NO. 5 UPPER CAMBRIAN TRILOBITES RESSER 3I 



DRUMASPIS SABINENSIS, new species 



Plate 5, Figures 10, 11 



This distinctive species is represented only by a few cranidia. 



The rectangular glabella is rather long and rounded at the anterior 

 angles. Both laterally and longitudinally it has average convexity for 

 the genus. The moderately wide brim is made up about equally of 

 anterior furrow and rim. The rim has a horizontal position and 

 widens out in the middle. The fixigenes, at their widest point, are less 

 than one-third the glabellar width. Their anterior portions are turned 

 down sharply, leaving a small ridge which extends into the preglabellar 

 area. The eyes are of moderate size and moderately bowed. 



Sabine formation; (loc. 17s) Sabine Mountain, 2 miles northeast 

 of Canal Flats, Brisco Range, British Columbia. 



Holofypc— V.S.N. M. No. 108676. 



DRUMASPIS MAXWELLI, new species 



Plate 5, Fk.ures 12, 13 



About a dozen cranidia of this species are available. 



The glabella is of normal shape and proportion, rounded at the 

 anterior corners. The usual glabellar furrows are present but not 

 deeply impressed. In cross section the glabella stands completely above 

 the fixigenes and dorsal furrow, rising steeply on the sides, but is 

 flattened on top. Longitudinally the cranidium is considerably arched, 

 the convexity increasing from the rear forward. The brim is of 

 normal width and upturned to a slightly thickened brim, which in the 

 holotype cranidium is partly broken off. Fixigenes are narrow, being 

 little more than one-fourth the glabellar width. Their anterior portion 

 is about as wide as the brim and is turned down at the anterior angles. 

 The eyes are of moderate size and slope outward at a small angle. 



St. Charles limestone; (loc. 66z) St. Charles Canyon, Bear River 

 Range, Idaho. 



Holotype— [J. S.N.M. No. 108677. 



DRUMASPIS DECKERI, new species 



Plate 5, Figures 14-16 



Even though the available material is confined to the illustrated 

 holotype, the species is so distinctive that it merits description. The 

 quadrangular glabella is rounded at the anterior angles and slightly 

 indented in front. Glabellar furrows developed as usual, the rear 



