ASTARTID^. 229 



LuTETiA, Desha^'es, 1860. 



Distr. — 2 sp. Fossil. Paris Basin. L. Pat^isiensis, Desb. 

 (cxxi, 24). 



Shell small, orbiculai*, globose, equivalve ; valves closed ; border 

 simple and entire ;■ hinge narrow ; cardinal teeth three in each 

 valve, two diverging; the third large and obliquel}'^ placed 

 between the others ; mnscular scars small, oval, submarginal, 

 equal ; pallial line simple ; ligament external. 



MiCROMERis, Conrad, 1866. 



Syn. — Pteromeris, Conr., 1865. 



Distr. — Eocene; Alabama. M. minutissima, Ijea (cxxi, 25). 



Shell trigonal, with produced, somewhat attenuated, rather 

 straight beaks, ventrally rounded, slightly inflated, striated or 

 sulcated on the surface ; the hinge appears to have two small 

 cardinal teeth in the left valve and one in the right, and one long- 

 posterior lateral tooth in each. 



WooDiA, Deshaj^es, 1860. 



Etym. — Dedicated to Searles Y. Wood, a distinguished palfe- 

 ontologist of England. Syn. — Digitaria, Wood. 



Distr. — 1 recent sp. Mediterranean ; also fossil in the Tertiary. 

 W. marginalis, Desh. (cxxi, 26). 



Shell small, rounded, equivalve, equilateral; valves closed, 

 smooth, or ornamented with oblique, curved strise; hinge thick; 

 right valve with a single, large, median, triangular tooth, de- 

 pressed or channeled in the middle ; left valve with two narrow, 

 unequal, diverging teeth; lateral tooth wanting or rudimentary; 

 ligament internal, small ; muscular scars small, equal, oval or 

 ovate ; pallial line simple. 



Blathia, Issel. 



Distr. — E. Arconatii.1 Issel (cxxi, 2t, 28). Red Sea. 



Shell ovately elongated, much compressed, inequilateral, ante- 

 riorly much shorter ; concentrically striated ; umbones very small, 

 curved in ; lunule small, deep ; hinge with a single, large, elon- 

 gated cardinal tooth in each valve. 



In form it resembles Goodallia, but also exhibits considerable 

 relation to some of the elongated forms of Loripes. 



EuLOXA, Conrad, 1864. 



Distr. — E. latisulcata., Conx. (isxxi, 16, 17). Miocene; U.S. 



Shell like Astarte, somewhat produced posteriori}^, hinge 

 apparently with three cardinal teeth in the left valve, the two 

 teeth on the sides being much smaller than the median one, and 

 two teeth in the right valve. 



