﻿ii7 Paleontology 39 



PLATE IV. 



Martinia maia a 33 



Fig. 1. Dorsal view of small individual. Logan, Utah, (x 1) 

 1 a. Front view of the same individual. 



ib. Dorsal view of a larger specimen with a high and slightly 

 incurved area in the ventral valve. Logan, Utah, (x 1) 

 ic. Front view of the same. 



id. Dorsal view of a completely exfoliated shell, showing the 

 fine striae which characterize the inner surface of the 

 shell. Logan, Utah, (x 1) 

 1 e. Side profile of the'same. 



if. Dorsal view of a broad individual. Logan, Utah, (x 1) 

 ig. Front view of the same showing fine striae similar to those 

 in fig. id. Logan, Utah. 



Pleurotomaria sp 35 



Fig. 2. View of an exfoliated shell. Logan, Utah, (x 2) 



Loxonema nobile 35 



Fig. 3. View of a natural cast of shell. Flat Iron Mountain, 

 Lewis and Clark Forest Reserve, Mont, (x 1) 



Bythocyprisf sp 35 



Fig. 4. A view of a left valve showing part of overlapping border. 

 Paradise, Utah, (x 2) 



Pterinopecten sp 33 



Fig. 5. View of left valve. Paradise P. 0., Utah, (x 1) 



Tropidocyclas sp 34 



Fig. 6. View of a fragmentary specimen. The inner whorl is too 

 broad at the point of overlapping. Logan, Utah, (xi) 



a In figures 1 and ib the shell was tilted slightly upward at the beaks 

 in order to show the area of the ventral valve. 



