MUSEUM OF COMPARATIVE ZOOLOGY, 



67 



the Cambridge specimen by only one; but this does not appear to be a constant 

 character. Tlie postero-internal cusp (metaconid) of the lower sectorial is 

 reduced to a rudiment, and the talon is much shortened antero-posteriorly. 

 Pm. 1 and 2 are relatively quite small, while pm. 3 and 4 are quite high and 

 massive. 



-<:Elurodon Wheelerianus, Cope. 



(Syn. Cams Wheelerianus, Cope, ^lurodon Wheelerianus, Cope.) 



This species is nearly as large as the preceding one, but differs from it (1) in 

 the much less strongly curved alveolar region, and (2) in the very large size of 

 the external upper incisor, which at the base is nearly as large as the canine. 

 Tlie species is represented in the collection by the facial region of a very old in- 

 dividual, the teeth of which are worn down to mere stumps. The face appears 

 to be proportionately longer than in ^. scevus, the orbit lying somewhat farther 

 back ; it is also very deep, and encloses an unusually large nasal chamber. 



^lurodon hysenoides, Cope. 



Figure 2. — Mandibles of ^/urorfora X J. A. ^. hyanoides; B. jE.Haydtni; 



C. -iE. SCBVUS. 



This, the smallest species of the genus, has been described by Cope from the 

 superior dentition : " The second and third premolars are robust and somewhat 

 swollen at the inner base. Each has a short heel, but no median posterior lobe. 

 The principal lobe is robust, in the third [prejmolar as wide as long at the base. 



