PLATE IV. 



Fig. 



1. Purpuroidea Moreausia, p. 27, front view. 

 la. — — back view. 



2. — — back view, shell of advanced growth, 



larger specimen. 



3. — — young shell, front view. 

 3a. — — young shell, back view. 



4. — — cast of the interior. 



5. Purpuroidea glabra, p. 28, front view. 

 5a. — — back view. 



0. — — young shell, front view. 



6a. — — young shell, back view. 



