EXPLANATION OF PLATE VL 

 (Draivings by G. T. Kline.) 



Fig. 13a. — External view of left valve of a new species, Truncilla 



Lefevrei Utterback. cT (Nat. size.) 



Fig. 13b. — Internal view of right valve of T. Lefevrei. cf 



Fig. 1 3c. — External view of left valve of T. Lefevrei. 9 



Fig. 13d. — Internal view of right valve of T. Lefevrei. 9 



Fig. 14a. — External view of left valve of a new species, Truncilla 



Curtisi Frierson and Utterback. cT (Nat. size). 



Fig. 14b. — Internal view of right valve of T. Curtisi. cf 

 Fig. 14c. — External view of left valve of T. Curtisi. 9 

 Fig. i4d. — Internal view of right valve of T. Curtisi. 9 



