NO. 5 CAMBRIAN TRILOBITES 381 



ORRIA ELEGANS, new species 



Plate 66, figs. 2, 2a-b 



The characters of this species are given in the description of the 

 genus Orria, and there is no other species of the genus with which 

 to compare it. Two nearly entire dorsal shields and many frag- 

 ments were collected from the dark shaly limestone forming ic of the 

 Marjum formation.^ The associated fauna, which is listed under 

 description of Marjumia typa (p. 402), is large and varied and indi- 

 cates a most favorable environment for the development and growth 

 of large trilobites. 



Formation and locality. — Middle Cambrian: (iiq) Marjum 

 formation; about 2,300 feet (707 m.) above the Lower Cambrian, 

 and 660 feet (203 m.) below the Upper Cambrian, in the limestone 

 forming ic of the Marjum formation, 2.5 miles (4 km.) east of 

 Antelope Springs, in west face of ridge east of Wheeler amphitheater, 

 House Range, Millard County, Utah. 



Genus ASAPHISCUS Meek 



Asaphiscus Meek, 1S73, Sixth Ann. Rept. U. S. Geol. Surv. Terr., p. 485, 

 footnote. (Founds genus on Asaphiscus wheeleri, then an unpublished 

 species, and comments on genus.) 



Asaphiscus Walcott, 1875 [1877], Twenty-eighth Rept. N. Y. State Mus. 

 Nat. History, doc. ed., p. 94, footnote. (Considers Asaphiscus as simi- 

 lar to Bathyurus. This is corrected in 1886.) 



Asaphiscus Walcott, 1879, Idem, p. 94, footnote. (Repeats preceding ref- 

 erence.) 



Asaphiscus Walcott, 1886, Bull. U. S. Geol. Surv., No. 30, p. 219. (Gives 

 Meek's description and with comments.) 



Asaphiscus Miller, 1889, North American Geol. and Pal., p. 530. (Meek's 

 description and figure of A. wheeleri.) 



Asaphiscus Grabau and Shimer, 1910, North American Index Fossils, Vol. 

 2, p. 289. (Brief note and figure of A. wheeleri.) 



Dorsal shield subelliptical, moderately convex, distinctly trilobed. 

 Cephalon semicircular in outline with genal angles rounded or pro- 

 longed into spines of moderate length; border rounded, strong and 

 clearly defined all about the cephalon ; glabella subconical in outline, 

 rounded convex and with only slight traces of a pair of oblique 

 posterior lateral furrows and two pairs of short, faint anterior fur- 

 rows ; occipital furrow shallow and only faintly separating the gla- 

 bella and occipital ring; fixed cheeks about one-half the width of 

 the glabella, posteriorly they merge into a rather large postero-lateral 



^ Smithsonian Misc. Coll., Vol. 53, 1908, pp. 179-180. 

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