CAMBRIAN TRILOBITES — WAIXOTT 39 



with the horizon carrying Neoleniis serratus (Rominger) in British 

 Cokimbia/ in thin-bedded limestones of the Marjuni formation, in 

 ridge on east side of Wheeler Amphitheater, east of Antelope 

 Springs, House Range, Millard County, Utah, U. S. A. 



Genus BATH YURISCUS. Meek 

 BATHYURISCUS ORNATUS, new species 



Plate i, Figures 1-3 



Dorsal shield small for the genus, longitudinally oval in outline, 

 •moderately convex. Cephalon semicircular in outline; a little less 

 than one-third the length of the dorsal shield ; bordered by a narrow, 

 rounded margin that passes, at the rounded genal angle, into the 

 very narrow posterior border ; the interborder furrow is sharply 

 defined all about the outer border, and within the posterior border 

 it is a straight, rather broad, shallow furrow. Cranidium large, 

 with very small antero-lateral and large postero-lateral limbs ; the 

 former are nearly as long as broad and separated from the fixed 

 cheeks by the strong ocular ridges ; the postero-lateral limbs and 

 fixed cheeks merge into each other so as to form subtriangular areas, 

 with the narrow palpebral lobes on their front outer margins for 

 about one-third of their length ; the palpebral lobes are small, about 

 one-fourth to one-fifth the length of the cranidium and bordered 

 by a strong, narrow, rounded rim that extends across the fixed 

 cheeks to the dorsal furrow, beside the glabella. 



Glabella large, a little wider in front than at the occipital furrow 

 and with slightly diverging sides ; front broadly rounded ; surface 

 marked by four pairs of furrows, the posterior of which extends 

 obliquely inward across the posterior portion nearly to the center, 

 so as to separate a small subtriangular lobe on each side ; the three 

 anterior pairs of furrows are short, close to the dorsal furrow, and 

 about equal distances from each other. Occipital ring very narrow 

 at its ends, from where it broadens rapidly to its full width ; a short, 

 oblique furrow occurs on each side that is subparallel to the posterior 

 pair of glabellar furrows, that serve to separate the central portion 

 of the occipital ring from its end sections ; occipital furrow narrow, 

 distinct, transverse, and terminating in advance of the posterior 

 intermarginal furrows of the fixed cheeks. Free cheeks small, 

 elongate, and with rounded posterior angles ; eye lobes small. The 

 facial sutures cut the posterior margin just within the genal angle 

 and extend obliquely forward and inward with a slight sigmoid 



^ This British CoUimbia horizon is given in detail in the Formation and 

 locality of Burlingia Jicctcri. 



