PLATE IV. 
Hetevocevas amapondense v. Hoepen. 
1. Lateral view of type. Slightly less than nat. size. The length of the 
visible portion of the fourth rib from the left in the interval between 
the two large ribs on the left of the second whorl is i8 mm. 
2. Apical view of the specimen. Slightly less than nat. size. 
Desmoceras crassum v. Lfoepen. 
3. Lateral view of type. Nat. size. 
4. Anterior view of same. Less than nat. size. 
Desmoceras compactum v. Hoepen. 
5. Lateral view of type. Nat. size. 
6. Anterior view of same. Slightly less than nat. size. 
7. Posterior view of same. Slightly less than nat. size. 
