PLATE 2. 



Strophomcnia agassizi. Section along line C of fig. 4, pi. 1. 



Same along line B of fig. 4, pi. 1. 



Same along line A of fig. 4, pi. 1 . 



Section along line H of fig. 5, pi. 1. 



Section along line D of fig. 4, pi. 1. 



Section along line F of fig. 5, pi. 1. (One third reduced). 



Same along line G of fig. 5, pi. 1. 



Same along line E of fig. 5, pi. 1. X 360. 



Nierstrassia fragile. Ventral fold. X 360. 



Section through radula. X 555. 



