the Marsh Collection, etc. 427 



Scott (1898) shows in his table on page 373 that his spec- 

 imens range in length from 86 to 92 mm. and in width 

 of brain-case from 31 to 35 mm. Nearly all of the Yale 

 specimens, as well as Cope's, are within the limits of 

 Scott's table. This shows a difference of from 13 to 21 

 per cent in skull length, and yet the length of the superior 

 and inferior tooth-rows, either premolar-molar series, or 

 each individually, does not differ by more than 1 mm. in 

 Y.P.'M. Cat. No. 12678 (corresponding to Matthew's 

 dimensions of No. 8774, A. M. N. H. ) from the larger 

 specimens which fall within the lower limits of Scott's 

 table. I can detect no differences, other than size, 

 between the smaller and the larger specimens, and the 

 ratios seem to be uniform. These smaller individuals 

 may represent a new variety, or they may be females. 

 Y. P. M. No. 12678 is fully adult. 



There are several Y. P. M. specimens in which M 3 pos- 

 sessed two roots, while others show but one root. Those 

 having the two-rooted M 3 do not appear to be any more 

 robust than the others. In fact, Y. P. M. No. 12691 has 

 two roots on this molar and yet it is of the same slender 

 proportions as the small skull and jaws bearing the 

 number 12678. I fail to find any other marked distinc- 

 tions between the two forms. Another specimen, No. 

 12687, from Scott's Bluff, Nebraska, shows very distinctly 

 the alveolus of the double-rooted M 3 . A part of a ramus, 

 No. 12689, possesses a small posterior cusp, together with 

 the usual posterior and anterior basal tubercles on P 2 , a 

 character possessed by C. oregonensis Merriam. 



Cynodictis lippincottianus (Cope). 



Syn. : Canis lippincottianus Cope 1873B, p. 9; Galecynus lippincottianus 

 Cope 1884, p. 919; Amphicyon gracilis Leicly (non Pomel) 1856, p. 90 (nom. 

 preoc.) ; Dapltcenus gracilis Eoger 1896, p. 44; C. hylactor Hay 1899, pp. 

 253-254. 



This species, founded by Cope, was based on several 

 rami from Colorado found in Middle Oligocene strata. 

 Cope stated (1884, p. 920) that the "Dimensions [were] 

 half as large again as in C. g re gar his, as indicated by 

 many specimens of the latter," while Wortman and 

 Matthew (1899, p. 130) found from the type that the 

 teeth were one fifth greater in lineal dimensions and 



