Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 is always uncovered. The mouth is armed with a trunk, and there is generally a small horny operculum. ^ 3. The BucciNUM properly so called '-' {Jig. 57), has an oval, elongated shell, the aperture of which is oval, nolched, and with- out a canal. The operculum is complete, and these animals have no veil on the head like the Cerita, A great many species are known, Lamarck describes fifty-eight species. 4. We give the name of Nassa to mollusks that ditfer very
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 is always uncovered. The mouth is armed with a trunk, and there is generally a small horny operculum. ^ 3. The BucciNUM properly so called '-' {Jig. 57), has an oval, elongated shell, the aperture of which is oval, nolched, and with- out a canal. The operculum is complete, and these animals have no veil on the head like the Cerita, A great many species are known, Lamarck describes fifty-eight species. 4. We give the name of Nassa to mollusks that ditfer very little from the preceding, but in which the columella of the shell, in place of being Fig. 57. convex and naked, is covered by buccinum undatum. a plate of greater or less thickness {Jig. 58). Dolium also belongs to this tribe, and is remarkable for the length of its trunk and the size of its foot. It is without operculum, and the shell is recognised by being almost globose, very ventricose and fur- nished with projecting ribs, which follow the direction of the whorls of the spire, and make the margin of the aperture un- dulated {fig. 59). A very large species is found in the Mediterranean. d
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