24 Bulletin American Museum of Natural History. [Vol. XIV, 

 Sinopa agilis {Marsh). 



Limnocyon agilis MARSH, Am. Jour. Sci. 1872, Vol. IV, p. 202 (published 

 Aug. 7). 



Stypolophus brevicalcaratus CoPE, Pal. Bull. No. 3 ; Proc. Am. Phil. Soc. 

 1872, p. 469 (published Aug. 7) ; Tert. Vert., p. 291, pi. xxiv, fig. 9. 



From the Bridger Beds, Wyoming. 1 have preferred Prof. 

 Marsh's name for this species as based on a much more com- 

 plete specimen, including upper and lower teeth and many parts 

 of the skeleton. The type of 6". brevicalcaratus is a fragment of 

 the lower jaw with mg^s- Prof. Cope's determination of the 

 teeth as mj_2 is, I think, incorrect. 



This species, of medium size, is very close to 6". whitice but 

 may be distinguished by the smaller heels of the lower molars, 

 especially of mj. It may prove to be identical with 6". rapax 

 Leidy. 



Sinopa pungens {Cope). 



Stypolophus pungens CoPE, Pal. Bull. No. 2 ; Proc. Am. Phil. .Soc. 1872 

 (Vol. XII), p. 460 (Aug. 3) ; Tert. Vert., p. 291, pi. xxiv, fig. 8. 



Type of the genus Stypolophus. Bridger Beds, Wyoming. A 

 rather primitive species of medium size with long tricuspid heel 

 on nig-, approaching PalcRosinopa. Trigon not very high. Rep- 

 resented by a lower jaw fragment, No. 5015, Cope Collection, 

 Amer. Mus. Nat. Hist. 



[? Sinopa insectivora {Cope).\ 



Stypolophus insectivorus Cope, Pal. Bull. No. 3 ; Proc. Am. Phil. Soc, Vol. 

 XII, 1872, p. 469. 



Bridger Beds, Wyoming. The type of this species has been 

 lost or mislaid and its position in the genus cannot now be de- 

 termined. Prof. Cope's figures in Tertiary Vertebrata are evi- 

 dently incorrect, the outline of the tooth as viewed from within 

 and from without being different. 



[Sinopa aculeata (C^/^.)] 



Triacodon aculeatus Cope, Pal. Bull. No. i ; Proc. Am. Phil. Soc. 1872, 

 Vol. XII, p. 460. 



Stypolophus aculeatus CoPE, Ext. Vert. N. M. Rep. Wheeler Survey, IV, 

 ii, 112. Not S. aculeatus, Tert. Vert., p. 299. 



