146 TJNGULATA. 



the lower true molars (the ridge being only observable in little- 

 worn teeth), and the short deep mandible. 

 Rah. India. 



All the specimens are from the Pliocene of the Siwalik Hills, and, 

 unless otherwise stated, belong to the Cautley Collection (Presented, 

 1842). 



15347. Part of the left maxilla, showing all the cheek-teeth except 

 pm. 1 in a much-worn condition. This specimen indicates 

 a very small animal, the length of the space occupied by 

 the three true molars being 0,104, and the length of the 

 crown of m. 3 0,042. The enamel is smooth. In G. si- 

 valensis, No. 48563, which has the teeth in nearly the 

 same condition of wear, the length of the space occupied 

 by the three true molars is 0,124. 



40562. The imperfect cranium of a young individual, in two pieces. 



(Fig.) Figured by Falconer and Cautley in the ' Fauna Antiqua 

 Sivalensis,' pi. lxxxvi. fig. 2. On the left side the specimen 

 shows mm. 3 (broken) and mm. 4 in a well-worn condition, 

 m. 1 in an early stage of wear, and m. 3 in alveolo. It 

 is not shown whether mm. 2 was present. The teeth 

 have a smooth enamel, and are very much smaller than 

 those of the young cranium of G. sivalensis, the length of 

 the base of the crown of mm. 4 being only 0,025. The 

 first true molar corresponds in size with that of No. 15347. 



16165. The greater part of the left ramus of the mandible, showing 

 (Fig.) the last four cheek-teeth in a well-worn condition. This 

 specimen is figured by Falconer and Cautley, op. cit. 

 pi. lxxxvii. fig. 5. The teeth are nearly in the same con- 

 dition of wear as those of G. sivalensis (No. 17558), and 

 therefore show the characteristic difference in the form of 

 the inner surface. The specimen indicates an animal con- 

 siderably smaller than G. sivalensis (No. 17558), but with a 

 much deeper jaw and a shorter interval between pm. 1 and 

 pm. 4, and with a perfectly smooth enamel to the molars. 

 The following dimensions show the difference between the 



two specimens : — _, . „ . , 



6. autiquus. 6. sivalensis. 



(No. 161G5.) (No. 17558.) 



Length of m~3 0,058 0,065 



Depth of jaw at nrS 0,076 0,066 



Jm74 0,053 0,044 



Interval between pmTl and pm. 4 0,058 0,084 



