204 EOCENE FAUN^. 



The following points may be derived from parts of a skeleton of E. 

 hurmeisteri. The i)rocessus dentatus of the axis is short and obtuse, and 

 has an oval section. The doi-sal vertebrae are much smaller than the cer- 

 vicals, and the tubercular articulation is on a long diapophysis. The cau- 

 dals are very large. The scapula has a prominent coracoid hook. The 

 manus has five digits. The scaphoid is larger than the cuneiform, and is 

 di.stinct from the lunar. The trapezium is large and distinct; unciform 

 large. The phalanges are like those of Creodonta. The ilium has a narrow 

 plate with strong external ridge, which makes the section of its peduncle an 

 equilateral triangle. There is a large anterior inferior spine. 



The distinctness of the scaphoid and lunar bones and the five digits 

 of the manus show that this genus cannot be referred to the family of the 

 JErinaceidce, but to belong rather near to Solenod&n, and perhaps within the 

 boundarie.s of the Centetklce. 



The specimens show that my original determinations of the incisors 

 based oh loose teeth were correct. They also show that this genus is not 

 far removed from the Creodonta. 







There are several species of the genus, wliich I define as follows: 



I. Fourtli inferior premolar like first true molar. 



Larj;;er; third .superior piemolai* larger; fourth i)remolar with the external cuspbilob- 

 ate E. acutidens. 



Jledium; third sni)erior i)remi)lar .smaller; fourth premolar with external cusp .simple; 

 .sui)erior incisors wide; large inferior narrower E. burmeisteri. 



Medium; superior iiK.-isors narrow; large inferior wider U. bisulcatus. 



II. Fourth inferior premolar with anterior V open and cutting. 



Smallest; incisors unknown E. acer. 



A species of the size of E. acer has been named E. S2)atidariKS, but I 

 cannot place it in the above key, as the premolar and incisor teeth are un- 

 known. The section II approximates nearer the genus Conorydes than sec- 

 tion I. 



ESTHONYX BURMEISTKRI Cope. 



Report Vertebrate Fos3., New Mexico, 1874, p. 7: Report U. S. G. G. Surv. W. of lOOtli Mer., G. M. 



Wheeler, iv, ii, p. 156, pi. xi, fig. 26. 



Plate XXIV6, figs. 1-10. 



A fractured cranium exhibits the entire dentition ot this species, and 

 gives the characters satisfactorily. The anterior premolars are wanting. 



