NO. lO CAMBRIAN FOSSILS, 4TH CONTRIBUTION RESSER 39 



PTARMINGIA Raymond, 1928 



Ptarmingia longula, n. sp. 



Bathyuriscus cf. rosscnsis Waixott, Smithsonian Misc. Coll., vol. 67, no. 2, 

 p. 49, pi. 5, figs. 6, 6a, 191 7. 



This Species has a longer head than P. rossensis. The glabella is 

 long, expanding only a little; eyes larger and prominent. A few 

 widely scattered granules occur on the elevated portions of the test 

 but appear to be much more numerous on exfoliated specimens. 



The associated pygidium is very highly arched transversely and 

 has a rather even border, with a large spine at the anterior angles. 



Middle Cambrian, Ptarmigan; (loc. 63m') i mile east of Hector, 

 south slope Mount Bosworth, British Columbia. 



Holotypc. — U.S.N.M. no. 63734; paratype, no. 63735. 



PTEROCEPHALIA Roemer, 1849 



Pterocephalia multicincta (Hall and Whitfield) 



Dicellocephalus multiciiicfiis H.\ll and Whitfield, U. S. Geol. Expl. 40th 



Par., vol. 4, p. 226, pi. 2, fig. 37, 1877. 

 Pterocephalia sanctisabac Bridge (part), U. S. Geol. Surv. Prof. Pap. 186-M, 



p. 249, pi. 68, figs. Z7, 38, 1937- 



Upper Cambrian, Secret Canyon ; Eureka District, Nevada. 

 Holotypc. — U.S.N.M. no. 24640; plesiotype, no. 93021. 



Pterocephalia laticeps (Hall and Whitfield) 



Conocephalites (Pterocephalus) laticeps Hall and Whitfield, U. S. Geol. 



Expl. 40th Par., vol. 4, p. 221, pi. 2, figs. 4-7, 1877. 

 Pterocephalia sanctisabac Bridge (part), U. S. Geol. Surv. Prof. Pap. 186-M, 



p. 248, pi. 68, figs. 40-43. 1937- 



Upper Cambrian, Secret Canyon; west side of Pogonip Mountain. 

 White Pine District, Nevada. 



Cotypcs. — U.S.N.M. nos. 24562, 24561, 24579. 



Pterocephalia dakotensis, n. sp. 



Pterocephalia sanctisabac Bridge (part), U. S. Geol. Surv. Prof. Pap. 186-M, 

 p. 246, pi. 68, figs. 27-30, 32-36, 39, 1937. 



This species averages about the same size as the largest specimens 

 of P. sanctisabac . It is characterized by rather large eye lobes, set 

 nearly parallel with the axis. The pygidium is ovate, partly tiattened 

 in the shaly matrix. 



P. dakotensis has a less flaring course of the anterior facial suture 

 than P. sanctisabac, the eyes are more nearly parallel to the axial line 



