NO. 5 CAMBRIAN TRILOBITES RESSER II 



Anoria utahensis, n. sp. 



Bathyuriscus productns Walcott (part), U. S. Geol. Surv. Bull. 30, p. 217, 

 pi. 30, figs. la, 1.(7, ih, 1886. 



Sorting of the material from this locahty identified as Bathyuriscus 

 producius in 1886 and referred to B. anax in 1916. revealed the fact 

 that neither mentioned species was present but that two other forms 

 represented species referable to two other genera. 



Besides the illustrated head and pygidia, many other cranidia are 

 in hand as well as pygidia typical of Anoria. 



Middle Cambrian, Ophir; (loc. 30a) i mile below Argenta Cotton- 

 wood Canyon, Wasatch Range, Utah. 



Holotype and paratypcs. — U.S.N.M. no. 15458. 



APHELASPIS, n. gen. 



A very abundant trilobite characterizing the upper beds of the 

 Cap Mountain formation was described by Shumard as Conocephali- 

 tes depressus. Recently, the genus has been found in beds of cor- 

 responding age in Wisconsin and possibly in the western United States. 



Diagnosis. — Cranidium rather long and narrow ; rather flat. Facial 

 suture diverges anterior to the eyes. Glabella narrow, slightly tapered ; 

 glabellar furrows very faint ; occipital furrow shallow but distinct. 

 Brim wide ; rim well defined, flat, usually somewhat upturned ; pre- 

 glabellar area more than twice width of rim ; usually rather convex. 

 Fixed cheeks only about one-third width of glabella ; eye lines clearly 

 developed, eyes moderate in size, situated about center of head ; palpe- 

 bral lobes strongly bowed, palpebral furrow distinct. Free cheeks 

 rather large, long, with long genal spines ; ocular platform swollen, 

 elongate. 



Pygidium short, wide ; axis arched high above pleural lobes, extend- 

 ing to rear margin ; three axial furrows clearly defined ; pleural fur- 

 rows less well developed. 



Genotype.— Conoccphalitcs depressus Shumard. 



Natne. — Atftcka = neat ; aaTns = shield. 



Range. — Upper Cambrian. Above Crepicephalus zone and below 

 fronton. 



Aphelaspis depressa (Shumard) 



Conocephalites depressus Shumard, Amer. Journ. Sci. 2d ser., vol. 32, p. 219, 



1861. 

 Ptychoparia depressa Miller, North Amer. Geol. Pal., 1889, p. 565, (gen. ref.). 



