PLATE LXIX. 



Pa £e. 

 Fig. 1. Camaropkoria ringens 537 



a. Ventral view of a large specimen. 



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



b. Dorsal view of a smaller specimen. 



c. Side view of same. 



Madison limestone, Crowfoot Ridge, Gallatin Range, bed 28. 



Fig. 2. CamarotcecMa lierrickana n. sp 539 



a. (by mistake left unnumbered on plate) Ventral valve, sligbtly enlarged. 



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

 6. Dorsal valve, similarly enlarged, 

 c. Anterior view of same. 



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

 Range. 

 Fig. 3. CamarotcecMa metallica 540 



a. Dorsal view of a specimen identified by Hall and Whitfield as Rhynchonella pustu- 



losa (?) ; after Hall and Whitfield. 

 Waverly age, Dry Canyon, Utah. 



b. Dorsal view of a large specimen from Yellowstone National Park. 



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

 Range. 



c. Anterior view of a smaller a specimen from Yellowstone National Park. 



d. Side view of same. 



e. Dorsal view of same. 



Madison limestone, northwest slope of Forellen Peak, Teton Range. 



Fig. 4. CamarotcecMa sp 542 



a. Dorsal valve, x 2. 



6. Front view of same, x 2. 



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

 Abiathar Peak, Absaroka Range. 

 Fig. 5. IAorh yuchus Itaguei n. sp 543 



a. Dorsal view of type specimen. 



b. Lateral view of same. 



Madison limestone, Crowfoot Ridge, Gallatin Range, cherty limestone, top of 

 bed 24. 

 Fig. 6. Dielasma Utah 544 



a. Dorsal view of an imperfect example. 



b. Side view of same. 



Madison limestone, Crowfoot Ridge, Gallatin Range, bed 28. 

 e. Ventral view of type specimen ; after Hall and Whitfield. 



Waverly age, Cottonwood divide, Wasatch Range, Utah. 



Fig. 7. Producing scabriculus 531 



o. Side view of a ventral valve from the Madison limestone. 



b. Posterior view of same. 



c. Outline of same, looked at from above. 



d. Surface ornamentation, enlarged. 



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

 590 



