NO. 5 UPPER CAMBRIAN TRILOBITES RESSER 55 



BYNUMIA RANGERENSIS, new species 

 Plate 9, Figures 37-41 



This well-represented species is allied to B. eiiinus in size and pro- 

 portions of the glabella. In cross section the brim, and to a lesser 

 degree the glabella and posterolateral limbs, are highly convex. Longi- 

 tudinally the convexity is not great, except in the swollen brim. The 

 brim width is less than half the glabellar length. The rather large 

 associated pygidium is nearly flat in cross section, but in the opposite 

 direction has increasing curvature in the posterior moiety. 



Sullivan formation; (loc. 66L) Ranger Brook Canyon, Sawback 

 Range, Alberta. 



Holotype. — U.S.N.M. No. 108728a; paratypes, Nos. 108728b, c. 



BYNUMIA SAWBACKENSIS, new species 

 Plate 9, Figures 42-44 



This large, well-represented species is characterized particularly by 

 its wide brim, which exceeds half the glabellar length. Not only is 

 the brim wide, but when viewed from the front comes to a blunt, 

 nearly cylindrical point. The pygidium has a blunt rear margin, 

 reached by the faintly outlined axis. 



Sullivan formation; (loc. 64W) Ranger Brook Canyon, Sawback 

 Range, Alberta. 



Holotype— U.S. '^M. No. 108729a; paratype. No. 108729b. 



BYNUMIA (?) MODESTA, new species 

 Plate 8, Figures ^t,, 34 



This species lies between Bynuniia and Kiiigstoiiia and should 

 possibly be referred to the latter genus. 



The glabella is large and relatively wide, so that it occupies by far 

 the greater portion of the cranidium. The front outline is strongly 

 curved but does not come to such a sharp point as in other species. 

 Longitudinally the cranidium is convex with an even curvature. It is 

 also convex laterally, but this convexity is attained by a sharp bend 

 along the median line causing the glabella and posterolateral limbs, 

 as well as the palpebral lobes, to slope down sharply on each side. The 

 steeply inclined halves of the cranidium are only a little curved in 

 themselves. The eyes are small and are situated well forward. A 

 narrow rim is visible in front. 



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

 miles northwest of Lake Louise, Alberta. 



Holotype.— V .S.'N .M. No. 108717. 



