NO. 5 UPPER CAMBRIAN TRILOBITES RESSER 6l 



The large glabella tapers at a normal rate to the rounded front. It 

 lacks furrows and even the occipital furrow is very faint. The fixi- 

 genes average less than half the glabellar width, expanding to the 

 moderate anterior angles, and behind the eye into stout posterolateral 

 limbs. Eyes are small, situated about the midpoint of the cranidium. 

 The rather heavy, somewhat upturned rim is about the same width as 

 the preglabellar area. When exfoliated, the pygidium shows a long 

 axis on which at least six rings are faintly indicated. As a whole, the 

 pygidium is triangular in outline. In cross section the curvature is 

 gentle, except near the margins where the slope increases so much 

 that the outer edges are slightly turned under. 



Warrior limestone; (loc. 38e) i mile northwest of Benore, 5 miles 

 west of State College. Pennsylvania. 



Holotype.—U.S.'NM. No. 108788a; paratypes, Nos. 108788b, c. 



BLOUNTIA (?) DISPARILIS, new species 

 Plate 14, Figures 10, 11 



This narrow cranidium is not typical of Blountia. The glabella 

 tapers to a rounded anterior outline and lacks glabellar furrows. A 

 shallow occipital furrow separates a narrow neck ring. The fixigene 

 is narrow, averaging about one-third the average glabellar width. The 

 wide brim is subdivided into a preglabellar area and a wider rim. The 

 rim is thickened and increases in the middle to about twice the width 

 of the preglabellar area. Eyes small. Longitudinally the cranidium 

 attains considerable convexity by rather strong curvature in the rear 

 portion. In cross section the curvature, including the posterolateral 

 limbs, is more even. 



Sullivan formation ; (loc. 64h) Glacier Lake Canyon Valley, 48 

 miles northwest of Lake Louise, Alberta. 



Holofype.—lJ. S. N.M. No. 108775. 



BLOUNTIELLA Resser, 1938 



BLOUNTIELLA ALBERTA, new species 



Plate 14, Figures 19-26 



Although this species is represented by numerous cranidia, the 

 pygidium has not been located. Taken as a whole, the cranidium is 

 rather short, and the glabella occupies most of its cranidial area. 

 Glabellar furrows are lacking even in exfoliated specimens. The fixi- 

 genes average less than half the glabellar width. The eyes are small, 

 situated about the midpoint of the cranidium. A narrow preglabellar 

 5 



