l.SO CAMFOKNIA ACAOKMY l)K ScniCNCKS. 



132. Cryptoraya californica I'mirail. 



Splia-iiia californica CoN., Joiirn. I'liil. Acad. N.it. Sci., Wil. \'ll, 1S37, p. 2y\, I'l. X\'ll, fit;, ir. 



Cpk., Proc. Zool. Soc, 1S56, p. 210. 

 Cryfitomya californica CoN., Proc. Phil. Acail. Nat. Sci., 1H49, p. 121. Cpk., Hrit. Assii. Rept., 1863, 



p. 637, =C <?t'rt//.f Con. (y/Vf Gahb, Pal. Cal. Vol. II, p. 90, 1869). Cooper, jtli 



Ann. Rept. Cal. St. Min., 1888, p. 237. Kkep, West Coast Shells, p. 205, 1892. 



Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1S92, p. 183. Pai.i,, Trans. Wajjncr 



Inst. Sci., Vol. Ill, Part. 4, 1898, p. 859. 



Shell rather small, subelliptical, convex, equivalve, subequilateral, tliiii; anlvrior cxlrcinity 

 biauricular, with faint fold running down from umbo to lower portion of this extremity; posterior 

 extremity evenly roumled, slitjlitly more produced below middle; ventral martjin slightly arcuate; 

 surface sculptured by numerous tine, concentric, incremental lines; right valve with prominent 

 lamellar tooth, in which is a shallow cartilage-pit or ch(5ndrophorc; left valve with .1 broad fosset; 

 pallial sinus obsolete. 



Dimensions. — Long. 26.5 mm.; alt. iS mm.; diam. 5 mm. 



Distiiigiii-sliablc from young of Ti'esnti nnttnUi by llie luincllar clevali'tl Loolh 

 and obsolete sinus. Specimens identified by Dr. Dall. 



Found in the lower San Pedro series at Deadrnan Island and San I\'dro; 

 and in tlie iij)per San Pedro series at San Pedro, Deadman Island, Los Cerritos, 

 Crawfish (Jeorge's, and TiOng Reach. Found also in the Pleistocene at Twenty-sixth 

 Street and Spanish Bight, San Diego; and at the old irrigating ditch iind Barlow's 

 ranch, Ventura. 



Living. — British Columbia to Lower California (Dall). 



Pleistocene. — San Pedro (Arnold): San Diego well (Cooper): San Diego; 

 Ventura (Arnold). 



Pliocene. — Santa Rosa; Twelve Mile- House, San Mateo County; Sofpiel, Santa 

 Cruz County; San Fernando; San Diego well (Cooper). 



Miocene. — Siebeck's, Santa Clara County; Griswold's, San I'enito County; 

 Fuxin's, Santa Barbara County (Cooper). 



Family XXX VIL CORBULID.E. 

 Genus Corbula (Bruguiera) Lidiuirck. 



Valves unequal, the right usually larger, Ijoih more or less rostrate; hinge with (in the right 

 valve) a single large tooth below the beak, with a deep resiliary pit behind it, and no lateral laminre; 

 the left valve without laterals, with a process upon which the resilium and ligament are inserted, in 

 front of a socket, into which the cardinal tooth of the right valve fits; beaks prominent; sculpture 

 variable, never strongly radial; pallial line with a small sinus or none; lunule and escutcheon usually 

 absent; ligament chiefly internal. 



Corhula galli'^n Lam. is a characteristic species. 



