CLASS PELECYPODA 
145 
Type in Cuming Coll., British Museum. Type locality, Gulf of Cali¬ 
fornia. 
Range. San Diego, California, to Panama. In the Pleistocene at 
San Pedro and San Diego, California. 
Cardium substriatum Conrad, 1837. 
Jour. Acad. Nat. Sci., 7:228; pi. 17, fig. 2. 
Shell obliquely ovate, ventricose, thin, smooth; radiating striae obso¬ 
lete, except on the inferior part of the umbonal slope; color yellowish, 
variegated with brown umbo and middle of disk tinged with blue; within 
yellow, varied with brownish purple markings; margin finely serrate. 
(Conrad.) 
Type locality, San Diego. 
Range. Catalina Island and San Pedro, California, to Acapulco, 
Mexico. In the Pleistocene at Santa Barbara, San Pedro, and San Diego 
Well, California. 
Genus SERRIPES Beck, 1841. 
Shell subcordiform, compressed, subequilateral; surface smooth or 
slightly radiately striate; beaks prominent; cardinal and lateral teeth 
obtuse, small, almost obsolete. (Tryon. S. S. Conch.) 
Type. Serripes grocnlandicus Gmelin. 
Distribution. Arctic Seas. 
Serripes groenlandicus Gmelin, 1792. 
Plate 8, fig. 3. 
Syst. Nat., 7:3232, Binney and Gould, Invert. Mass.; p. 145; fig. 454. 
Cardium groenlandicum, testa cordata, kevi, antice et postice longitu- 
dinaliter subtilissime striata, margine exteriore integerrimo. Habitus 
Veneris sed Cardo Cardii. (Gmelin.) 
Shell large, subtriangular, drab colored, with very numerous, obsolete 
radiating ridges; slightly gaping posteriorly, beaks slightly prominent, 
incurved; margins within salmon colored, center opaline. Length, 2^ 
inches; height 2% 0 inches; breadth, 1% inches. (Invert. Mass.) 
Type in Museum Cuming. Type locality, Coast of Greenland. 
Range. Arctic to Puget Sound. Also Atlantic and Japan. 
Serripes laperousii Deshayes, 1839. 
Rev. Zool. Soc. Cuvierenne, p. 360. Guerin, Mag. de Zool., Moll.; pi. 48, 1841. 
Testa ovata-transversa subiequilatera, turgidula, transversim irregu- 
lariter striata, marginibus intergris, postice hiantibus, cadine edentulo, 
umbonibus oppositis, ligamento pradongo solido. (Deshayes.) 
