550 CRETACEOUS PALEONTO'LOGY. 



Remarks.- — ^This species has not been met with in recent in- 

 vestigations of the Survey and nothing can be added to Whit- 

 field's discussion. 



Formation and locality. — Raritan clay, near Washington 

 (Conrad.) 



Geographic distribution. — New Jersey. 



Genus Eriphyi^a Gabb. 



Eriphyla conradi (Whitfield). 



Plate LX., Pigs. 4-8. 



1886. Gouldia conradi Whitf., Pal. N. J., vol. i (Monog. U. 



S. G. S., vol. 9), p. 125, p.l. 18., figs. 1-3. 

 1905. Eriphyla conradi Johns., Proc. Acad. Nat. Sci. PhiL 



(1905), p. 14. 



Description. — "Shell small, the largest specimen observed not 

 exceeding three-sixteenths of an inch in its greatest diameter. 

 Valves subtriangular, approaching a quadrangular outline by the 

 truncation of the posterior extremity, which gives the valves 

 when seen from the exterior much the form and character of a 

 young Crassatella, which is also added tO' by their moderate 

 convexity. Beaks small and pointed. Anterior and posterior 

 sides of the cardinal margin straight, forming a little more than 

 a right angle with each other, the posterior side being nearly 

 one-half longer than the anterior, and the basal line somewhat 

 regularly rounded. Surface of the shell marked by concentric 

 undulations, which are abruptly bent in crossing the umbonal 

 ridge. Posterior umbonal slope flattened. Lunule rather long 

 and narrow. Substance of the shell thin. Ligamental pit of 

 the hinge small in the left valve, and the posterior cardinal 

 tooth-cavity linear and extending nearly the entire length of the 

 cardinal border. In the right valve the pit is larger and the 

 anterior lateral tooth-cavity more strongly marked. Muscular 

 scars and pallial line distinctly marked in the right valve 

 (figured), but much less strongly so in the left one, which is 

 thinner in substance, although a slightly larger valve." (Whit- 

 field.) 



