EHINOCEROTIDJ!. 101 



' Palseontologia Indica,' ser. 10, vol. ii. pp. 37-39 ; if this 

 reference be correct, the specimen indicates a much smaller 

 individual than those noticed above. The mandible agrees 

 with the cranium in the narrowness of the interval between 

 the two lines of teeth. The symphysis is broken, but 

 there are no traces of the alveoli of canines ; the form 

 of the symphysis and its relation to the premolars are 

 more like those obtaining in R. sirnus and R. bicornis than 

 in any other existing species. 



Cautley Collection. Presented, 1842. 



Rhinoceros leptorhinus (Owen 1 ). 



Syn. (?) Atelodus aymardi, Pomel 2 (teste Boyd-Dawkins). 

 Rhinoceros hemitachus, Falconer 3 . 



Rhinoceros mesotropus, Aymard 4 (in parte) (teste Falconer). 

 (?) Rhinoceros lunelensis, Gervais 5 . 



Cuvier's name of R. leptorhinus being inadmissible for the next 

 species, and R. (A.) aymardi and R. mesotropus being uncertain, 

 while R. hemitcechus is of later date, Owen's name is adopted for 

 the present species 6 . 



The occiput is narrowest superiorly, and extends but little back- 

 wards : the narial septum, at least in some instances, is fully ossified. 

 In the upper true molars there is a buttress but generally no " comb- 

 ing plate," so that there are usually but two fossettes on the worn 

 crowns ; sometimes, however, a " combing-plate " is present, and there 

 are then three fossettes ; in the upper premolars a " combing-plate " 

 is less unfrequent ; there is a concavity at the base of the outer surface 



1 British Fossil Mammals and Birds, p. 356 (1846). 



2 Catalogue Methodique, p. 80 (1853). 



3 Quart. Journ. Geol. Soc. vol. xvi. p. 488 (1860). 



4 In Pictet's ' Paleontologie,' 2nd ed. vol. i. p. 298 (1853). The R. velaunus, 

 Aymard, identified by Gervais (Zool. et Pal. Fra^aises, 2nd ed. p. 90) with 

 this form, is of Lower Miocene age, vide Filhol, Ann. Sci. Geol. vol. xii. art. 3, 

 p. 75. 



5 Zool. et Pal. Fran9aises, 1st ed. vol. i. p. 48 (1848-52). In the second 

 edition Gervais identified this form with R. tichorhinus. 



6 Owen (British Fossil Mammals and Birds, p. 356) identified Jager's R. 

 kirchbergensis and R. mercki with his R. leptorhinus ; and Falconer in one part 

 of his memoir on R. hemitcechus (Palaeoniological Memoirs, vol. ii. p. 321) had 

 some doubts whether this might not be partially correct : in other passages, 

 however (he. cit. pp. 309, 398), he identifies the German form with R. mega- 

 rhinus ; the latter view is adopted by Boyd-Dawkins in the Quart. Journ. Geol, 

 Soc. vol. xxiii. p. 214 (1867). In the ' Palseontologia Indica,' ser. 10, vol. n. p. 6 

 the present writer followed Owen's identification, which is also followed by 

 Brandt. 



