CAMBRIAN BRACHIOPODA WALCOTT I 23 



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Linnarssonella nitens, new species 9i 



Fig. 7. Top and side views of type specimen of ventral valve from 

 Upper Cambrian limestones of the Orr formation, south of 

 Marjum Pass, House Range, Millard County, Utah. U. S. 

 National Museum Catalogue No. 52198a. 



Linnarssonella modesta, new species 9^ 



Fig. 8. Top and back view of a ventral valve. U. S. National Mu- 

 seum Catalogue No. 53679. 

 8a. Interior of a ventral valve. U. S. National Museum Cata- 

 logue No. 52197a. 



The specimens represented by Figs. 8 and 8a are from 

 Upper Cambrian shales of the Orr formation, south of 

 Marjum Pass, House Range, Millard County, Utah. 



Linnarssonella urania, new species 92 



Fig. 9. Exterior of a ventral valve. U. S. National Museum Cata- 

 logue No. 52202^. 

 90. Cast cf the interior of a dorsal valve. U. S. National Mu- 

 seum Catalogue No. 52202^. 



The specimens represented by 9 and 9a are from Mid- 

 dle Cambrian limestones in Big Cottonwood Canyon, 

 southeast of Salt Lake City, Utah. 



Acrothelc yorkensis, new species 88 



Fig. 10. Type specimen showing exterior of a crushed ventral valve 

 from Middle Cambrian shales at York, York County, 

 Pennsylvania. U. S. National Museum Catalogue No. 

 520310. 



Acrothele zvoodworthi, new species 88 



Fig. II. Top view and side outline of a cast of the type specimen of a 

 ventral valve from the Lower Cambrian Nahant limestone, 

 at Nahant, Essex County, Massachusetts. U. S. National 

 Museum Catalogue No. 52030 (cast). 



Acrothele turneri, new species 87 



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

 Middle Cambrian shales south of Emigrant Peak, Esme- 

 ralda County, Nevada. U. S. National Museum Catalogue 

 No. 52028a. 



Nisusia rara, new species 97 



Fig. 13. Exterior of a ventral valve. LI. S. National Museum Cata- 

 logue No. 52295a. 

 13a'. Cast of the interior of a dorsal valve. U. S. National 'Mu- 

 seum Catalogue No. 52295^7. 



The specimens represented l)y Figs. 13 and 13a are from 

 the Middle Cambrian Spence shales in Spence Gulch, west 

 of Montpclier, Bear Lake Count}', Idaho. 



Nisusia (lainesella') lozvi, new species 98 



Fig. 14. Top and .=ide views of tj'pe specimen of ventral valve from 

 Lower Cambrian limestones 5 feet (1.5 m.) below the 

 top of the Mt. Whj-te formation, just above the tunnel, 

 north shoulder of Mt. Stephen, 3 miles (4.83 km.) east of 

 Field, British Columbia. U. S. National Museum Cata- 

 logue No. 53677a. 



