350 University of California Publications in Geology [Vol. 12 



the tooth ti"ansversely into an anterior and a posterior half. This 

 character is commonly developed in teeth of N othr other ium, the groove 

 being absent in Hapalops of the Sonth American Miocene. While the 

 tooth considerably resembles the two anterior cheek teeth of the lower 

 jaw in N othrotlicrium of the California Pleistocene, the species which 

 this tooth must represent would be so far removed in time from the 

 latter that the specimen (no. 23374) may have been of either the 

 upper or lower series. 



]VIEGALONYX( ?), sp. 



Material. — A cheek-tooth Univ. Calif. Coll. Vert. Pal. no. 23371 (figs. 57a- 

 57c0, Univ. Calif, loc. 3269. 



Description. — The tooth is considerably larger than the foregoing 

 specimen, and greatly different in form: (1) in the relative broadness 

 and narrowness of its transverse extremities. (2) in tlie roundness of 

 the inner and outer corners, and (3) in the lack of the marked 

 tendency to transverse subdivision into anterior and posterior halves. 

 The specimen is somewhat larger than that of the megalonychid 

 spechnen (no. 23373, figs. 29a-29?;) from tlie overlying formation and 

 its triturating surface is differently worn. Except for its slightly 

 smaller size the tooth resembles a tooth of Mcgalonyx from the Potter 

 Creek Cave. The Eden specimen might represent either the second 

 or third tooth of the upper jaw. 



Measurements 



No. 23.374 No. 23371 



Greatest transverse diameter of molar crown 11.6 mm. 18.8 mm. 



Greatest anteroposterior diameter of molar crown 15.8 12.3 



DiCOTYLIXAE 



The collection contains specimens of upper and lower cheek teeth 

 and canines. The cheek teeth are of definite Prosthennops character. 

 The canines are believed to be too large for association with the other 

 teeth, or inclusion within the genus Prosthennops as at present defined. 

 They are tentatively referred to Platygonus. 



PEOSTHENNOPS EDENSIS, n. sp. 



Type. — F- to M- contained in a fragment of the maxillary (fig. 58), Univ. 

 Calif. Coll. Vert. Pal. no. 23369, Univ. Calif, loc. 3269. 



