620 MR, C, FORSTER cooper on MIOCENE 



well-marked cusps, a feature of all the Indian teeth, whereas of 

 the European forms here compared, one has three cusps and the 

 other a low ridge of eight or nine wrinkles. The valleys are 

 more open and the ridges lower. The accessoiy cusps in the 

 second valley are much lower. 



There remain for a brief notice several ends of lower teeth, 

 apparently third molars, which are of unusual form. They all 

 resemble the one figured (PI. TIL fig. 2) in the buckling up of 

 the last ridge and in the curious structure of the talonid, which 

 is formed of four cusps of diflerent sizes pressed together into a 

 conical hillock. The valley between the last ridge and the talonid 

 is widely open and without any accessory cusp. This condition 

 I have not been able to match at all closely, although some 

 specimens of B. longirostre approach it. The teeth are the 

 average size of B. angustidens. Whether they represent another 

 form or are within the range of variation of the latter species 

 cannot at present be told. 



DiNOTHERIUM. 



This genus was first described from India by Falconer *, who 

 named a specimen from Perim D. incUcum. Its specific characters, 

 according to him, lie in the shape of the jaw, there being no 

 difierence from D. giganteimi in the teeth except a greater thick- 

 ness of the enamel. 



A second form, smaller than the first, from Attock was men- 

 tioned, but not definitely named by him. This was subse- 

 quently called D . penta23otam%a; by Lydekker f. In the Catalogue 

 of Fossil Mammalia in the British Museum %, presumably his 

 final opinion on the subject, he included the two forms under the 

 name indicum, and stated that many of the differences previously 

 used by him had proved to be individual variations. 



Another " species," I), sindiense (Lydekker), is too fragmentary' 

 to afibrd any evidence of a specific character. 



More recently Pilgrim has mentioned this genus. In the 

 Records § of the Indian Geological Survey he names a form from 

 Baluchistan D. naricuon, there stating that ''it difiers very 

 markedly from the other known species," and giving certain 

 characters. In his Memoir ||, however, he withdreAv this name 

 and made the form a variety, gajense of D. pentapotamice, although 

 Lydekker had already shown cause for making the latter the 

 same as D. indicum. 



Presumably Pilgrim's reasons for making his form a variety 

 were those by which he was at first inclined to make it a species, 

 i.e. the fact of the ridges in the last lower molar not being parallel 



* ' Falconer's Memoirs,' vol. i. p. 408. 

 t Pal. Ind. ser. x. vol. i. pt. 2, p. 72, pi. ix. 

 J Pt. iv. p. 11, and footnote. 



§ Pilgrim, Rec. Geol. Surv. Ind. vol. xxxvii. p. 156 (not vol. xxxviii. as quoted hy 

 Pilgrim in liis Memoir). 

 II Pilgrim, Mem. Geol. Surv. Ind., n. s. vol. iv. no 2 (1912). 



