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ffliynchonella yiiathophora Meek ? 609 



Figs. 1,2. Two views of a .small specimen from near Snake River; enlarged li diameters. 



3,4. Similar views of a larger example from near Vermilion Canyon, northwestern 

 Colorado; enlarged li diameters (United States National Museum, No. 8853). 



(h-ypha-a ealceola var. nebrascensis M. and H 612 



Fig. 5, Small left valve with strong stria'; enlarged 1+ diameters. 

 6. 7. Two views of a larger specimeu ; natural size. 



Lima cinnabarensis u. sp 612 



Fig. 8. Right valve; enlarged 1A diaiueters. 



Gryphaa plaiioconve.ra Whitfield 611 



Fig. 9. Left valve from near lower canyon of the Yellowstone (United States National 

 Museum, No. 12369). 

 10. Right valve from near Snake River. 



Campioneetes perlenuistriatus H. and W 611 



Fig. 11. Right valve from Flat Mountain, slightly distorted. The obscure radiating ridges 

 are probably aceideutal. 



Camptonectrs bellistriatus Meek 613 



Fig. 12. Right valve from the Bighorn Mountains, Wyoming (United States National 

 Museum, No. 18S5). 



Camptonectes bellistriatus var. distaiis n. var 614 



Fig. 13. Right valve. 



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