300 PROCEEDINGS OF THE ACADEMY OF [1892. 



than ill that geuus, and the supinator ridge less prominent ; the ent- 

 epicondyle is very large and is perforated. The distal end of the 

 radius is narrow and flattened, and the facets for the scaphoid and 

 lunar are separate!}' marked, a very unusual feature among creo- 

 donts. The ilium is strongly trihedral and very little expanded ; 

 the inferior surface is broad and the spine prominent. 

 One species: T. (3Iiocl(jeniis) fioveriamis Cope. Puerco. 



ANACODONi Cope. 



This genus was founded upon the inferior molars and referred to the 

 Condylarthra. Osborn", however, who has obtained more extensive 

 material, regards it as a creodont and member of the present family. 

 According to him, the molar formula is P^ M.f and the dentition 

 presents the following pecularities : " (1) The enlargement of the 

 second molar in both jaws, the smaller size of the first and third and 



the very marked reduction of the entire premolar series (2) 



The degenerate condition of the cusps of the molars and the forma- 

 tion of innumerable secondary tubercles or crenations. (3) The 

 probable presence of a wide diastema." ^ has trito- and deutero- 

 cones and the tetartocone is represented by a low ridge, distinct 

 from the cingulum, and thus has the constitution of a molar. The 

 upper molars are of a broad oval shape, with very low main cusps, 

 small hypocone and very much wrinkled and tuberculate surface. 

 P« and 4 are small and have only a low heel in addition to the proto- 

 conid. M* has an enlarged hypoconulid. 



One species: A . w'sidejis Cope : Wasatch. 



TRIISODONTID^, Fam. nov. 



Superior molars tritubercular with low, massive cusps, sometimes 

 having a well developed hypocone on ^2 ; trigonid of lower molars 

 much higher than talon, but not forming a shearing blade, para- 

 conid reduced ; premolars high and acute. 



TRIISODONi Cope. 



This genus has many suggestions of affinity wMth the Meso- 

 nychidce, from which it differs in the less reduced and simplified den- 

 tition. The upper teeth and the anterior lower premolars are not 

 known. The canine is large and of oval section, without cutting 

 edges. P* is small and p* very large, with very high, acute and 



1 Proc. Am. Phil. Soc, 1881, p. 181. 



2 Bull. Am. Mus. Nat. Hist., Vol. IV, pp. 115-118. 



