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acute Animal aperture appear Audubon band base beneath bird body Boston breeding brown called characters color common considerable considered convex covered dark deep described diameter distinct DISTRIBUTION dorsal edge eggs England epidermis extending extremity feet fish five four genus Greatest green habits half head Helix Hist Hook inch insects known labro larger lateral leaves length less Lichen lower margin marked Massachusetts minute Mountains narrow Natural nearly nest noticed observed Ohio outer pass plant plates posterior present probably prominent PUPA rays REFERENCES reflected regions REMARKS resembles river rounded scales seems seen shell side slightly sometimes species specimens spring striæ surface tail teeth tooth transverse trees umbilicus upper variety whorls winter woods yellow young
Seite 414 - Shell perforated, subpyramidal; epidermis yellowish horn color; whorls six or seven, with numerous fine, oblique striae and very minute, spiral striae, intersecting each other; outer whorl with a narrow, light-colored band and an ill-defined, brownish band below it; aperture rounded, a little transverse; peristome thin, somewhat thickened within by a deposition of testaceous matter, its columellar extremity slightly reflected at its junction with the base of the shell; perforation small, sometimes...
Seite 380 - M. albolabris, Say ; they were white, adhering together very slightly, flaccid, and apparently not entirely filled with fluid. During the succeeding night the number had increased to about fifty, and in a few hours they became full and distended. As the snail now began to devour the eggs, he was obliged to remove it. On the 29th of July all the eggs were hatched...
Seite 381 - The young snails had li whorls; the umbilicus was open; the head, eye-peduncles, and tentacles were bluish-black,' and the other parts whitish and semi-transparent. They immediately began to feed, and made their first repast of the pellicle of the eggs from which they had just emerged. They grew rapidly, and before the middle of October, when they went into winter quarters, they had increased their bulk four or five times beyond its original measurement. Jaw as usual in the genus; 15 ribs.
Seite 420 - Shell depressed; epidermis yellowish horn color, smooth, shining, with very minute lines, not breaking the smoothness of the surface; whorls five; suture not much impressed; aperture transverse, scarcely oblique, obliquely lunar, with a thick, white testaceous deposit around its whole inner surface, a little distant from the margin; peristome thin, acute, fragile, its ends somewhat converging, the columellar margin reaching to the center of the base, subdilated above; umbilicus small; base rather...
Seite 430 - The collar is deeply tinged with the coloring matter which ornaments the shell, and which is sometimes secreted in such profusion, as to give a saffron tinge to the trace which it leaves on objects over which it crawls. It is distributed over the animal, and arranged in minute points, which are most thickly clustered on the margin, and on the glandular tubercles of the surface.
Seite 497 - Scction 4. Honorary members shall be selected from persons eminent for their attainments in science on whom the society may wish to confer a compliment of respect, and shall have all the privileges of regular members except those of voting and holding office. They shall not exceed forty (40) in number, not to exceed twenty (20) of whom shall be residents and citizens of the United States. Honorary members shall be elected only at the annual meeting. Section 5.
Seite 379 - ... open, deep, not wide, exhibiting all the volutions, slightly contracted by the reflected lip ; base rounded, with the striae distinct, converging into the umbilicus.
Seite 434 - Ward. Plate 4, fig. 16. Shell widely umbilicated, small, depressed, thin; epidermis whitish, immaculate; suture distinctly impressed; whorls more than four, convex, with very fine, oblique, parallel s-triae, which become obsolete on the base; aperture oblique...
Seite 373 - ... peristome subreflected at its columellar extremity, simple above, and in some specimens considerably depressed near its junction with the outer whorl; columella with a thin callus, the edge of which connects the upper and lower extremities of the peristome.
Seite 415 - ... the umbilicus and the shape of the aperture are the same in both. But the principal distinction consists in the spiral lines which revolve on the whorl, intersecting the striae of growth, but so minute as hardly to be perceptible to the naked eye, yet present in every specimen which I have examined.