Vol. VII] WARING— STRATIGRAPHIC AND FAUNAL RELATIONS 59 



Pelecypoda 

 Crassatellites triangulatus, new species. 

 PI. 9, Fig. 1 



Shell thick, robust, triangular, convex ; beaks broad, in- 

 curved, somewhat depressed; cardinal margin convex and 

 sloping to the posterior end which is subangular ; anterior end 

 rounded below and deeply excavated above; basal margin 

 broadly convex; umbonal ridges rather square; surface 

 marked by concentric lines of growth. 



This species somewhat resembles Gabb's Crassatella uva- 

 sana,^^ but the umbonal angle of the new species is smaller, 

 the umbonal ridges are more square, the ribbing covers the 

 entire shell, and the posterior extremity is more truncated. 

 Locality 3, L. S. J. U. Pal. Coll. 



Crassatellites tuscanus Gabb. 

 PI. 8, Fig. 4 



Astarte tuscana Gabb, Pal. Gal, Vol. 1, p. 179, pi. 30, fig. 



257. 



Astarte tuscana Gabb, Geol. Surv. Canada, vol. 1, pt. 2. p. 

 160, pi. 18, fig. 6. 



Shell moderate in size, elongate ; umbone inconspicuous and 

 anterior; cardinal margin slightly convex and sloping gradu- 

 ally towards the posterior, which is broadly rounded ; anterior 

 margin truncated and rounded and basal margin broadly con- 

 vex; surface ornamented by irregular fine to coarse lines of 

 growth, and where worn, by fine radial lines ; beaks excavated 

 both posteriorly and anteriorly. Locality 2, L. S. J. U. Pal. 

 Coll. 



Cucullaea youngi, new species 



PI. 8, Fig. 12 



Shell large, thick, ventricose; strongly convex, so that the 

 maximum umbonal breadth across both valves about equals 



"Geol. Surv. of Cal. Pal., vol. 1, p. 214, pi. 32, fig. 284. 



