1836.] 



of the Dddupur collection. 



491 



of such small relief, that in the profile their places can only be 

 observed by paying attention to the jagged outline at the depression 

 of the frontajs. With the above exceptions the specimen is perfect. 



A glance at PI. XV. will be sufficient at once to determine the species 

 with which this fossil rhinoceros must be compared. The depression 

 of the frontals causing the deeply curved outline of the upper planes 

 of the head ; the slope of the occiput ; the septum and its nasal 

 arch — all separate this cranium from the existing and fossil bicorn 

 species. The existing unicorn species is that, therefore, to which 

 recourse must be had in order to establish a comparison. 



In the unicorn rhinoceros of Java the height to which the crest of the 

 occiput rises above the palatal plane, as also the thickness and promi- 

 nence of the nasal arch supporting the horn, are less than in the Indian 

 rhinoceros. A line drawn tangential to the crest of the occiput and 

 the highest point of the nasal bones will, in the unicorn species of 

 India, be more raised above the plane of the frontals than is the case 

 in the Javanese rhinoceros. In the foregoing respects the fossil asso- 

 ciates itself with the Indian, and differs from the Java species. The 

 comparison may, therefore, in general be confined to the former. 



With the view of bringing at once under the eye, the discordance 

 which occurs between the relative values of analogous dimensions, the 

 subjoined table is here inserted. The modulus chosen is the space 

 occupied by the seven molars, because on this measurement the 

 development of the bones of the head must, to a certain extent, be 

 dependent. The measurements given in Cuvier's Os. Fos. have 

 afforded the proportions of the existing species ; and the table of 

 dimensions which closes this paper has given the proportions of the 

 fossil. 



Measurement. 



Cuvier's 

 Ind.Rhin. 



100 



1'02 

 I'll 



0-45 

 0.83 

 1-02 

 0-47 



Fossil. 

 Ind.Rhin. 



TOO 



0-80 

 1*05 

 038 

 0-78 

 100 

 0'60 



Space occupied by the seven molars assumed equal to, 



Height of occiput from lowest edge of occipital foramen to 



summit of crest of occiput, 



Greatest breadth of occiput, 



Least thickness of cranium across temporals, 



Breadth across at post orbital apophysis of frontals, 



Distance from anterior of orbit to auditory foramen 



Breadth across the occipital condyles, 



Referring to the table of dimensions it will be observed, that the 

 height of the occiput is in the fossil less by met. 0.021 than the 

 corresponding measure of Cuvier's Indian rhinoceros ; but the greatest 

 breadth of the occiput is met. 0.036 in favor of the fossil : relatively 

 to the space occupied by the seven molars, these two measurements 

 attain a less development in the fossil than in the existing animal. 



