312 DR. C. \V. ANDREWS ON A NEW SPECIES OF 



is broken but which seems to have had a cutting-edge. There is 

 a distinct cinguhim round the whole crown, but it is much more 

 strongly developed at the posterior end. The enamel, except 

 near the base of the crown, is smoother than in pnig, perhaps 

 partly through wear. The posterior root is considerably the 

 larger. 



The first molar (PI. I, fig. 2) is present in both specimens, though 

 in each case the summit of the main cusp is wanting ; it is much 

 smaller than pm^ with which it is in contact ; its antero-posterior 

 length is 44 mm. and its width (above the anterior root) 18'5 mm. 

 The crown formed a cutting-blade consisting of a large anterior 

 and a smaller posterior lobe, both inclined a little backwards. 

 On the outer face of the posterior lobe there is a well-marked 

 surface of wear produced by shearing against the upper tooth and 

 extending down to the cingulum. This latter is well marked 

 and is most prominent at the hinder border of the tooth. 

 Immediately above the cingidum on the antero-internal side of 

 the tooth the enamel is raised into a group of small rounded 

 tubercles, a line of which is continued up on the antero-internal 

 face of the main cusp towards its summit. The general surface 

 of the enamel is raised into faint irregular ridges, which, 

 increasing towards the unworn edges of the hind cusp, give them 

 the appearance of being finely crenulated. 



In specimen A m^ is only just emerging, while in B, though 

 more advanced, the tooth is not fully in place ; in both specimens 

 it is imperfectly preserved, but, so far as can be seen, was quite 

 similar to m^. In specimen A it can be seen that the posterior 

 edge of the main cusp is raised into a number of erenulations, 

 which pass on the sides into irregular ridges of enamel. 



M,, was not cut in either specimen, but in B it has been partly 

 exposed and its form seems to be like that of the other molars. 

 The molars and the last piemolar form a closed series. 



The collection also includes an isolated single-rooted tooth 

 (M 11087) with a conical crown, pi'obably one of the incisors of 

 this species (PI. I. fig. 3). The innei'face is somewhat flattened, 

 And is limited anteriorly by a well-defined ridge. The posterior 

 surface of the tooth has the enamel raised into numerous irregular 

 more or less vertical ridges of enamel, the outer one being the 

 best defined and running up to the summit of the crown. There 

 is a slightly developed cingvxlum, most marked on the inner and 

 posterior faces. 



Another specimen probably belonging to this species is an imper- 

 fect axis vertebra (M 11089), without the neural arch and lateral 

 processes (PI. I. fig. 4). The odontoid is a blunt prominence, oval 

 in section ; it has a longitudinal ridge on its upper surface and a 

 slight dimple-like depression on its anterior end. From the base 

 of the odontoid the lateral surfaces for the atlas slope strongly 

 backwards, widening as they go ; their upper edge is marked by 

 ii strong ridge, behind which the stout pedicle of the neural arch 

 arises, inclining to its fellow of the opposite side. The posterior 



