PLATE II. 



Straparollus lativolvis. 

 Page 178. 

 Fig. I. Front view of specimen figured on Plate I., Fig. i. 



StRAPAKOLLU.S BICARINATU.S 



Page 179. 

 Fig. 2, a. Umbilical side. 

 Fig. 2, b. Fi-ont view of a different individual. 



SCHIZODUS symmetricus. 



Page 176. 

 Fig. 3, a. Cardinal view. 

 Fig. 3, b. View of right side. 



Platystoma niagarense, var. multilineatum. 

 Page 177, 

 Figs. .|, a, b, c. Different views of a t}'pical specimen of this variety. 



