34 SMITHSONIAN iMISCEI.I.ANEOUS COLLF.CTIOXS VOI,. IO3 



rather wide and depressed at the anterior angles. The eyes are of 

 moderate size and not greatly bowed. The associated libragene has a 

 heavy, striated rim, so constructed that it shows the suture to be 

 intermarginal for more than one-third the width of the head. Ocular 

 platform rather small, and covered with anastomosing lines similar 

 to the elevated portions of the cranidium. 



Honey Creek limestone; (loc. 91s) West Timbered Hills, Arbuckle 

 Mountains, Oklahoma. 



IIolotype.—U.S.NM. No. 108681a; paratype No. 108681b. 



DRUMASPIS NITIDA, new species 

 Plate 5, Figures 34, 35 



This species is represented by several cranidia. The wide, nearly 

 quadrate glabella is well rounded in front. All the furrows are 

 moderately developed. The brim is normal in width and consists of 

 a narrow preglabellar area, and a slightly thickened rim which 

 broadens toward the middle. The fixigenes are narrow, at their 

 widest point being little more than one-fourth the glabellar width. In 

 their anterior portions they are about the same width as the brim, but 

 widen toward the depressed anterior angles. The eyes are somewhat 

 larger than average size and slightly bowed, the bowing attained by 

 a sharp angular turn near the midpoint. A distinctive feature is the 

 extraordinary width of the eye band. Surface covered by irregular 

 raised lines which are equivalent to irregular curved granules. 



Honey Creek limestone; (loc. 91s) West Timbered Hills, Arbuckle 

 ^Mountains, Oklahoma. 



IIolotype.—V.S.NM. No. 108682. 



DRUMASPIS UTAHENSIS, new species 



Plate 5, Figures 31-33 



In the National Museum collections are several cranidia which 

 when first studied were thought to belong to Chariocephalus. How- 

 ever, when comparison was made with typical forms of that genus 

 and of Drumaspis, they appeared to be nearer the latter. 



The quadrangular glabella has a straight anterior margin and 

 rounded anterior angles. The glabellar furrows are well developed, 

 and even the anterior pair may be traced across the glabella. In cross 

 section the glabella stands completely, but not high, above the dorsal 

 furrow and is nearly flat on top. Longitudinally the relief is con- 

 siderable, but the curvature is nowhere great except in the very front 

 of the cranidium. The fixigenes are wide, being half the glabellar 



