294 ! Vertebrata. 6. Mammalia. 



Ctenacodon nanus n. sp. 0. C. Marsh. From the Atlantosaurus Beds of Wyoming. 

 The Am. Journ. of Sc. New Haven. 1881. p. 512. 



Allodon n. g. 0. C. Marsh. Five premolars and two molars, in front of this series 

 is a single alveolus which is occupied by a small premolar or perhaps by a weak 

 canine. Premolars have each two fangs, and tuberculated crowns, which are nearly 

 flat on the inner side and rounded externally. The two true molars strongly re- 

 semble those of Microlestes and hence are similar in form to the lower molars of 

 Plagiaulax and Ctenacodon. Allodon laticeps n. sp. Marsh, found in the Upper 

 Jurassic deposits of Wyoming. The Amer. Journ. of Sc. New Haven. 1881. 

 p. 511. 







