the Midshipman, Porichthys notatus Girard. l, lens; gl, gland; r, reflector; bl, blood, p, pigment
3.
Patella vulgata L., seen from the dorsal side after the removal of the shell and the black pigment covering the integument; the anterior portion of the mantle is cut away or turned back
4.
Aulopyge hugelii: Lateral line and skin, showing pigment spots
5.
Squeteague : The...right side of a specimen 120 mm. long taken at Wareham, August 22...The streaking which is conspicuous in the adult is here still obscured by the general distribution of pigment in the deeper layer shown...which represents the coloration of the right side after the removal of the skin
6.
Squeteague : Right side...with the outer skin removed and showing the bars made less distinct than in younger specimens by the appearance of numerous color cells between them. No evidence of oblique streaking which is entirely due to color cells in the outer layer of the skin. The blood vessels are surrounded by pigment cells and show as black lines
7.
Apeltes quadracus (Four-spined Stickleback)
Fig.22 Embryo in the egg, showing the asymmetrically disposed vitelline vessels; figs. 23 & 24 Other views of the same stage, showing the lateral position of the heart; Fig.25 Dorsal view of a recently hatched embryo, showing the distribution of the brown pigment blotches on the median line and the symmetry in the distribution of the vascular channels on the dorsal side of the yelk; Fig.26 Side view of the same stage, showing the pigmentation and vascular loops in the dorsal fin-fold
8.
Solea variegata : Larva of Thickback Newly hatched, April 24, 1889... Pigment as seen by reflected light. yk: yolk (1); Solea variegata : Larva...two days after hatching, April 23, 1889... Pt, pectoral fin; ht, heart (2); Pleuronectes flesus : Larva of flounder (Pleuronectes flesus) two days after hatching, February 20, 1889, from egg artificially fertilised (3); Pleuronectes flesus : Larva...six days after hatching, February 24, 1889...; same magnification (4); Pleuronectes flesus : Young flounder taken in Mevagissey Harbour, April 2, 1889; drawn April 5.... (5)
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