FOSSILS FROM THE SOURIS. 



337 



(Pal. France, T. III. pi. 410,) but is not near so deeply 

 rounded on the ventral border, and is more compressed. 

 Locality and position. — Same as last.] 



Leda Hindi. (N. S.) 



Natural size. The same enlarged. 



[Shell small, sub- ovate, compressed ; anterior side nar- 

 rowly rounded ; pallial border forming a broad semi-oval 

 or semi-ovate curve, not crenulate within ; posterior side 

 a little longer than the other, much compressed, distinctly 

 sinuous below, and provided with a narrow, short, ob- 

 tusely pointed rostriform extension above ; umbones de- 

 pressed, located a little in advance of the middle ; hinge 

 having about twelve teeth in front of the beaks, and pro- 

 bably more behind ; surface ornamented by distinct, re- 

 gularly arranged, rather strong concentric lines. Length 

 0-35 inch ; height 018 inch. 



This is a very neat little shell, which will be readily 

 distinguished from any of the species yet known in the 

 Nebraska Cretaceous rocks by the distinct sinus in its 

 postero-ventral margin. Even where the border is broken 

 away, the curve of the concentric lines will always show 

 that the sinus did exist in its margin. 



The specimen does not show the pallial line, but in form 

 and general appearance the shell is more like Leda than 

 Nucula; it may, however, possibly belong to the latter genus. 



The specific name is given in honour of Professor 

 Henry Y. Hind, of Trinity College, Toronto, in charge of 

 the Assinniboine and Saskatchewan Exploring Expedition, 

 to whose zeal and industry we are indebted for much 

 interesting information respecting the geology and topo- 

 graphy of the country explored. 



VOL. II. Z 



