MESOZOIC FOSSILS. 



623 



and (the type) from west end of ridge southeast of mouth of Mink Creek, 

 where it was collected by Professor Iddings. 



Cypricardia? haguei n. sp. 



PI. LXXIII, figs. 11-13. 



Shell large, inflated, subquadrate in outline; beaks very prominent, 

 strongly curved inward and forward, approximate, and projecting far 

 beyond the hinge line; posterior umbonal slope with a prominent angular 

 ridge descending from the beak to the postero-basal angle and dividing the 

 surface of the shell into two distinct areas, of which the posterior is 

 obliquely flattened, while the rest of the shell is pretty evenly convex; 

 dorsal margin, exclusive of beaks, gently descending behind and excaA^ated 

 in front; anterior end broadly rounded; posterior end obliquely truncate; 

 ventral margin almost straight ; surface sculpture not known, but probably 

 consisting only of lines of growth. 



The two figured specimens, both of which are probably somewhat 

 distorted in different directions, give the following measurements: 



Length. 



Height. 



Convexity 

 of both' 



valves. 



mm. 



mm. 



mm. 



52 



49 



40 



65 



52 



40 



The shorter specimen is more nearly of normal proportions than the 

 other. 



The species is represented by about twenty-five specimens, all of which 

 are internal casts, and, as the details of the hinge have not been satisfactorily 

 made out, the generic reference is only provisional. Impressions of a part 

 of the hinge show the presence of two or three strong cardinal teeth and 

 make it reasonably certain that the shell belongs to the Cyprinidse. The 

 casts also show the adductor muscular impressions and the pallial line. The 

 anterior scar is rather large, semilunar, and (on the cast) much elevated, 

 while the posterior one is somewhat smaller and scarcely at all elevated. 



There are no American species with which this need be compared, but 

 Cypricardia bathonica d'Orb., as figured by Morris and Lycett in Mollusca 



