KHINOCEROS IIEM1TCEC1IUS. 



349 



APPENDIX TO MEMOIR ON RHINOCEROS HEMITCECIIUS. 



Extracts from Br. Falconers Note-books. 



I. — Note on Lower Jaw, Right Side, of Rhinoceros Hemitcechus, 

 ' from Bacon's Hole, in Swansea Museum. (See p. 340.) 



27th April, 1858. 



Compared the original of Spence Bate's drawing (Plate XXI. fig. 1) 

 with Mr. Gunn's specimen from the Norfolk coast. They are very dif- 

 ferent. Spence Bate's drawing is not in exact profile. In the original, 

 the collateral last premolars attain nearly the same height, and are worn 

 exactly as a single tooth, the outer one a little lower. They are not 

 milk and true premolars, but double premolars of the second set. The 

 contour is not well shown in the drawing, particularly of the anterior 

 end, the jaw not having been placed vertically, but sloped outwards, to 

 show the crowns. The enamel of the teeth is smooth. There are two 

 very large mentary foramina, the one under the front of antepenulti- 

 mate premolar, the other under the back of penultimate. The front 

 one round and very large. 



The most remarkable difference is in the contour line of the lower 

 jaw, wdiich is curved in the arc of a circle very much as in the African 

 two-horned rhinoceros ; whereas, Gunn's specimen (PI. XXII. fig. 1) 

 is nearly wedge-shaped, without any considerable curvature. It is 

 certainly not H. leptorhinus. Gunn's specimen is also thicker ; the 

 inner longitudinal channel more marked, and the posterior one also ; the 

 teeth are shorter and thicker in Gunn's (relatively). The antepenul- 

 timate true molar in Mr. Gunn's specimen is also very much thicker in 

 proportion to the length. 



Extreme length of fragment at base . 



Length of three last teeth 



Length of last worn crown 



Ditto near base 



Width of ditto behind 



Length of penultimate . 



Width of ditto, behind . 



Ditto, front, base of crown 



Length of antepenultimate 



Width of ditto behind 



Width of ditto in front . 



Height of jaw behind last tooth, inside] 



Ditto in front of antepenultimate 



Extreme thickness under last tooth . 



Length of space occupied by five last teeth 



II. — Note on Molars of Rhinoceros Hemitozchus, from Durdham 

 Down, in Bristol Museum. 



4th Ma,/, 1858. 



But the most interesting of all are a set of upper molar teeth of 

 Rhinoceros, identical with the Rhinoceros of Bacon Hole ! Of these, 

 four belong to the left side and fit in pairs, of which two are worn 



