EIIINOCEROS LEPTORHINUS. 389 



The zygomatic arches are crushed in on the right side and wanting 

 on the left ; the extreme height of the arch behind on the right side is 

 about 2- inches. The characters of the temporal fossse are not shown, 

 in consequence of the state of the zygomatic arches. The form of 

 the articular or glenoid surface for the lower jaw is also concealed 

 by matrix. The intermaxillary portion does not appear to have been 

 complete even in Cortesi's time ; it has now been considerably further 

 damaged by a fracture, and the missing piece has not been found. The 

 diastemal edges, as already described, are prominent and well marked, 

 bounding a gutter which contracts forwards ; they are now very much 

 in the state represented by De Christol's fig. 12 of the Montpellier form. 

 The orbits are placed immediately over the sixth tooth or penultimate 

 true molar. The position of the suborbitary foramen has already been 

 described. The auditory foramen is well seen on the left side, but 

 filled up with matrix ; it resembles very closely that seen in fig. 12 of 

 De Christol, running upwards in a gutter on the side of the occipital 

 crest. In fact, the lateral and posterior part of the parietals and the 

 lateral outline of the occipital crest towards the base on the left side 

 very closely resemble the same parts in De Christol's figure, with this 

 allowance, that in the latter the occipital condyles are wanting, while 

 in Cortesi's they project boldly backwards. The terminal outline of 

 the molar teeth of the left side resembles very closely, in a general way, 

 that of Gervais' fig. 1 of PI. II. torn. ii. of the ' Montpellier Transac- 

 tions.' The height from the edge of the penultimate molar, left side, to 

 the frontal plateau, which is crushed, amounts to about 11-^ inches. On 

 the right side the same measurement gives 9"7 inches. Unfortunately 

 the orbital rim is not perfect on either side ; it is best seen on the right, 

 but the suborbital tuberosity is wanting. 



Upper View. — "When the skull is seen from above it presents the 

 same elongated slender character as when seen in profile. This is 

 somewhat exaggerated by the skull having been crushed laterally, and by 

 the intrusion of the right zygomatic. In consequence of the immature 

 age of the animal, there is no indication of the sincipital lateral ridges 

 which define the temporal fossas, so strongly seen in Gervais' fig. 2 of the 

 Plate above referred to, and also in De Christol's fig. 13. Gervais' figure 

 looks much wider in consequence of the presence of the zygomatic 

 arches. De Christol's fig. 13 shows the nasals more massive proportion- 

 ally than in Cortesi's fossil. In both of these the frontal plane is ele- 

 vated between the orbits to sustain the second horn. This part of the 

 skull is cracked, fissured, and depressed in Cortesi's fossil, and the 

 angles of the trapezium over the orbits are broken on both sides. 

 Making allowance for this depression, the profile outline of the Cortesi 

 skull resembles more Gervais' figure than De Christol's, as regards the 

 line of contour of the nasals and frontals. The crush is so considerable 

 that on the right side the height from the upper rim of the orbit to the 

 frontal plateau is only 2 - 4 inches. The sincipital contraction of the 

 cerebral portion between the temporal fossa? is very much as in De 

 Christol's figure ; but the absence of bounding ridges on either side 

 leaves no indication of a defined tablette. 



Since the preceding remarks were written, I have been further able 

 to restore the posterior missing portion of the left zygomatic arch and 

 the greater part of the left articular condyle of the lower jaw. 



On the whole, the Cortesi cranium is in a wonderful state of preser- 



