BOSTON 
E 
JOURNAL OF NATURAL HISTORY. 
UARY, 1839. 
ART. en ON THE FAMILY OSTEODES- 
MAGEA ‘OF DESHAYES, WITH REMARKS ON TWO 
SPECIES OF PATELLOIDEA, AND DESCRIPTIONS OF 
NEW SPECIES OF MARINE SHELLS, A SPECIES OF 
ANCULOTUS, AND ONE OF — By Josren P. Cov- 
THovr. Read June 30, and Aug. 1, r, 
GENERIC CHARACTERS. Shell thin, transversely 
oval, inequivalve, corbuliform, right valve the “more 
convex, inequilateral, slightly gaping .at both ex- 
tremities ; beaks well mi ed, and incited a little 
backwards ; hinge basing et 3 S a more 
* 
Genus Tunacia, Leach. 
also externally ; ; this internal sign (s 2 
posteriorly attached to, and ` ly süpports a cylin- 
drical ossiculum, in the form of a semicircle. Anterior 
muscular impression narrow and elongated, united to the 
posterior, which is small and rounded, by a n im- 
pression strongly excavated PNE 
VOL. III.—NO. II. 
