with Descriptions of New Forms. 167 



Measurements. 

 (Cat. Xo. 10064, Y. P. M.) 



mm. 



Total skull length, partly estimated 157 



Bizygomatic diameter, partly estimated 77 



Diameter of postorbital constriction 30 



Length of superior premolar series 44 



Length of superior molar series 20 



(Cat, Xo. 12714, Y. P.M.) 



Length of inferior dental series, C-M 3 inc 72 



Length of inferior premolar series 34 



Length of inferior molar series 27.5 



Ant.-post. diameter of M 1 14.5 



Ant. -post, diameter of M 2 8 



Ant.-post. diameter of M 3 4 



Temnocyon altigenis Cope. 



This comparatively rare species is represented in the 

 Marsh Collection by a fully adult skull, Cat. No. 10065, 

 Y. P. M., and other material. This specimen corresponds 

 with CojDe 's type, and possesses the zygomata and cranium 

 which were lacking in his specimen and which have been 

 heretofore undescribed. It varies somewhat from the 

 individuals described by Merriam (1906, pp. 21-29), as 

 will be seen from a comparison of measurements. 



The condylar foramen is small, while the foramen 

 lacerum posterius is large. The eustachian opening and 

 the external carotid foramen are separate. The optic 

 foramen is large. The infra-orbital foramen is larger 

 than in any specimen of Canis familiaris of equivalent or 

 even of somewhat larger size. 



The palatonarial border lies 8 mm. posterior to M 2 . 

 The zygomata are slender in proportion to the size of the 

 skull, absolutely weaker than in C. familiaris of equiva- 

 lent size, and less expanded. The cranium is large and 

 full, while the postorbital constriction is well marked. 

 The sagittal crest is well defined. The very marked 

 medial frontal depression, seen in C. familiaris, is totally 

 lacking in this species. 



The deuterocone of P 4 is very large and heavy and is 

 separated by a deep valley from the protocone. Nor- 

 mally P 3 has no posterior tubercle, but this specimen 



