128 Bulletin American Museum of Natural History. [Vol. XII, 



Cynodictis gregarius , length of skull, 76 mm. ; width of brain-case, 29, height, 

 22, length, 43 mm. ; proportion of length of skull to width of brain-case, 

 I :o.37 ; length of seven lumbars, 104 ; proportion of length of skull to that of 

 lumbar vertebrae, i : 1.37. 



Nothocyon geismariamis, length of skull, in mm. ; width of brain-case, 40, 

 height, 33, length, 52 mm. ; proportion of length of skull to width of brain- 

 case, I :0.37 ; length of seven lumbars, 155 ; proportion of length of skull to 

 that of lumbar vertebra, i : 1.39. 



Nothocyon urostictus, length of skull, 112 mm. ; width of brain-case, 45, 

 height, 35, length, 52 mm. ; proportion of length of skull to width of brain- 

 case, I : 0.41 ; length of seven lumbars, 129 ; proportion of length of skull to 

 that of lumbar vertebrae, i : 1.15. 



From the above proportions it appears that the John Day 

 species exhibits an important advance on the White River Cyno- 

 dictis in the increase in length of feet and decrease in their width. 

 The increase in the size and robustness of the species marks the 

 advance in brain capacity, and the lumbar region has not suffered 

 any proportionate reduction. In the modern species there is a 

 further increase in length of feet, the brain increases in capacity, 

 and the lumbar region is greatly reduced. The length of the 

 femur and humerus does not increase in proportion ; that of the 

 tibia increases slightly and of the radius considerably. 



Proportions, length 

 C. gregarius, N. geisniarianus. N. urostictus. of skull as unity. 



Length humerus. . 71 98 106 .93: .go: .94 



radius 55 ? 105 .72: ? : .94 



" femur.... 79 no 116 1.03:1.00:1.04 



" tibia 80 116 120 1.04:1.04:1.07 



The above measurements are from the complete skeletons of 

 C. gregarius (No. 8774), N. geismarianus (No. 6886), N. urostictus 

 (No. 391, Dept. Ost.). 



The longer-legged specirnens referred by Prof. Scott to C. gre- 

 garius may be referable to C. lippincottianus. These have the 

 limbs, especially the tibia and fibula, much longer than in C. 

 gregarius proper, but the feet apparently of the same size. 



VI.' — Analysis of the Miocene Genera of Canid^. 



It is doubtful whether some of these genera should rank as 

 such, the distinctions being probably of only subgeneric value. 

 They certainly represent well-defined groups, and it would be 

 difficult to invalidate one without invalidating nearly all. The 

 mere number of the teeth cannot be considered as a more im- 



