MANUAL OF THE MOLLUSCA. 
CYPRIMERIA, Conrad, 1864. 
Type, Cytherea excayata, Morton. Cretaceous. North 
America, 
Shell lentiform; hinge of right valve broad, with a bifid 
oblique cardinal tooth and two oblique acute anterior teeth, 
with an intermediate pit for the reception of the tooth in the 
opposite valve. 
DosINIOPsIs, Conrad, 1864. 
Derivation, Dosinia, a generic name, and opsis, like. 
Type, D. Meekii. Eocene. United States. 
Shell exteriorly like Dosinia. Cardinal teeth three in each 
valve; posterior tooth of right valve bifid; in the left valve, 
a thick rugose lateral tooth fitting into a cayity in the opposite 
valve; under the umbo is a pit; cartilage plate granulated; 
pallial sinus deep and angular. 
Distribution, 3 species. Hocene. United States. 
CoNCHOCELE, Gabb. 
Type, C. disjuncta, Gabb. Miocene? California. 
Shell irregularly quadrate, very inequilateral, angulated pos- 
teriorly ; presenting some analogies to Hdmondia, Unicardium, 
and Cardiomorpha. Ligament external; hinge with a long, 
sharp tooth running from the beaks parallel with the cardinal - 
margin, almost to the posterior end; pallial line simple. 
AsTARTE. Subgenus, Astartella, Hall and Whitney, 1858. 
A. vera. Coal Measures. Illinois and Indiana. The anterior 
tooth of the right valve has a longitudinal pit in the summit. 
[Famity CARDITZ. | 
WooptA, Deshayes, 1860. 
Dedicated to Searles V. Wood, a distinguished paleontologist 
of England. 
Example, Tellina digitaria, Linné. 
Shell small, rounded, equivalve, equilateral; valves closed, 
smooth, or ornamented with oblique, curved strize; hinge thick; 
right valve with a single, large, median, triangular tooth, de- 
pressed or channelled in the middle; left valve with two narrow, 
unequal, diverging teeth; lateral tooth wanting or rudimentary. 
Ligament internal, small; muscular scars small, equal, oyal or 
ovate; pallial line simple. 
Distribution, 1 species. Mediterranean; also fossil in the 
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