Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 STRUCTURE OF THE TURBO PICA. 43 from the shape of the opening, resembling a human ear. Many of these gasteropods are of considerable size. One species is found on the shores of the Mediterranean. ORDER OF PECTZKIBRANCHIATA.'^ 26. This division of the class of Gasteropods is the most numerous in genera and species : it comprises nearly all the mollusca, in which the shell is univalve and spirally twisted, m vh h ah ov Fig. 32.—ANATOMY ov A PECTiNiBRANCH GA
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 STRUCTURE OF THE TURBO PICA. 43 from the shape of the opening, resembling a human ear. Many of these gasteropods are of considerable size. One species is found on the shores of the Mediterranean. ORDER OF PECTZKIBRANCHIATA.'^ 26. This division of the class of Gasteropods is the most numerous in genera and species : it comprises nearly all the mollusca, in which the shell is univalve and spirally twisted, m vh h ah ov Fig. 32.—ANATOMY ov A PECTiNiBRANCH GASTEROPOD. Turho Pictt {See Jig. 44). Explanation of Fig. 32.—Anatomy of a pectinibranch gasteropod (the Turho pica), to show the arrangement of the respiratory cavity :—p. the foot of the animal;—o. the operculum ;—t. the trunk;—la. the'tentacles ;—y. the eyes ;—/n. the mantle, split open longitudinally so as to expose the respi- ratory cavity :—-/. the anterior edge of the mantle, vi^hich in its natural po- sition covers the back of the animal, and leaves there an opening or great slit, through which the water reaches the branchiae ;—h. the branchiae :—vb. the branchial vein which goes to the heart (c);—ah. the branchial artery ;— a. the anus;—i. the intestine ;—e. the stomach and liver;—ov. the oviduct. Above the nucha or nape, we see the cephalic (nervous) ganglion, and the salivary glands ;—d. fringed membrane, which below borders the left side of the opening of the respiratory cavity. * Pec'tinibranchia'ta.—From the Latin, peclen, a comb, and branchia^ gills ; because the branchiae or gills {Jig. 32, b) resemble a comb in form. 26. What are the peculiarities of the pectinibranch ga'steropods what parts of the shell do we find the respiratory cavity ? In
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