What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
according altogether animal anterior anus aperture appears appendages arms articulated attached base bivalves body branches calcareous called canal cause cavity certain close coasts colour common completely composed considerable considered contained covered direction distinct distinguished divided division edge eggs elongated entire envelope equally evidently exist extended external extremity eyes fact Finally fixed followed foot four frequently furnished genera genus gills greater head individuals inhabit interior internal intestinal issue known length less live manner mantle margin mass matter means middle mollusca mouth muscles muscular nature nearly observed organs orifice oysters polypi position posterior present pretty probable produced projecting relation remarkable resembles round seen separated serve shell side similar simple skin sometimes sort species spire substance surface takes tentacula terminated thick true tubes usually valves whorl
Page 114 - Have the mantle open at the anterior extremity, or near the middle only, for the passage of the foot, and extended from the other end into a double tube, which projects from the shell, whose extremities are always gaping. Nearly all of them live buried in sand, stones, ooze, or wood. Those of the genus
Page 39 - There are four stomachs, the second of which is fleshy, and sometimes armed with bony appendages, and the third furnished internally with salient longitudinal laminae; the intestine is short. Various species inhabit both the Mediterranean and the Atlantic, some of which are large, and marked with the most beautiful
Page 28 - to as a proof that the muscles of the animal can be detached from the shell; for, at a particular epoch, of all the whorls of the spire originally possessed by this bulimus, not a single one remains.
Page 132 - attached to various bodies, the aperture of which is more or less closed by two or four valves. This tube is formed of various pieces which appear to be detached and separated, in proportion as the growth of the animal requires it. The
Page 83 - or little pyramids forming a cordon, more or less complete, under the borders of the mantle, very nearly as in the inferobranchiata, from which they are distinguished by the nature of their hermaphroditism; for,
Page 45 - by their foot, which, instead of forming a horizontal disk, is compressed into a vertical muscular lamina, which they use as a fin, and on the edge of which, in several species, is a dilatation forming a hollow cone, that represents the disk of the other orders. Their
Page 49 - or strips, laid parallel with each other, like the teeth of a comb, are attached on one, two, or three lines, according to the genus, to the ceiling of the pulmonary cavity, which occupies the last whorl of the shell, and which has a large opening between the edge of the mantle and the body. In two genera only, Cyclostoma and Helicina, do we find, instead of