walcott.] PALEONTOLOGY ROCKY MOUNTAINS. 167 



Crepicephalus (Loganellus) unisulcatus, p. 216. 



(Loganellus) simulator, p. 218. 



(Loganellus) auytus, p. 219. 



(Batbyurus) ? angulatus, p. 220. 

 Couocephalites (Pteroceplialus) laticeps, p. 221, 

 Ptychaspis pustulosa, p. 223. 

 Chariocephalus tuniifrons, p. 224. 

 Dikelocephalus bilobatus, p. 226. 



multicinctus, p. 226. 



flabellifer, p, 227. 

 Agnostus communis, p. 228. 



neon, p. 229. 



prolongus, p. 230. 



tumidosus, p. 231. 

 Lingulepsis ella, p. 232. 

 Conocephalites subcorouatus, p. 237. 

 Crepicephalus f (Loganellus) quadrans, p. 238. 

 Dikelocephalus quadriceps, p. 240. 



wasatchensis, p. 241. 



f gothicus, p. 242. 

 Ogygia producta, p. 244. 



parabola, p. 245. 



Of these species those from Lingulepsis ella to Ogygia parabola, in- 

 clusive, are referred to the Quebec group, and the others to the Pots- 

 dam. The descriptions are accompanied by fine illustrations of all the 

 species mentioned. 



In 1880 Dr. C. A. White referred his Acrotreta f subsidua, described 

 in 1874, to the genus Acrothele of Angelin. 1 



The study of a collection made by the U. S. Geological Survey from 

 the Eureka district, Nevada, gave Mr. 0. D. Walcott material for the 

 description of a number of new species from the Cambrian. They 

 include the following: 2 



Acrothele ? dichotoma, p. 14. 

 Scenella ? conula, p. 15. 

 Kutorgina whitfieldi, p. 18. 



prospectensis, p. 19. 

 Ortbis eurekensis, p. 22. 

 Stenotheca elongata, p. 23. 

 Agnostus richmondensis, p. 24. 



seclusus, p. 25. 

 Olenellus iddingsi, p. 28. 

 Dikelocephalus nasutus, p. 40. 



richmondensis, p. 41. 



Y angustifrons, p. 42. 



iole, p. 43. 



marica, p. 44. 



? expansus, p. 45. 

 Ptycboparia (?) prospectensis, p. 46. 



(?) linnarssoni, p. 47. 



1 Note on Acrothele. U. S. Nat. Mus. Proc, vol. 3, 1880. p. 47. 



% Paleontology of the Eureka district. U. S. Geol. Surv., Monograph, vol. 8, 1884, pp. 11-C4. 



