XO. 5 CAMBRIAN TRILOBITES 415 



PAGE 



Bathyuriscus (Foliclla) aiitcros Walcott 349 



Fig. 5. (X2.25.) A crushed dorsal shield, t'^e type specimen of the 

 species. U. S. National Museum, Catalogue No. 62622. 



From locality 55c, Middle Camhrian : Spence shale member of 

 the Ute formation; about 50 feet (15.2m.) above the Brigham 

 quartzite, and 2.755 f^et (839.7 m.) below the Upper Cambrian, in 

 a ravine running up into Danish Flat from Mill Canyon, about 6 

 miles (9.6km.) west-southwest of Liberty and 15 miles (24.2 km.) 

 west of Montpelier, Bear Lake County, Idaho. 



Bathviiriscus (Policlla) primus (Walcott) 352 



Fig. 6. (X3-) An entire dorsal shield shortened by compression and 



slight distortion in the shale. L^ S. National Museum, 



Catalogue No. 62623. 



6a. (X3-) Dorsal shield laterally compressed by slight distortion 



in the shale. U. S. National Aluseum, Catalogue No. 62624. 



The specimens represented by figs. 6 and 6a are from locality 

 35m, Lower Cambrian: Mount Whyte formation {Albcrtella 

 zone) : 3 miles (4.8km.) southwest of the head of Lake Louise, on 

 east slope of Mount Whyte, Alberta, Canada. 



6b. (X 2.) Matrix of a dorsal shield that is slightly distorted, and 

 its cranidium has an unusually large and deep postero- 

 lateral limb. U. S. National Museum, Catalogue No. 62625. 



From locality 35e, Lower Cambrian: Mount Whyte formation. 

 Lakes Louise and Agnes Cambrian section; amphitheatre between 

 Popes Peak and Mount Whvte, south of Lake Agnes, south of 

 Laggan, on the Canadian Pacific Railway, in western Alberta, 

 Canada. 



6c (Natural size) and 6d (X2). Cranidium from an arenaceous 

 shale. U. S. National Museum, Catalogue No. 62626. 



From locality sSt, Lower Cambrian : Sandy shale about 150 feet 

 (45.7 m.) below the Middle Cambrian, just below the big cliff on 

 the east shoulder of Castle Mountain, north of the Canadian Pa- 

 cific Railway, Alberta, Canada. 



Bathvuriscus (Policlla) sp. undt. (i) ■ • ■ • • ••••■.•••;■;;•• ^^^ 



Fig. 7. (Natural size.) Top view of pygidium. U. S. National Mu- 

 seum, Catalogue No. 62627. 

 From localitv 356, Lower Cambrian : Mount Whyte formation. 

 Lakes Louise and Agnes Cambrian section ; amphitheatre between 

 Popes Peak and Mount Whvte. south of Lake Agnes, south of 

 Laggan, on the Canadian Pacific Railway, in western Alberta, 

 Canada. 



Bathvuriscus (Policlla) caranus Walcott ■••■•■ 350 



Fib 8 (X4.) An entire dorsal shield exclusive of the free cheeks 



This is the type specimen of the species. U. S. National 



Museum, Catalogue No. 62628. 



From localitv 55c, Middle Cambrian: Spence shale member of 



the Ute formation; about 50 feet (i5-2tn.) 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 west-southwest of Liberty and 15 miles west of Montpelier, 



mues wesL-buuLiiwcsL <jl s^ 

 Bear Lake County, Idaho. 



