Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 hinge PECTUNCULrs (fig. 98), the is curved, and the shell is lenticu lar in form. The first are met with near the shore in rocky situations, and are ordinarily covered by a hairy epidermis; the latter live in the mud. 20. Finally, the Trigoni^, most of the species of which are fossil, are remarkable for their peculiar hinge; the right valve is furnished with two projecting plates, crenulate Fig. 98. •PECTUNCULUS. 18. What are the characters of the genus P
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 hinge PECTUNCULrs (fig. 98), the is curved, and the shell is lenticu lar in form. The first are met with near the shore in rocky situations, and are ordinarily covered by a hairy epidermis; the latter live in the mud. 20. Finally, the Trigoni^, most of the species of which are fossil, are remarkable for their peculiar hinge; the right valve is furnished with two projecting plates, crenulate Fig. 98. •PECTUNCULUS. 18. What are the characters of the genus Pi'nna? (Pinna, Latin, x fin.) 19. What are the characters of the genus Arca ? What are the charac- ters of the genus Pectu'nculus ? (Pectunculus, Latin, the diminutive of pecteriy a comb.) 20. What is Trigo'nia ? (From the Greek, trigonosy having three cor- ners.)
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