1*28 CAI.IItlUN'IA .\( ADKMV OK SCIKNC^ES. 



CVnitos, ami is miw in llic riiiltil Slatt's Nalioiial Mu-^eiim. I'launl al-o in tlu' 

 Pleistocetie of Twi-iity-sixtli Street, San Diej^o. 



Pkislocene. — San IVilm; San Dici^o (Arnold). 



SuiuTfamily CAKDITALKA. 



Kaniiiy XIX. OA KDllI U.K. 



(ieiiiis Venericardia Lanuirck. 



Shell suborbicular, inciiuilattral, radiately ribbed; liinye wiili two oblique canlinal ti/e-ih 

 and no laterals. 



Venericardia j)lanicuslala Lamarck is a characteristic species. 



54. Venericardia barbarensis Steams. 



Venericardia barbarensis Stearns, Proc. U. S. Nat. Mus.,Vol. XIII, 1891, j). 214, PI XVI, fig.s. 3, 4. 



Shell rounded, inequilateral, variable in outline, more or less obiiciue, moderately convex; 

 beaks small, slightly elevated and turned forward; surface ornamented with nineteen or twenty radi- 

 ating ribs, usually somewhat granulose; lunule small, slightly sunken, faintly defined; hinge-line 

 small, not thick ; hinge composed of, in left valve, a single strong cardinal sloping po.steriorly 

 and a smaller tooth, often obscure, slanting anteriorly; a third tooth-like process is generally present, 

 situated under, and apparently a projection of, the edge of the lunule; the right valve has a single 

 strong cardinal tooth with a slanting, somewhat sinuous groove above and a slight notch and tooth- 

 like point below the upper part of the lunule; muscle impressions small. 



Dimensions. — Long. 19.5 mm.: alt. 17 mm.; diam. 14 mm. 



Distiniiiii-sliable from I', reiitricosa l)y uujre .siibrectanguhir outline, j^roater 

 relative lengtli; greater number of ribs, less prominent beak, raucli narrower and 

 longer hinge-line, and sliorter, slighter posterior cardinal tooth, \vhi(th is straight. 



Common in Pliocene and lower San Pedro series of Deadman Island; rare 

 in Pliocene at Timm's Point and upper San Pedro series of Crawfish George's and 

 San Pedro. Found also west of batli-honse at Santa liarbara. 



Living. — Santa Barbara I-lands (1'7<) fathoms) (Stearns). 



J'leistocene. — San Pedro (.Vrnold): Santa Barbara (Aiiiold). 



Pliocene. — Sau Pedro (Arnold). 



55. Venericardia ventricosa Gould. 



Cardita ventricosa Gld., Proc. Bost. Soc. Nat. Hist., 1850, p. 276; Wilkes Expl. Exped., Vol. XII, 



p. 417, PI. XXXVI, fig. 532, 1852, =C subtenla Con., =C mo7iilicosta Gabb, =(7. occi- 



denlalis Con., {fide Gabb, Pal. Cal., Vol. II, 1869, p. 100). 

 Venericardia borcalis var. ventricosa Gld., Cpr., Brit. Assn. Rept., 1863, p. 643. Cooper, 7th Ann, 



Rept. Cal. St. Min., 1888. p. 269. 

 Venericardia ve7itricosa Old., Stearns, Proc. U. S. Nat. Mus., Vol. XIII, 1891, p. 216, PI. XVI, 



figs. 5 and fi. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 190. 



