NO. 3 CAMBRIAN TRILOBITES 233 



PAGE 



Alokistocare pomona Walcott 186 



Fig. 6. (X3-) Entire dorsal shield. Tlie type specimen of the spe- 

 cies compressed in fine shale. U. S. National Museum, 

 Catalogue No. 61577. 



From Middle Cambrian: (isgf) Wolsey shale; Sixteen-mile 

 Canyon, Meagher County, Montana. 



Alokistocare linnarssoni (Walcott) 185 



Fig. 7. (X2.) Type specimen of species. Cranidium. U. S. National 

 Museum, Catalogue No. 2461 1. 

 ya. (X2.) Two cranidia showing variation in width of fixed 

 cheek as compared with fig. 7, also free cheek. U. S. 

 National Museum, Catalogue No. 2461 1. 

 The specimens represented by figs. 7 and ja are from the Middle 

 Cambrian: (58) Shaly limestone in Secret Canyon shale; New 

 York and Secret Canyons, Eureka district, Nevada. 



Alokistocare ? prospectense (Walcott) 186 



Fig. 8. (X4-) Dorsal view of a somewhat flattened cranidium which 

 is the type specimen of the species as it occurs in a shaly 

 limestone. U. S. National Museum, Catalogue No. 15441. 

 The type specimen is from the Middle Cambrian: (52a) Pros- 

 pect Mountain formation; Prospect Mountain, Eureka mining 

 district, Nevada. 



