44 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



Poliella occidentalis (Matthew) 

 Dolichoniefoptis occidentalis Matthew, Trans. Roy. Soc. Canada, 2d ser., vol. 5, 



sec. 4, p. 49, pi. 2, fig. 2, 1899. 

 Bathynriscus pupa Matthew, idem, p. 51, pi. 2, fig. 5. 

 Bathynriscns occidentalis Walcott, Smithsonian Misc. Coll., vol. 53, no. 2, 



p. 41, 1908. Walcott, Canadian Alpine Journ., vol. I, pt. 2, pi. 3, fig. 2, 



1908. 

 Bathyuriscus (Poliella) occidentalis Walcott, Smithsonian Misc. Coll., vol. 64, 



no. 5. P- 351, Pl- 46, fig. 3. 1916. 



Owing to the poor preservation of the holotype, this species would 

 be inadequately represented except that two excellent carapaces have 

 just been discovered in our collections. It seems that the pygidium 

 fits Poliella. The published figures are restored more than warranted. 



Middle Cambrian, Stephen ; (loc. 14s) Mount Stephen, near Field, 

 British Columbia. 



Holotype. — Royal Ontario Museum (casts U.S.N.M. no. 62621). 



Poliella prima (Walcott) 



Bathynriscns {Poliella) prinius Walcott (part), Smithsonian Misc. Coll., 

 vol. 64, no. 5, p. 352, pi. 46, figs. 6, 6a. 6b, 1916. (Not 6c, d = P. 

 castlensis.) 



This is described as a Lower Cambrian species but belongs to the 

 Ptarmigan formation. 



Middle Cambrian, Ptarmigan; (Iocs. 35m, 35e) 3 miles southwest 

 of the head of Lake Louise, Alberta. 



Lectotypc. — U.S.N.M. no. 62624; paratype no. 62623. 



Poliella castlensis, n. sp. 



Bathyuriscus {Poliella) primus Walcott (part), Smithsonian Misc. Coll., 

 vol. 64, no. 5, p. 352, pi. 46, figs. 6c, d, 1916. 



It is necessary to separate this head from P. prima because of its 

 wider brim and eyes which have a more divergent position. 



Middle Cambrian, Ptarmigan: (loc. 58t) Castle Mountain, Alberta. 

 Holotype.— U.S. 'N.U. no. 62626. 



Poliella caranus (Walcott) 



Bathyuriscus {Poliella) caranus Walcott, Smithsonian Misc. Coll., vol. 64, 

 no. 5, p. 350, pi. 46, fig. 5, 19 1 6. 



This form barely remains within the genus because of its greatly 

 reduced brim. 



Middle Cambrian, Spence ; (loc. 55c) Liberty Canyon, west of 

 Montpelier, Idaho. 



Holotype.— U.S.'H.'M.. no. 62628. 



