EHINOCEEOS LEPTORHINUS. 387 



Obs. 6. — De Christol's drawing, fig. 11, although stated by him to 

 represent the left side, is in reality of the right. The ragged black 

 shaded wall A of his figure represents pretty fairly the existing condi- 

 tion of the left wall of the nasal cavity, inner side ; and although mis- 

 taken by him for a nasal septum, is exactly what Cornalia states it to 

 be in his note to Duvernoy. 1 The light shaded portion included within 

 dotted lines is not, as De Christol supposed, a fracture where a large 

 piece was wanting, but in reality it represents a layer of argillaceous 

 cement, which has been spread over the fossil from the orbit to the 

 incisive termination, either to strengthen the specimen or to disguise 

 fractures. A depression is leit in the cement, indicating the position of 

 the suborbitary foramen. It is exactly situated as in Cortesi's drawing, 

 but the clay envelope deprives me of the means of deciding whether 

 it really is the suborbitary hole or not. The fractured slab of the 

 frontal between the orbits, indicated in Christol's drawing by the letter 

 C is a mistake ; the whole plateau of the frontal at this point, although 

 cracked and broken into minute pieces, is entirely present. The angles 

 of the lozenge on either side are broken over the orbits, and the 

 drawing of the fracture on the right side has misled De Christol. On 

 removing the cement, I find that the suborbitary foramen is present 

 on the right side, and situated exactly over the line of junction be- 

 tween the third and fourth premolars ; its posterior rim being in a line 

 with the anterior third of the last premolar, and yielding the following 

 dimensions: — From anterior rim of orbit to posterior margin of subor- 

 bitary foramen, 4 - 2 inches ; from the same point, i.e. rim of orbit to 

 bottom of nasal echancrure, 4'8 inches ; from bottom of nasal echan- 

 crure to tips of the nasals, 8 - 4 inches ; apparent entire length of nasal 

 bones, measured along curve, from the naso-frontal suture to tips in 

 the middle, 12- inches. 



The uncouth representation in profile of the molar teeth in Cortesi's, 

 Cuvier's, and De Christol's figures is owing to the fact already stated, 

 that they are pressed inwards tipon the palate, more especially the two 

 last, and their most salient points therefore appear fore-shortened ; the 

 representation of the opposite side would be much more natural. The 

 orbit is immediately over the penultimate and last molars, its anterior 

 margin on both sides falling in the line between the antepenultimate 

 and penultimate true molars. The outline of the naso-maxillary sinus 

 is well pronounced, as in Cuvier's figure, and the present height, which 

 is partly concealed, is approximately 4"2 inches, taken about the middle. 

 Strictly speaking, the orbit is situated immediately over the penulti- 

 mate true molar. 



Continuation of Description of the Cranium. 



Most of the details in the anterior part of these remarks were taken 

 when the Cortesi cranium was lying with the palate upwards; it has 

 since been turned and mounted on a tripod stand, admitting the profile 

 and upper surface to be compared. 



Profile. — This bears, as stated by previous describers, a close general 

 resemblance to that of the Sumatra bicorned Rhinoceros. The skull 

 has been exposed to lateral pressure, which has crushed in the right 

 zygomatic arch and the maxillary wall of the face, in front of the right 



1 See antea, p. 314. — [Ed.] 

 c c 2 



