332 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



Genotype. — Bathyuriscus haydeni Meek. 



Stratigraphic range. — As far as known, Bathyuriscus and its sub- 

 genus Poliella are found in the upper portion of the Lower Cambrian 

 as B. (Poliella) primus, which is abundant in the siliceous strata 

 occurring in the upper part of the Mount Whyte formation, and B. 

 batis, which is associated with Mesonacis gilberti in southwestern 

 Nevada, B. belus and B. belesis from Montana and doubtfully of 

 Lower Cambrian age. The greatest development of the genus is in 

 the Middle Cambrian formations : Bathyuriscus {Poliella) probus 

 in the Marjum formation of Utah; B. haydeni and B. (Poliella) 

 power si occur in the Gallatin limestone ; B. howelli, in the Chisholm 

 shale ; B. adceus, B. (Poliella) occidentalis, B. ornatus, and B. rotund- 

 atus, Ogygopsis shale of Stephen formation ; B. (Poliella) sylla, 

 Chetang formation; B. anax, B. (Poliella) anteros, B. atossa, B. ? 

 bithus, and B. (Poliella) caranus, Spence shale horizon at base of the 

 Ute formation ; B. bantius, sandstone of Rome formation ; B. (Poli- 

 ella) balus, shales of the York formation, and Bathyuriscus sp., Cona- 

 sauga formation. 



Geographic distribution. — Nevada, B. howelli and B. batis. North- 

 ern Utah, B. anax and B. bithus. Southern Idaho, B. (Poliella) an- 

 teros, B. atossa, B. belesis, and B. belus. Montana, B. haydeni and 

 B. (Poliella) powersi. Eastern British Columbia at Mount Stephen, 

 B. adceus, B. rotundatus, B. ornatus, B. (Poliella) occidentalis, and B. 

 (Poliella) primus. The last species also occurs near Lake Louise in 

 western Alberta. In the Robson Peak section, British Columbia, 

 Bathyuriscus (Poliella) sylla. Eastern Tennessee, B. bantius. Cen- 

 tral Pennsylvania, B. (Poliella) balus. The genus appears to be 

 represented in Asia by B. stolicskai, which is found in Kashmir, 

 northern India. 



Observations. — I have heretofore included Ogygia producta Hall 

 and Whitfield under Bathyuriscus, but with present information it is 

 necessary to refer that species and several others to the genus Dolicho- 

 metopus, as they differ materially from the typical forms of Bathyu- 

 riscus. My impression of the latter genus was so influenced in 1886 

 by the study of fragments of (Ogygia) Bathyuriscus producta Hall 

 and Whitfield that I concluded that that species was a typical form 

 of Bathyuriscus and when I found a specie^ not generically related to 

 producta I listed it as a new genus and species.' 



Another confusing form was the species now known as Bathyuris- 

 cus (Poliella) occidentalis (Matthew) (pi. 46, fig. 3). Matthew's 



Borncmannia prima: Smithsonian Misc. Coll., Vol. 53, 1908, pp. 213, 214. 



