36 SMITIISOMAX MlSCEl-I-ANKOUS COLLECTIONS VOL. IO3 



the preglabellar area. The fixigeiies, at the rear of the eyes, are about 

 half the glabellar width and form wide triangular posterolateral limbs. 

 Anterior to the rather small eye they are somewhat wider than the 

 brim. As the cranidium has no occipital furrow, it presents a very 

 smooth appearance. 



Hickory sandstone; (loc. 68z) T'acksaddle Mountain, ii miles 

 southeast of Llano, Texas. 



Uolotypi\— V.S.N. U. No. 108686. 



CHEILOCEPHALUS BUTTSI, new species 

 Plate ii, Figure 6 



Unfortunately many years ago the holotype and other cranidia 

 representing the species were damaged by poor preparation. This 

 cranidium is fully typical of the genus, even as to size. The large 

 glabella extends the full length of the head and has three pairs of 

 shallow furrows. It tapers only slightly. Though incomplete the 

 fixigenes are seen to be small anterior to the large posterolateral limbs. 

 Longitudinally the cranidium is little curved except in the anterior 

 fourth where the slope becomes vertical. In cross section the entire 

 head has considerable convexity attained b}' a rather evenly convex 

 glabella and continued by the lateral slopes of the fixigenes. 



Surface beautifully shagreened. 



Ore Hill limestone; (loc. lO/v) ^ "^i'e nortliwest of Drab, Penn- 

 sylvania. 



Holotype— V.S.N.M. No. 108746. 



CHOLOPILUS Raymond, 1924 



CHOLOPILUS NEVADENSIS, new species 



Plate 6, Figures 1-2 



The main features of this species relate it to Cholopilits. Further- 

 more its stratigraphic position is approximately the same as other 

 representatives of the genus. Numerous cranidia are in hand, hut 

 no other parts. 



C. nevadensis is characterized by its simplicity. The very large, 

 smooth glabella extends nearly to the anterior margin. The dorsal 

 furrow, fairly well impressed in the rear, decreases in depth forward 

 until beyond the eye it can be observed only as a very faint line 

 beneath the surface. A weak occipital furrow is developed but no 

 glabellar furrows show on the outer surface. Exfoliated specimens 

 have the merest trace of three pairs of glabellar furrows, the first pair 

 recurved, the second pair turning a bit forward, and the third again 



