. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. 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
. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. 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.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ruschenberger, W. S. W. (William Samuel Waithman), 1807-1895; Comté, Achille, 1802-1866; Milne-Edwards, H. (Henri), 1800-1885. Philadelphia : Grigg & Elliot
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectmollusks, bookyear184
