Mr. C. Forstcr (!oopcr on Mctaniyiiodon bugtiensis. CIO 



2, 3, and 4. From the extent to which they are worn, the 

 last jireniohir being rather more worn than the first molar, 

 and trom the fact tliat the last molar is only just appearing, 

 they might reasonably be considered as milk-teeth. Fortu- 

 nately, however, there are in the collection two other 

 specimens o£ the three anterior teeth absolutely similar in 

 size and shape, but one of them rather more and the other 

 rather less worn than those of the type-specimen. These 

 two specimens have been sectioned, and neither of them shows 

 the slightest indication of any replacing teeth. Specimens 

 of comparable age of other forms of rhinoceros from the same 

 deposits show that the fourth premolar comes into full wear 

 after the first three and at the same time as the third molar, 

 and from this point of view the series might be read as four 

 premolars and only two molars ; but, if this were the case, 

 the third molar should at least be ready to erupt, which shows 

 that the reading of the last tooth of the series as the third 

 molar is correct. It would appear further that, although the 

 fourth premolar comes into use later than the first molar, 

 and although for a period it shows less wear than the first 

 molar, the wear soon equalizes, and then even reverses. 

 This condition is clearly shown by a young adult specimen 

 in the University Museum of R. sumatrensis, where the third 

 molar is just touched by wear and the last premolar and first 

 molar equally worn. 



The specimen is broken away in front of the anterior teeth, 

 but there is enough of the alveolar border remaining on one 

 side to show that there was no tooth anterior to the series. 



The assumption, therefore, that the teeth represent three 

 premolars and three molars may be taken as being very 

 l)robable. If this is the case, then the shape of the last 

 molar prevents this form from being placed anywhere except 

 in the neighbourhood of the genus Amynodon. Tiie three 

 molars consist of a simple protoloph and metaloph with 

 strong protostyle and metastyle on the ectoloph, the meta- 

 style on the third molar being as strongly marked as on the 

 others. A small crochet is present on the metaloph of the 

 second and third molars, but only towards the top, and would 

 soon disappear in wear. This has happened on the first 

 molar, if one was present. Of the premolars, the third and 

 fourth are molariform. An internal cingulum is present and 

 complete on the first two premolars and on the protoloph of 

 the remaining teeth. 



The length of the six teeth is 280 mm., of which the 

 molar series takes 190 mm. The proportional lengths of the 

 premolars and molars is thus not much different to those 



40* 



