240 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA. 



nenco of the tuberosity external to the proximal articular facet; in this char- 

 acter it is, however, not distinctly different from C. occidentalis. 



As nearly as can be determined, relatively small size of the proximal pha- 

 langes obtains in the hind feet, as in the anterior extremities. 



MEASUREMENTS OF IMPORTANT SKELETAL PARTS 



The following measurements are taken from skeletal elements representing individuals 

 of relatively large size. It is not certain that any two of the elements chosen represent the 

 same individual. 



Atlas, greatest transverse diameter 120.5 mm. 



Axis, greatest anteroposterior diameter of neural spine 73.7 



Scapula, greatest height 201 



Pelvis, greatest length 228 



Humerus, greatest length 240 



Radius, greatest length 220 



Metacarpal four, greatest length 90.5 



Femur, greatest length 260 



Tibia, greatest length 237 



Metatarsal four, greatest length 102.3 



COMPARISON OF RANCHO LA BREA SPECIMENS WITH PREVIOULY KNOWN 



MATERIAL 



Comparison with the Type Specimen. In order to fix the systematic posi- 

 tion of the California species satisfactorily it was considered of the utmost 

 importance to make a comparison with Leidy's type specimen. Mr. Witmer 

 Stone of the Philadelphia Academy of Natural Sciences responded most cor- 

 dially to a request for the loan of the original specimen, making it possible to 

 compare the California collection with the type. 



As a result of the comparison of the type with a large number of the speci- 

 mens from the asphalt deposits, there appears to be no essential difference 

 between the Indiana and the California forms. Such differences as exist are 

 hardly greater than the minor individual differences among California speci- 

 mens evidently representing one species. 



In the type specimen (pi. 25, fig. 3) the form of M 1 , the most important 

 tooth of the upper dentition, differs from that of the other wolves and resem- 

 bles the California specimens in the extreme reduction of the hypocone. The 

 form of this tooth is in general similar in the Indiana and California forms. 

 If any difference is noticeable, it is in the slightly wider bases of the paracone 

 and the metacone, and in the distinctly concave posterior border of the average 

 California specimen. Numerous individuals are present in the California 

 collection in which the outer pair of tubercles does not show a broader base 

 than in Leidy's type. The posterior border of most of the California specimens 

 is generally rather sharply concave immediately behind the depression for 

 the reception of the hypoconid of Mi. In the type the posterior border is very 



