2IO Bulletin American Museum of Natural History. [Vol. X, 



ISERTiE SeDIS. 



23. C. marginatus Cope. 



Type, No. 4374, Am. Mus., Cope Coll. Superior molar 3, canine and pm. 

 Loc, Big Horn, Wyoming. 



'I'his indeterminate type resemble.s C. artnatus in the form of 

 m-, but differs from it in the form of the canine, which is less 

 compressed and may possibly represent a milk tooth. The canine 

 corresponds with Cope's description of that of C. simus. 



WIND RIVER TYPES. 



Cope's Wind River material of Corypliodo/i, all of which is now 

 in the American Museum (Nos. 481 1, fragments of skull and 

 teeth ; 4812, lower molar, incisors and fragments ; 4813, lower 

 jaw and fragments ; 4814-4817, fragmentary teeth ; 4818), merely 

 sufficed to determine the existence of this genus in these beds. 



Our Wind River collection and the determination of manus 

 No. 4351 (Am. Mus., Cope Coll.) as belonging to the Wind River 

 Beds, is therefore of very great importance. It demonstrates that 

 Coryphodouts of considerable diversity and size persisted into the 

 Wind River period. 



Owing to the general scarcity of fossil remains in these beds, 

 the relative abundance of these animals cannot be estimated. Of 

 intermediate size is the jaw of No. 2976, described below as C. 

 ventanus ; of smaller size there is a well-preserved skull (No. 2977), 

 type of the new species C. wortmani. They represent respec- 

 tively the persistence of at least two series, namely of Series I, and 

 of Series III now discovered for the first time. 



Successors of Series II. 

 26. Coryphodon ventanus, sp. nov. 



Type, No. 2976, Am. Mus. Coll. Jaws and lower teeth. .Superior incisors 

 and canine. L. metacarpal IV. 



Definition. — Size of C. testis ^. Inferior m and pm series = t' 172. Supe- 

 rior canines posteriorly compressed, with antero-internal depression and long 



