CAMBRIAN BRACHIOPODA — WALCOTT 121 



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Dearbornia clarki, new species 78 



Fig. 7. Type specimen showing cast of the interior of a ventral valve 

 from the Middle Cambrian Yogo limestone on the North 

 Fork of the Dearborn River, Lewis and Clark Forest Re- 

 serve, Montana. U. S. National Museum Catalogue No. 

 52214a. 



Trematobolus excelsis, new species 80 



Fig. 8. Type specimen showing cast of the interior of a ventral 

 valve with posterior and side outlines, from Lower Cam- 

 brian limestones 2-3 miles (3.22-4.83 km.) east-northeast 

 of Waucoba Springs, Inyo County, California. U. S. Na- 

 tional IMuseum Catalogue No. 52208(7. 



Acrothele hellapunctata, new species 82 



Fig. 9. Type specimen showing exterior of a partially exfoliated, 

 crushed ventral valve from Lower Cambrian shales at 

 Ringsaker, Province of Hedemarken, Norway. U. S. Na- 

 tional Museum Catalogue No. 519720. 

 9'. Enlargement of a portion of the surface of Fig. 9. 



Acrothele artemis, new species 82 



Fig. id. Type specimen showing interior of a crushed ventral valve 

 from Middle Cambrian limestones of the Langston forma- 

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

 County, Idaho. U. S. National Museum Catalogue No. 

 51969- 



Acrothele b^ergeroni, new species 83 



Fig. II. Type specimen showing cast of the interior of a dorsal valve 

 from Middle Cambrian shales in Montague Noire, Cou- 

 louma, Department of Herault, France. U. S. National 

 Museum Catalogue No. 519750. 



Acrothele borgholmensis, new species 84 



Fig. 12. Top and side views of type specimen of broken ventral valve 

 from the Upper Cambrian Ceratopyge slate, at Borgholm, 

 Oeland Island, Sweden. U. S. National Museum Cata- 

 logue No. 519740. 



Acrothele Icvisensis, new species 85 



Fig. 13. Top view of type specimen of crushed ventral valve from the 

 Lower Ordovician Levis shales, at Point Levis, Quebec, 

 Canada. Collections of the Geological Survey of Canada. 



Acrothele spurri, new species 86 



Fig. 14. Tcp view of type specimen of ventral valve from Lower 

 Cambrian limestones of the Pioche formation, near Pioche, 

 Lincoln County, Nevada. U. S. National Museum Cata- 

 logue No. 15344a- 

 14' and 14". Side and posterior views of an associated ventral 

 valve. U. S. National Museum Catalogue No. 15344^. 



Acrothele subsidua hera, new variety 87 



Fig. 15. Top and side views of type specimen of ventral valve from 

 Lower Cambrian limestones of the Pioche formation, near 

 Pioche, Lincoln County, Nevada. U. S. National Museum 

 Catalogue No. 52024. 



