164 



University of California Publications. 



[Geology 



remains of the two being found associated in the Quaternary 

 deposits of Samwel Cave. 



While resembling Euccratherium in general, the cranium and 

 horns are markedly different in many respects. These differ- 

 ences seem to warrant the placing of the new type in a distinct 

 genus for which the name Preptoceras is proposed. 



preptoceras sinclairi, new genus and species.* 



Pis. 24 and 25. 

 Type. — Specimen No. 8896, Univ. of Cal. Palaeont. Coll. 



Generic characters. — Horn-cores solid, on the posterior ex- 

 tremity of the frontals, well back of the orbits and rather widely 

 separated. Frontals rising at a steep angle from nasals to form 

 a greatly swollen area between and high above the orbits. Lach- 

 rymal pit broad and shallow. Teeth hypsodont, large, without 

 cement, superior molars with very small median accessory style 

 on the inner sides. Horn-cores with distinct burrs at the base. 



Specific cliaracters.— Proximal third of horn-cores flattened 

 anteriorly. Proximal third directed outward and slightly up- 

 ward, distal third curving forward and downward with an 

 elevated point. Occiput with no median keel above foramen 

 magnum. 



Occurrence. — The type specimen was discovered by the writer 

 in Samwel Cave on the McCloud River, Shasta County, Califor- 

 nia. It consists of the greater part of the skeleton of a young 

 individual. The skull lacks the median portion. This region is, 

 however, represented in another individual. The superior denti- 

 tion is complete on the left side. The left ramus of the mandible 

 was in articulation with the skull, as were also the cervical 

 vertebrae. 



The remains were excavated from a shallow deposit in the 

 deepest chamber of the cave, at a depth of six inches to two feet 

 The bones were more or less covered by stalagmite varying in 

 thickness from one to twenty-five millimeters. A large quantity 

 of material from the same deposit is referable to this genus and 

 to Euceratlierium. 



t 1 take pleasure in naming this species in honor of Dr. Wm. J. Sinclair, 

 who was identified with the first extensive cave exploration in California. 



