Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 Fig. 61. CASSIS. Fig. 62. 7. The Helmet — Cassis {Jigs. 34, 61, 62) — also very much resembles the ordinary Buccinum; but their shell, which is ovate, with a short, slightly projecting spire, is furnished with a transversely wrinkled plate, covering the columella, like the Nassa. The aperture, sometimes oblong, sometimes straight, is also wrinkled externally, and its notch termi- nates in a little short canal which is curved backwards. 6. The Terebra differs
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 Fig. 61. CASSIS. Fig. 62. 7. The Helmet — Cassis {Jigs. 34, 61, 62) — also very much resembles the ordinary Buccinum; but their shell, which is ovate, with a short, slightly projecting spire, is furnished with a transversely wrinkled plate, covering the columella, like the Nassa. The aperture, sometimes oblong, sometimes straight, is also wrinkled externally, and its notch termi- nates in a little short canal which is curved backwards. 6. The Terebra differs still less from the Buccinum properly so called : it is distin- guished from it only by the elongation of its spire. 9. The Cerithium (fg. 63), the shell of which is turreted, like that of the Terebra, but furnished with a short canal curved to the left or backwards, also differs from other Buccina by having a veil above the head : this animal has but a single branchia. Some of the mol- lusks of this genus inhabit the sea, and others fresh water. A great many living species are known; but they were formerly more abun- Fig. 63. CERITHIUM ALUCO. 7. What are the characters of the genus Cassis? (Cassis, Latin, a helmet.) 8. How is Terebra distinguished from Buc'cinum ? (Buccinum, Latin, a trumpet, a shell-fish.) 9. What are the characters of Cerithium ?
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