4l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 48 



PAGE 



Bathyuriscus anax Walcott 335 



Fig. I. (X I-25-) Dorsal shield flattened in fine arenaceous shale. 

 U. S. National Museum, Catalogue No. 62637. 

 10. (Natural size.) Cranidium flattened in shale. U. S. National 



Museum, Catalogue No. 62638. 

 ih. (Natural size.) Cranidium compressed and elongated in the 

 shale. U. S. National Museum, Catalogue No. 62641. (30a.) 

 ir. (X2.) Pygidium flattened in shale. U. S. National Museum. 



Catalogue No. 62639. 

 i^. (X3-) Hypostoma partly restored from an associated speci- 

 men. U. S. National Museum, Catalogue No. 62640. 



The specimens represented by figs, i, la, ic, and id are from 

 locality 556, Middle Cambrian : Spence shale horizon of the Ute 

 formation; about 100 feet (30.5 m.) above the Brigham quartzite, at 

 the mouth of tlie first small canyon south of Wasatch Canyon, east 

 of Lakeview Ranch, Boxelder County, Utah. 



The specimen represented by fig. lb is from locality 30a, Middle 

 Cambrian : Shale on north side of Big Cottonwood Canyon, i mile 

 (1.6 km.) below Argenta, in the Wasatch INIountains southeast of 

 Salt Lake City, Salt Lake County, Utah. 



Bathynnscns afossa Walcott 336 



Fig. 2. (X I-5.) A very fine dorsal shield flattened in argillaceous 

 shale. U. S. National Museum, Catalogue No. 62642. 

 2a. (X2.) Cranidium. Note spine on occipital ring. U. S. 



National Museum. Catalogue No. 62643. 

 2b. (X3-) Cranidium. U. S. National Museum, Catalogue No. 

 62644. 

 The specimens represented by figs. 2, 2a-b are from locality 55c, 

 Middle Cambrian : Spence shale member of the Ute formation ; 

 about 50 feet (15.2 m.) above the Brigham quartzite, and 2,755 feet 

 (839.7 m.) below the Upper Cambrian, in a ravine running up into 

 Danish Flat from Mill Canyon, about 6 miles (9.6 km.) west-south- 

 west of Liberty and 15 miles (24.2 km.) west of ^lontpelier. Bear 

 Lake County, Idaho. 



Bathyuriscus (Poliella) sylla Walcott 354 



Fig. 3. (X2.) Cranidium and free cheek. U. S. National Museum. 

 Catalogue No. 62645. 

 3a. (X2.) Four thoracic segments and p^'gidium. U. S. National 



Museum, Catalogue No. 62646. 

 3b. (X I-5-) Free cheek. U. S. National Museum. Catalogue No. 



62647. 

 3c. (X2.) Free cheek. U. S. National Museum. Catalogue No. 

 62648. 



