172 Bulletin American Mjiseum of Natural History. [Vol. X, 



Protolambda,' gen. nov. 



Type. — Four isolated upper molars. Loc, Laramie. Am. Mus. Coll., Nos. 

 2201-3. 



DcJi>iitiou. — Superior molars with open trigon and elongate outer wall. 

 Paracone and metacone laterally compressed. Conules subcrescentic. Para- 

 style prominent. 



P. hatcheri," sp. nov. 



With rudimentary spur, metastyle on posterior external border. 

 Type, as above. Fig. \, A. 



The lower molars HI 3^\A At, in Fig. i, probably are associated with this 

 type. 



mesostyle 



Fig. 2. Pantolainhda caviyicius. .-!, superior miliars, No. 963 ; A', diagram of same ; C, 

 inferior molars, crown view, No. 3961 ; D. lower jaw, type of P. cavirictus. Am. Mus. Coll. 



These types are quite distinct from the trituberculates 

 described by Marsh^ from the Laramie, namely, Didelphops, 

 Cimolestes, Pedotnys., Telacodon, Batodon, so far as these are known. 



These animals are defined and placed here hypothetically 

 merely to show that /// the Upper Cretaceous are found types of 

 upper and lower teeth capable of giving origin to the teeth of the 

 Amblypoda. 



1 Having a type of tooth antecedent to that oi Pantolambda. 



2 Dedicated to Mr. J. B. Hatcher, the well-known writer and explorer. 



^ Discovery of Cretaceous Mammalia, Pts. I, II, III, Am. Jour. Sci., July, 18 



to Mch., 1892. 



