368 RHINOCEROS. 



There is also a magnificent head, very well preserved, of Rh. Etruscus, 

 with the series of molars (six) of the two sides present. The anterior 

 portion is entire, and also the bony wall of the nasal partition. The 

 two jaws are slightly broken, and likewise the orbit of the left side. 

 The occipital portion, as well as the condyle, is wanting. The age of the 

 dentition is that which best shows all the characters, the last true molar 

 being very little worn. The three premolars are much affected by 

 wear. The antepenultimate has three fossettes ; the echancrure of the 

 first anterior ridge is still apparent, as in the drawing of the Bologna 

 skull (PI. XXIX.). The penultimate is less worn and has two fossettes, 

 the middle one being divided into two parts; and the crochet is serrated, 

 as in the Bologna jaw. The last premolar of the left side is well worn, 

 and shows three very distinct fossettes, and the crochet is but little 

 denticulated. The first true molar is half worn, the crochet is simple 

 and at right angles, without a combing plate ; the median hollow is 

 quite open on the inner side. The penultimate true molar has nearly 

 the same form, but on the left side the crochet is confluent with the 

 anterior ridge, so as to isolate one part of the median hollow which is 

 situated behind, as in the tooth of Crozes ; but on the right side the 

 crochet is detached. The last molar is very little worn, with the crochet 

 free, and a plate projecting from the anterior ridge. In form and size 

 it perfectly resembles the cast that I have brought from the Museum 

 at Pisa (PI. XXV. fig. 5), and the molars (pre- and true-molars) have 

 a basal crown on the inner side. The length of the series of six molars 

 is nearly the same as that in the drawing of the Bologna skull (9'8 in.). 

 The osseous partition and the nasal bones exactly resemble the draw- 

 ings of the specimens in the Florence Museum, but it seems to both 

 M. Lartet and myself that the osseous partition is less complete. 



The jaw is embedded on the left side in tufaceous greenish grey 

 alluvium — the ' Alluv. inter-volcanique ' de M. Pichot. 



III. NOTES ON RHINOCEROS LEPTOEHINUS (Cuv. pro. parte), 

 R. MEGARHINUS (Christol). 



I. — Description of Remains of Rhinoceros Leptorhinus (R.*megar- 

 iiinus) in the Museum at Montpellier. 



\Uh November, 1858. 



Examined the original of the fine lower jaw of R. megarhinus figured 

 by Gervais, and also another lower jaw of the same species more per- 

 fect at the muzzle, but mutilated behind. The former is double, and on 

 the right side comprises the whole of the ramus from the tip of the 

 incisive margin on to the condyle and coronoid, the apex of the coro- 

 noid being alone wanting. On comparing it with Dinkel's drawings of 

 R. hemitwchus, observed the following points of difference (See PL 

 XXX.): — 



1. The lower edge of the horizontal ramus is nearly a straight line 

 from the angle on to the anterior edge of the first true molar. 



2. The low elevation and great thickness of the body of the ramus. 



3. The horizontal line (still slightly concave) of the plane of dentri- 

 tion (very concave in R. liemitcechus). 



