Report on the Invertebrata of MassachusettsWright and Potter, state printers, 1870 - 524 էջ Tunicata -- Conchifera -- Brachiopoda -- Gasteropoda: Opithobranchiata ; Prosobranchiata ; Pulmonifera -- Pteropoda -- Cephalapoda. |
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Common terms and phrases
Acad acute ADAMS angle animal aperture apex beaks BINNEY body body whorl Bost branchiæ branchial breadth Brit broad callus Cape Cod Casco Bay Check Lists CHEMNITZ chestnut colored columella compressed Conch convex curved deep DESHAYES distinct dorsal Eastport edge elevated elongated Encyc England epidermis flattened folds foot Genus GOULD Grand Manan groove half height Helix hinge hinge-margin Hist horn color inch Journ LAMARCK length ligament lines of growth mantle margin Mighels minute N. Y. Moll narrow nearly numerous oblique obtuse operculum orifice outer lip oval ovate papillæ peristome PFEIFFER posterior posteriorly Proc prominent revolving lines ribs ridges rounded Sable Island Shell small side slightly smooth SOWERBY species specimens spire STIMPSON striæ sub-oval surface suture Syst teeth tentacles tenths terminating Terr thick thin tooth transverse triangular truncated umbilicus valve whorls five whorls four Willis wrinkled yellowish Zool
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Էջ 234 - The tuberosities of the surface are more prominent in proportion to their size, are not flattened or plate-like, and are not separated by darker colored anastomosing lines, the intervening furrows being of the same color as the general surface.
Էջ 67 - Shell solid very oblique, trigonal, triangular, subequilateral, very much drawn up in the region of the beaks, inflated in adult ; anterior side a little longer, narrower, produced at the end; posterior broader, subtruncate; beaks placed a little posteriorly, small, raised, with a wing-shaped appendage on the summits, distant; striae distinct, regular; epidermis very variable, yellow, gray or chestnut color; valves solid varying in inflation, interior light blue ; hinge thick ; cardinal teeth small,...
Էջ 233 - ... on the posterior part, and its edges free throughout the whole circumference. Upper surface of the body marked with longitudinal lines, or shallow furrows, darker than the general surface, sometimes black, anastomosing with each other, and forming a sort of net-work ; between the reticulated lines are narrow, irregular oblong plates, or smooth, flattened tubercles, giving the surface the appearance of a mosaic work, with lines of dark cement ; reticulations less distinct on the sides, and disappearing...
Էջ 265 - ... of the back and one on each flank, extending from the head to the posterior extremity, anastomosing more or less with each other, and having smaller spots of the same color between them; inferior margin white or yellowish; foot whitish. Mouth surrounded with a circular row of papillae. Body elongated, subcylindrical, flattened towards its posterior extremity, which is obtuse; eye-peduncles...
Էջ 301 - Their usual mode of swimming is by dilating their sack-shaped body and filling it with water. The body is then suddenly contracted and the water forcibly ejected, so as to propel them backwards with great rapidity. So swift and straight is their progress that they look like arrows shooting through the water. Whenever they strike the shore they commence pumping the water with increased violence, while every effort only tends to throw them still further upon the sand, until they are left high and dry....
Էջ 234 - ... lines; back covered with prominent elongated tubercles and furrows; foot narrow, whitish; respiratory foramen on the posterior dextral margin of the mantle; body covered with a thin, watery mucus.
Էջ 298 - ... remain long, and after ten o'clock at night were rarely met with. He succeeded only once in finding a few isolated specimens during the heat of the day ; while at full tide, soon after dark, they were very often found in abundance. These animals are very easily kept in captivity, and their habits, which can then be carefully watched, may explain, in a very satisfactory manner, their sudden appearance and disappearance. As was already previously known, these animals can creep about by means of...
Էջ 273 - The foot is short, thick, distinctly divided into two segments.1 the anterior of which is bilobcd, and projects, when the animal is in motion, considerably in advance of the head. Eyes oval, situated on the back, near the base of the tentacles. Its motions are very sluggish. It carries the shell directed horizontally ; the shell is so transparent that the viscera of the animal may be seen through it.
Էջ 298 - ... captivity, it was noticed that they but rarely , left the bottom during the day, merely rising a few inches and then falling down again to the bottom of the jar. After dark, however, they could all be seen in great activity, moving near the surface of the water as fast as their appendages enabled them. During the day they often remain suspended for hours in the water simply by spreading their wing-like appendages, and then suddenly drop to the bottom on folding them.
Էջ 267 - Gray, with a line of minute black dots along each side. g. Blackish-gray, with black lines along each side, and an indistinct line down the middle of the back. The appearance of the surface of the mantle is constantly changing, from the play of light on its lubricated eye-peduncles, tentacles, and furrows, which are in almost ceaseless motion. There can be no doubt that this is the animal originally described by...