. Bulletins of American paleontology. 22 Bulletin 95 22 and bears nine small tufts of silvery bristles, evenly spaced, on each side, and a sparse beard of bristle on each end. This chiton is usually found in shallow water, adhering to dead shells, or crawling in sand near shore line, an unusual habit for a member of this group. dorsal border HgameJital area posterior lateral teeth lunular area — cardinal teeth anterior adductor tear anterior border — yallwl li. — posterior adductor scar -posterior border — pallial sinus -— ventral border Fig. i. Diagram showing the characteristic features of a
. Bulletins of American paleontology. 22 Bulletin 95 22 and bears nine small tufts of silvery bristles, evenly spaced, on each side, and a sparse beard of bristle on each end. This chiton is usually found in shallow water, adhering to dead shells, or crawling in sand near shore line, an unusual habit for a member of this group. dorsal border HgameJital area posterior lateral teeth lunular area — cardinal teeth anterior adductor tear anterior border — yallwl li. — posterior adductor scar -posterior border — pallial sinus -— ventral border Fig. i. Diagram showing the characteristic features of a pelecypod Class PELECYPODA The class Pelecypoda (Gr., pelekys, axe; podos, foot) is in- ferior to the Gasteropoda in numbers of genera and species, but in numbers of individuals it surpasses all other divisions of the Mol- lusca. Along parts of the North Atlantic Coast where Mya aren- aria finds congenial circumstances, the littoral area may be almost paved with successive generations of this bivalve mollusc. On the Gulf beach of Sanibel Island, Florida, wind and tide pile up great banks of shells which consist preponderatingly of Noctia ponder- osa, and from time to time incredible numbers of young Chione cancellata are washed ashore. Less frequently living Barnca cos- tata are stranded on the beach by hundreds when some unusual tidal current has undermined a colony of them. Pelecypoda are without distinct heads and the organs of special sense are not highly developed. The mantle conforms to the shape of the shell. It covers the viscera and contains between its. 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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