10 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



The glabella is quadrate, being rounded slightly at the anterior 

 corners. The dorsal furrow is wide and rather deep and has pits at 

 the anterior angles. The occipital furrow is wide and deep, but the 

 glabellar furrows are faint, the rear pair showing only as faint 

 depressions. The fixigenes are slightly less than half the width of 

 the glabella. The eyes extend far forward, terminating about a half 

 millimeter behind the dorsal furrow pits. The brim consists of a 

 slightly thickened narrow bar. 



Honey Creek limestone (Ptychaspis beds) ; (loc. 9y) 2 miles south- 

 east of Canyon Creek, Wichita Mountains, Oklahoma. 



Holotype.—V.S.'NM. No. 108638. 



CHARIOCEPHALUS MONTIS, new species 



Plate i, Figures 32-34 



Only a few cranidia of this small species have been located. 



The glabella is practically rectangular in outline with the anterior 

 corners rounded. In the exfoliated holotype the furrows are so 

 shallow that they presumably did not show on the exterior surface. 

 The brim consists of a rather stout, slightly thickened bar. The dorsal 

 furrow is wide and fairly deep. The fixigenes at their widest point are 

 a little more than one-third the glabellar width, while the anterior 

 fixigenes are about as wide as the eye band. The eyes are very long, 

 extending from the occipital furrow to a point beyond the sides of 

 the glabella, and are highly bowed with a fairly even curvature. The 

 glabella is rather evenly curved laterally, and longitudinally the rate 

 of curvature increases from the rear pair of the glabellar furrows 

 forward. The fixigenes are rather flat, sloping slightly downward 

 from the dorsal furrow. 



Honey Creek limestone (Ptychaspis beds) ; (loc. giq) 8 miles 

 southeast of Mountain View, Wichita Mountains, Oklahoma. 



Holotype— U.S.lsiM. No. 108639. 



CHARIOCEPHALUS WICHITAENSIS, new species 

 Plate 2, Figures 1-8 



This is one of the larger species and is represented by several 

 cranidia and other parts. The cranidium expands slightly and is 

 rounded at the anterior corners to the straight front outline. In fact, 

 the front of the glabella is slightly indented. The occipital furrow is 

 deep, but only the rear pair of glabellar furrows shows on the exterior, 

 while the other two pairs are faint on exfoliated specimens. The 

 glabella stands above the level of the fixigenes and its convexity 

 laterally is produced by a gently curving top and relatively steeply 



