CRETACEOUS FOSSILS. 169 



TAPES, Megerle. 



T. Cc-NRADIANA, n. 8. 

 PI. 32, Pig. 282. 



Shell long, narrow, very inequilateral, oblique; beaks promi- 

 nent, and placed between a tbird and a fourtb of the distance 

 from tbe anterior end ; cardinal margin sloping nearly straight 

 to the posterior extremity, which is narrow and regularly 

 rounded; basal margin most prominent under the beaks, very 

 broadly rounded posteriorly, sloping upwards rapidly in advance 

 to the anterior end. Lunule small, bordered by a simple im- 

 pressed line. Surface ornamented by regular concentric ribs, 

 nearly uniform throughout, rounded above, abruptly truncated 

 on the side towards the beaks, and sloping towards the basal 

 margin, so as to present an imbricated appearance, the overlap- 

 ping being upwards. 



Pigure, natural size. 



Localities: Alizos Creek, near Fort Tejon ; abundant, and associated with Mere- 

 trix Uvasana. 



? T. QUADRATA, n. S. 

 PI. 30, Pig. 249. 



Shell small, compressed, subquadrate, somewhat variable in 

 shape ; cardinal and basal margins convex, subparallel ; beaks 

 anterior, nearly terminal; anterior margin deeply excavated 

 under the beaks, narrowly rounded below; posterior extremity 

 obliquely truncated. Lunule long, narrow, and bordered by a 

 sharp, impressed line. Surface marked by very tine lines of 

 growth, sometimes obsolete. 



Pigure, natural size. 



Localities: Division B., at Fort Tejon; and Martinez : not abundant. 



PAL. VOL. I. — 22 



