412 



University of California. 



[Vol. 3. 



Euceratherium collinum Furlong & Sinclair. 

 Pls. 50 and 51; Text Fig. 1. 

 Pub. Univ. of Gal. Am. Arch, and Eth. Vol. 2, p. 18. 



Generic characters. — Horn-cores solid, situated close together 

 on the posterior extremity of the frontalis and far behind the 

 orbits. Frontals reaching to occiput, with strongly developed 

 pneumatic cavities extending into the bases of the horn-cores. 

 Parietal confined to occiput, forming no part of the cranial roof. 

 Lachrymal pit broad and shallow. Dental formula A, i, l, l. 

 Teeth hypsodont, large, without cement or accessory cuspules. 



Specific characters. — Horn-cores laterally compressed and 

 curved, elliptical in cross-section at the base, circular in cross- 

 section at the tip. Proximal half of horn-core directed upward 

 and backward, distal half outward and forward. Frontals 

 broadly convex above orbits, slightly inflated toward bases of 

 horn-cores. Occiput with sharp median keel above foramen 

 magnum. 



Occurrence. — The type specimen (No. M8751, Univ. of Cal. 

 Palaeont. Mus.) was discovered by Mr. Furlong in the Samwel 

 Cave, situated on the east side of the McCloud River, about 

 thirteen miles north of Baird, Shasta County, and 355 feet above 

 the river. It consists of a cranium without mandible, from 

 which a part of the right horn-core, the jugal process of the 

 right squamosal, and the extremities of the premaxillae and 

 nasals have been broken. The nasals and a part of the pre- 

 maxillae have been restored in plaster. The superior dentition 

 lacks only the first premolar on the left side. The cranium lay 

 on the surface of a deposit of ossiferous clay flooring a deep 

 vault in the cave, and was almost completely covered by a coat- 

 ing of crystalline stalagmite. The difficulty of preparing the 

 specimen for exhibition was increased by the chalky character 

 and extreme thinness of the bones of the skull, especially in the 

 frontal region where the pneumatic cavities are roofed over by 

 mere shells of bone. 



In the Potter Creek Cave, Euceratherium is represented by 

 abundant remains which have been found in all the bone-yield- 



