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University of California Publications. [Geology 



one of the rarer John Day carnivores. It is represented in the 

 University collections by two specimens, No. 9999, a young adult 

 with unworn teeth, and 1549, an old individual with teeth con- 

 siderably worn. No. 9999 shows the entire skull with the com- 

 plete upper and lower dentition, and the greater part of the 

 skeleton excepting the manus and the distal half of the pes. The 

 other specimen is a nearly complete cranium with all the ele- 

 ments of the upper dentition. The dentition of the mandible in 

 the first specimen corresponds very closely to that of Cope's type. 

 The upper dentition is nearer in form to that of Cope's type of 

 altigenis as figured than to any other species, with the exception 

 of the deuterocone of the carnassial. In this tooth our specimens 

 exhibit the heavy form of deuterocone seen in the type of T, 

 ferox. In Cope's specimen showing the upper jaw, the deutero- 

 cone of P 4 , though prominent, is represented as small, low, nar- 

 row, and not very sharply separated from the protocone. Al- 

 though this cranium was not associated with the type, the molars 

 show so close a resemblance to those of specimen No. 9999 that 

 there seemed to be good reason for believing that the deuterocone 

 of P 4 had not been correctly drawn. Dr. W. D. Matthew has 

 very kindly examined Cope's type of the cranium for me re- 

 cently to ascertain the true character of this tooth, and finds that 

 "the upper fourth premolar has a large, well separated deutero- 

 eehe. ' ' The molars of this specimen were found by Dr. Matthew 

 to be correctly represented. With this correction of the original 

 description of Temnocyon altigenis, specimens No. 1549 and No. 

 9999 approach this species very closely. The principal difference 

 being found in minor variations of the measurements as seen in 

 the table of measurements on page 29." Both of the specimens 

 used as types by Cope are slightly larger than the specimens in 

 our collection. 



The differences separating this species from the other mem- 

 bers of the genus Temnocyon may be expressed as follows: — 



T. ferox Eyerman. Largest known species. Length of skull 

 in type specimen 266 mm. Sagittal crest high. Deuterocone of 

 P 4 large and heavy, sharply separated from protocone, with an 

 incipient tubercle on the anterior side. P 3 with posterior basal 

 tubercle. M 1 with V-shaped protocone. M 2 with greatly reduced 

 metacone. P 4 practically equaling M 1 in length, with a distinct 



