ORDINAL TVl'KS OF MOLARS: T.KXJODO.XTA 



153 



In 18 90 Dr. J. L. Wortman 1 of the American Museum expedition 

 discovered that the animals long 1 described by Cope partly as Tseniodonta 

 and partly as Creodonta exhibited strong resemblances in the skeleton 

 to the Gravigrade Sloths, there being an especial similarity of structure 



PIG. 119. Lower jaw and teeth of Ony<-l,c,:/,<-l(* t;.< Hie.mi*, family Conoryctidje, order Tfenio- 

 donta, from the Puerco Formation, the most Creodont-like member of the order Ganodonta ; 

 showing lower molars of tuberculo-sectorial derivation, x . (From Wortman, after Scott and 

 Osborn.) 



FIG. 120. Skull and dentition of Ilfmli/niius ot<mhl< its, family Stylinodontidaj, order T;nio- 

 donta, from the Puerco Formation, Stage I , Basal Eocene, showing the enlarged gnawing 

 canines and other characters pointing toward Psittacotherium and Calamodon. xL (From 

 Wortman, after Scott and Osborn.) 



between Psittacothcrium and Megalonyx. This discovery was a direct 

 confirmation of the prophetic remark of Dr. Max Schlosser, 2 that 

 certain forms (Esfhonyx, Calamodon, Psittacothcrium), which, on the 

 one hand, are evidently (Onychodcctes and Hcniinmnis}, related to the 



1 " Psittacotheriuni, a member of a new and primitive sub-order of the Edentata," 

 Bui/. Amer. Mu. Xat. Hint., Vol. VIII., 1896, pp. 259--2G2. 



2 Quoted by Wortman from Schlosser's "Die Differenzierung des Siiugetier Gebisses," 

 Biolofj. Gentralblatt, June, 1890, p. "2~i'2. 



