DESCRIPTION OP PLATE LXVIII— Continued. 587 



Page. 

 Fig. 8. Productella cooperensis 528 



a. Lateral view of a specimen identified as Productella cooperensis. 



b. Anterior view of same. 



c. A dorsal valve associated with the above and referred to the same species. 



Madison limestone, Crowfoot Ridge, Gallatin Range, top of bed 24. 



Fig. 9. Productella cooperensis 528 



a. A dorsal valve of a type common in Yellowstone National Park. 

 6. Ventral valve of the same species. 



Madison limestone, Crowfoot Ridge, Gallatin Range, top of bed 25. 

 Fig. 10. Productella alifera n. sp 530 



a. A dorsal valve of a common size and shape. 



b. Outline view of a highly vaulted ventral valve. 



c. A very auriculate ventral valve. 



Madison limestone, limestone bluff south side of Soda Butte Creek, northwest 

 of Abiathar Peak, Absaroka Range. 

 Fig. 11. Producing gallatinensis n. sp. (See also fig. 7) 533 



a. Ventral view of the type specimen. 



b. Anterior view of same. 



c. Posterior view of same. 



d. Side view of same. 



Madison limestone, divide between Gallatin River and Panther Creek, Gallatin 

 Range. 



Fig. 12. Eumetria remeuiliana 560 



a. Dorsal view of a somewhat crushed specimen of a type common in Yellowstone 



National Park, x 2. 

 6. Side view of same, x 2. 



Madison limestone, Crowfoot Ridge, Gallatin Range, top of bed 25. 



