MAESCrPIALIA. 735 



oblique than in the C. foliatus, from the greater downward extension of the 

 external, or masseteric edge. The interior edge, on the contrary, ascends a 

 little from the anterior inferior border, inclosing the large internal ptery- 

 goid fossa. The inferior plane commences below the anterior part of the 

 first true molar. The symphysis is short, and was not probably strongly 

 united, as indicated by the few rugosities of its surface. The coronoid pro- 

 cess rises from a point opposite the posterior extremity of the first true 

 molar. 



The incisor is relatively large, and is more curved than that of a 

 kangaroo, having the general form of that of a rodent. The acumination 

 or bevel of the posterior face is less rapid than that of a rodent, and is 

 perfectly gradual. The enamel band covers the anteroexternal face as far 

 as exposed, which is to below the anterior part of the diastema, and is 

 gently convex in transverse section. It does not cover the entire external 

 face, as its width is equal, while the anteroposterior diameter of the tooth 

 increases below. The posterior face is convex, and is not much narrowed. 

 The internal face is slightly concave, and the enamel is recurved so as to 

 form a band on its anterior part, thus differing from most rodents. The 

 enamel surface is delicately obsoletely line-ridged. The length of the dias- 

 tema is equal to that of the combined Pm. iv and.M. i. The fourth pre- 

 molar is a simple tooth with a triangular transverse section, the obtuse apex 

 of the triangle looking forwards. This edge is continued downwards by 

 reason of the exposure of the anterior root, and is not acute. The first 

 true molar is an elongate oval, with six tubercles on each side. These are 

 so closely placed that their outlines are angular, and they are only sepa- 

 rated by fissures. No cingula. The second true molar is three-fifths the 

 length of the first, and is broadly rounded posteriorlyT It supports four 

 tubercles on the internal, and five on the external sides, and a raised edge 

 connecting the sides posteriorly. The tubercles are appressed as in the 

 first molar. 



Measurements. 



M. 



Length of ramus without incisor to a point above angle O.Ct94 



Length from ramus to last molar, inclusive OCO 



Length from ramus to fourth premolar 025 



