CAMBRIAN BRACHIOPODA — WALCOTT II9 



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Oboliis (Ford in id) perfect us, new species 65 



Fig. 16. Type specimen showing interior of ventral valve from Mid- 

 dle Cambrian shaly limestones of the Weeks formation, 

 south of Marjum Pass, House Range, Millard County, 

 Utah. U. S. National Museum Catalogue No. 51947a. 



Obolus tvortheni, new species 63 



Fig. 17. Type specimen showing interior of dorsal valve from the 

 Upper Cambrian limestones of the St. Charles formation 

 in Two Mile Canyon, southeast of Malad, Oneida County, 

 Idaho. U. S. National Museum Catalogue No. 51638(1. 



