512 



of which there is no trace of the socket. The two incisors of the upper jaw and the corre- 

 sponding large outer incisors of the lower jaw are preserved : the post-tympanic process is 

 much less developed than in the Sumatran Rhinoceros. 



Hunterian. 



2970. The skull of a young Indian Rhinoceros (Rhinoceros indicus), wanting the 

 premaxillary bones and most of the molar teeth. 



In the upper jaw the first small grinders are preserved, and the germs of the second, third 

 and fourth premolars may be seen in their formative sockets : in the lower jaw the summits 

 of the large external incisors are beginning to protrude, and the germs of the second, third 

 and fourth premolars are exposed as in the upper jaw. The first true molar remains in the 

 left ramus. 



Hunterian. 



2971. The skull of the Indian Rhinoceros (Rhinoceros indicus). 



The permanent dentition is complete, save the first small premolar, which has been broken 

 away from the left side of the upper jaw, and no trace of either this tooth or its socket remains 

 in the lower jaw, in which the two small and middle incisors are preserved, with the two large 

 outer ones. 



Purchased. 



2972. The lower jaw of an Indian Rhinoceros (Rhinoceros indicus). 



It retains the small anterior grinders. The third deciduous molar, on the right side, has 

 been removed, to show the germ of the permanent molar. The last true molars are still in 

 their formative alveoli : the points of the great external incisors are beginning to protrude. 



Purchased. 



2973. The skull, wanting the premaxillaries, of a very young Indian Rhinoceros 

 (Rhinoceros indicus). 



The second and third deciduous molars are in place in both jaws, and the crown of the 

 fourth is just appearing above its formative socket. The germ of the small tooth in advance 

 of the second deciduous molar is at a similar stage of growth, which would seem to indicate 

 that it is the first of the permanent series : it has no successor. Traces of the sockets of the 

 rudimental deciduous incisors may be seen on the inner sides of the sockets of the large per- 

 manent incisors. The elements of the occipital bone are ununited. The post-tympanic pro- 

 cess, which takes the place of the mastoid, touches the postglenoid process by its extremity, 

 and circumscribes the meatus auditorius externus. The petrotympanic bones, being loose, 

 have been lost. The superoccipital developes the whole of the crest so called. There is no 

 distinct interparietal. The transverse frontonasal suture is parallel with the fore part of 

 the orbit. The base of the pterygoid process is perforated by the ectocarotid. The ento- 

 pterygoid, which swells into a tuberosity at its distal end, has been removed on the left side 

 to show the palatopterygoid suture, which it overlaps. The foramen ovale is bounded by the 



