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Figures illustrating the tubes in which Lingula anatifera lives. The upper figure is a view of the trilobed opening of the tube. The lower figure shows the tube in the sand laid open and the animal exposed. The dotted line indicates the position of the body when retrcted. The darker portion is the tube of sand agglutinated by the secretion of the stalk.
Specimen of Helix rosacea Mull., Cape of Good Hope, into which a piece of grass has by some means become introduced. The animal has protected itself by covering the grass with a shelly layer
Siphonaria gigas Sowb., Panama, the animal contactracted in spirit; gr, siphonal groove on right side (A)
Gadinia peruviana, Sowb., Chili, shell only; gr, mark of siphoid groove to right of head
Example of a heteropod, Carinaria mediterranea Lam., Naples; a, anus; br, branchia; f, food; i, intestine; m, mouth; p, penis; s, sucker; sh, shell; t, tentacles. Animal swims foot uppermost
Photograph taken from a model in the Museum of Natural History in New York. The different portions of the anatomy are indicated by the labels. The sympol A. A. and P. A. refer to the anterior and posterior adductor muscles, which hold the two valves of the shell together. The posterior part of the animal is represented by the siphon, which consists of two parts, an incurrent and an excurrent, through which the water enters and leaves the quahaug in the directions indicated by the arrows. In the mantle chamber the food is filtered from the water by the gills, which are here shown cut off near their base.
1 millimeter in size, half buried in the sand. The animal is feeding, water passing in and out of the extended siphon, as shown by the arrows.
1 millimeter (1/25 inch) in length, attached to sand grains by the byssus (B). The ssipphon (S) consists of two parts, an incurrent encircle dby twelve tentacles, through which the water enters the mantle chamber of the animal, and an excurrent with four tentacles and filmy telescopic tube through which the water passes out of the mantle cavity. The byssus areises from a gland on the under side of the foot (ft).
Fig.15.--Ciliated gastrula, ten hours after fecundation. The embryo Can now swim through the water by means of hairlike cilia. The larger cells have become invaginated.
Fig.16.--Trochosphere stage, twelve to fourteen hours after fecundation. The body has elongated and the cilia are now confined to the front end. The opening of the primitive mouth (pm) cn be seen on the lower side, while above is a slight indentation corresponding to the eginning of the shell gland (sg).
Fig.17.--Formation of the shell, which arises at two symmetrical points of calcification, right and left of the median line, and gradually envelops the animal.
Fig.18.--Early veliger swimmer with velum extended from the shell, about thirty-six hours after fecundation. aa, anterior adductor muscle, pa, posterior adductor muscle, s, stomach, a, anus, mt, mouth, v, velum.
Fig.19.--Veliger slightly older than shown in Fig.18. The intesting (i) has elongated, and the liver (l) is more prominent.
Reconstruction of Cymbospondylus petrinus, the characteristic ichthyosaur, or fire-lizard, of the middle triassic limestones in the West Humboldt Range, Nevada. Length in life approximately thirty feet. This animal was a reptile specialized for life in the sea
Views of the under sides of the heads of adult females of the common sturgeon, showing the relative position of the barbels and mouth, with its undistorted fleshy marginal processes as seen in the recently killed animal (fig.35-36); View of the under side of the head of an adult male of the common sturgeon, showing the aerolation on the under side of the snout in front of the mouth, the areolae being sensory tactile areas supplied by the fifth nerve.
Diagrammatic figure of oyster lying in left valve of shell and dissected to show internal organs, (after Leuckart and Nitsche); a, mouth; b, stomach; c c c, intestines; d, anus; g, gills by which the animal 'breathes'; f f f, edge of mantle lobe; e e e, shell; h, abductor muscle by which the two valves of the shell are closed; i, nerve; k k, kidney; l, labial palps or mouth plates; n n, liver; o o o, ovary; p, heart in pericardisl space; r, nerve of edge of mantle
Ptenoplax notopus, the Flat-backed Feather-crab, from the Bay of Bengal, 100-250 fathoms. The eyes are almost rudimentary, probably as a consequence of living in deep and turbid water. The legs, especially the small and modified fifth pair, are reathered, perhaps for swimming, but probably for supporting the animal on a soft, yielding, muddy bottom
Certain Convocation of Politic Worms and Corals
Heteropsammia aphrodes, from off the Ganjam coast, 20-25 fathoms. The left-hand figure shows the base of the coral, with the opening for the messmate worm; the right-hand figure gives a view of the interior of the cup of the coral. Both figures, or course, represent merely the skeleton of the coral, from which the animal has been removed by maceration....
Good Case of Protective Resemblance
Parthenope investigatoris, an Oxyrhynch crab that lives among coarse coral shingle, and is itself so scored and pitted as to resemble a piece of worm-eaten coral. The last pair of legs has been accidentally broken off, and the animal is snown in a conventional attitude
Local distribution of the gastropod mollusk Tritia trivittata. This species was recorded from 353 stations out of the total of 417 comprised within the limits of the map. It has thus the most general distribution of any species of animal dredged within these waters
The circle around the star, here and elsewhere among the mollusks, denotes the known occurrence of living specimens. Where the circle is wanting, either dead shells only were present or the point is not indicated in the records. The symbol has, however, been employed only in the case of shell-bearing animals
Pleurotoma symbiotes, with its commensal zoophytes (Eipzoanthus), from off Cape Comorin, 1043 fathoms. This animal, unlike other Indfian Pleurotomas, has never been taken without a crust of these sea-anemones
Rhytina, or Sea-Cow (Extinct) : The flesh of this animal constituted the chief food supply of Bering's shipwrecked crew. 1741-42
Herd of elk has increased in a few years in this pasture more than two hundred per cent. Strict observance of the law on elk will in the course of time restock the state with this magnificent animal
Antelope--a rapidly disappearing game animal. Its habitat is the high plateaus of Southeastern Oregon, where it is an easy prey to the raiders along the border. Some adequate protection should be afforded this rarest of game animals, in the hope that it will increase and multiply
Reconstruction of Cymbospondylus petrinus, the characteristic ichthyosaur, or fire-lizard, of the middle triassic limestones in the West Humboldt Range, Nevada. Length in life approximately thirty feet. This animal was a reptile specialized for life in th
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