166 C. D. WalcoM — Cambrian Fossils from Jtft. Stephens. 



however, is unlike that of the latter, being more closely related 

 to that of P. Kmgi Meek. 



Ogygiaf Klotzi Rominger. — This is a fine, large species, 

 and distinct from any known to me from the Cambrian ter- 

 rane. It is more a type of the second fauna than of the first ; 

 and its reference to the genus Ogygia is in accord with its gen- 

 eral characters. It differs, however, in the important feature 

 of having an ocular ridge extending from the anterior margin 

 of the eve to the dorsal furrow, beside the glabella. The pal- 

 pebral lobe is also more narrow and elongate than the eve of 

 most species referred to Ogygia. All other parts of the head, 

 thorax and pygidium relate it more closely to Ogygia than to 

 any other genus. The oldest known species of the genus, 0. 

 Selwyni Salter, from the Arenig terrane of Wales, is not 

 quite so closely related in form to 0. ? Klotzi as to the <9. 

 Jj'i'chi from the Llandeilo terrane. 



It is unusual that a genus, showing bo little variation from 

 Ogygia. occurs at a much lower horizon in an area separated 

 by over 5,000 miles, from- the area where the species of Ogygia 

 nourished at a later period in geologic history. 



Agnostus interstrictus White = Agnostus Rominger. — This 

 species of Agnostus is very abundant at Antelope Spring, 

 Utah, where it is associated with Olenoides JTevadensis, as at 

 Mt. Stephens. 



Acrotreta gemma Billings. — The broad, low form of this 

 species occurs compressed in the shaly slate. The specimens 

 at hand are poor, but they appear to be identical with those ' 

 from the Cambrian horizon at Pioche, Xevada. 



Kutorgvna Prospeetensis Waleott ?. — A fragment of a species 

 of Ivutorgina. closely related to K. Prospeetensis, occurs on the 

 slate in association with Ptychoparia GordiUerm. It is not 

 improbable that it represents a new species. 



HyoUtheUvs mieam Billings. — Black, shiny, concentrically 

 striated or smooth, compressed tubes occur in the shale with 

 the trilobites. that appear to be identical with H. micans of 

 the Middle Cambrian fauna of Xew York, Yermont and 

 Canada. The ,; slender stems," mentioned by Dr. Rominger, 

 may be the same as the slender shells of this species which 

 appear like compressed steins formed of shiny carbonaceous 

 matter. 



It is doubtful what the specimen identified as Jfenocephalus 

 Salteri ? is. It may be the young of Bathyuriscus HoweJM. 

 The specimen figured as Bathyurus ? is too badly defined to 

 identify it. It certainly does not belong to the genus Bathyu- 

 rus. Of the remaining genera mentioned by Dr. Rominger I 

 do not find any traces in the material before me with the ex- 

 ception of a fragment of a species of Orthis. 



