THE MAMMALIA OF THE DEEP RIVER BEDS. 



71 



The cerebellum does not differ in any important respect from that of recent dogs, 

 except that it is less extensively covered by the hemispheres. The vermis is promi- 

 nent and well convoluted, and is principally extended upon the dorsal side. The 

 lateral lobes are somewhat injured by weathering, so that the degree of their convo- 

 lution is not apparent. 



In the subjoined table, comparative measurements are given of the skulls of 

 Oynodesmus, Temnocyon coryphaeus and Canis latrans. Under each species, the first 

 column gives the actual dimensions in millimeters, while in the second column are 

 the proportionate measures, by Huxley's method, the length of the basicranial axis 

 in each case being taken as 100. These figures are calculated only to the nearest 

 integer, the fractions representing amounts which are far within the limits of indi- 

 vidual variation. 



Cynodesmus. 

 M. Axis = 100. 



Length of basicranial axis 066 100 



Total length of skull 147 223 



Length of face 048 73 



Length of zygoma 074 112 



Width across zygomas 106 161 



Length upper inolar-premolar series 052 79 



Length of upper sectorial 015 23 



Width of upper sectorial 011 17 



Length of first upper molar 011 17 



Width of first upper molar 016 24 



Length of second upper molar 007 . 11 



Width of second upper molar 010 15 



Width of palate at p. 4. 043 65 



Length of auditory bulla 024 37 



Length of mandible 113 171 



Length of first lower molar 017 26 



Length of second lower molar 008 12 



Length of third lower molar 005 8 



C. LATRANS. 



M. Axis = 100. 



T. CORYPH/EUS. 



M. Axis = 100. 



.061 

 .161 

 .073 

 .072 

 .098 

 .069 

 .020 

 .009 

 .013 

 .017 

 .008 

 .012 

 .052 

 .023 

 .130 

 .021 

 .010 

 .005 



100 

 264 

 120 

 119 

 161 

 113 

 33 

 15 

 21 

 28 

 13 

 20 

 85 

 38 

 212 

 34 

 16 



066 

 153 

 056 

 074 



055 

 017 

 011 

 010 

 016 

 004 

 009 

 050 

 027 



100 

 234 



85 

 112 



83 

 26 

 15 

 15 

 24 

 6 

 14 

 76 

 39 



It should be added that, in Cynodesmus, the length given for the basicranial axis is 

 approximate only, the margins of the foramen magnum being broken away, but the 

 error cannot be sufficient to detract from the substantial accuracy of the results. 

 This beautiful specimen was found in the lower beds of Deep River valley by 

 Prof. O. C. Mortson. 



The Systematic Position of Cyjstodesmus. 



Of the phylogeny of the Canidce, which has so long remained obscure and puzz- 

 ling, Schlosser says : " Die Abstammung des Hundes ist noch immer mehr oder 

 weniger in Dtinkel gehullt. Es sind zwar eine grosse Menge fossiler Fleischfresser 



A. P. S. — VOL. XVIII. J. 



