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University of California Publications. 



[Geology 



backward and inward from the orbits. A short distance above 

 the base the horn cores flare or widen slightly in the direction of 

 greatest diameter in cross-section. Outer anterior edge of the 

 horn core arising over the upper posterior region of the orbit, 

 and swinging backward with a suggestion of a twist. Surface of 

 the horn core comparatively smooth, with a few pits or irregu- 

 larities. Texture of the outer portion of the horn core solid. 

 Supraorbital foramina present in front of the middle of the 

 antero-medial side of the base of the horn cores. 



Fig. 7. — Sphenophalos nevadanus. Outer side of left horn core and 

 orbital region; 7s, cross-section of horn core. No. 11887, type sepcimen, 

 natural size. 



The type specimen (fig. 7) consists of the basal portion of the 

 left horn with a portion of the frontal extending forward over 

 the orbit, and backward to form a small portion of the brain case. 

 A second specimen, no. 11888, includes the bases of both horns 

 with portions of the orbits and brain case, and represents an 

 individual a little smaller than the type. 



