WALcorr.l PALEONTOLOGY ROCKY MOUNTAINS. 169 



In 18S6 Mr. 0. D. Walcott reviewed the species which he then con- 

 sidered to belong to the Olenellus, or Middle Cambrian fauna. 1 

 The following new species were described from Utah and Nevada : 



Eocystites ?? longidactylus, p. 94. 

 Ort.his ? bighlandeusis, p. 119. 

 flyolitbes billingsi, p. 134. 

 Leperditia f argenta, p. 146. 

 Olenoides typicalis, p. 183. 



levis, p. 187. 

 Ptychoparia bousensis, p. 201. 



piochensis, p. 201. 

 Crepicepbalus liliana, p. 207. 



august a, p. 208. 

 Orytcocephalus, new genus, p. 210. 

 Orytcocepbalus primus, p. 210. 

 Batbyuriscus bowelli, p. 216. 



The genus Ethmophyllum, described by Mr. Meek in 1868, and the 

 species placed under it referred in the same year to Archaeocyathus, is 

 redefined as the genus Ethmophyllum, with Ethmophyllnm whitneyi as 

 the type (p. 81.) Ethmophyllum gracile Meek is placed as a synonym of 

 the latter species. Descriptions and illustrations of the following 

 species also appear in this work : 



Protospougia fenestrata, Salter, p. 90. 

 Lingulella ella, H. & W. p. 97. . 

 Acrotreta gemma, Billings, p. 98. 

 Kutorgina pauuula, Wbite, p. 105. 



prospectensis, Walcott, p. 106. 

 Acrotbele subsidua. Wbite, p. 108. 

 Scenella ? conula, Walcott, p. 127. 

 Stenotbeca ? elongata, Walcott, p. 129. 

 Agnostus iuterstrictus, Wbite, p. 149. 

 Olenellus iddiugsi, Walcott, p. 170. 



gilberti, Meek, p. 170. 

 Olenoides nevadeusis, Meek, p. 181. 



spinosus, Walcott, p. 184. 



? flagricaudus, Wbite, p. 185. 



quadriceps, H. & W., p. 187. 



wasatchensis, H. & W., p. 189. 

 Ptycboparia kingi, Meek (sp.), p. 193. 



quadrans, H. & W., p. 199. 



f prospectensis, Walcott, p. 202. 



subcorosiata, H. & W.,p. 205. 

 Anomocare ? parvum, Walcott, p. 209. 

 Bathyuriscus productus, H. & W.,p. 217. 

 Asapbiscus wbeeleri, Meek, p. 220. 



A discussion of several of the genera is also presented. 



In a paper on the stratigraphic position of the Olenellus fauna Mr. 

 C. D. Walcott reviewed the stratigraphic position of the fauna de- 

 scribed in Bulletin 30 of the U. S. Geological Survey, and referred the 



1 Second contribution to the studies of the Cambrian faunas of North America. U. S. Geol. Survey, 

 Bull. No. 30, 1886. 



