RHINOCEROS IIEMITCECHUS. 



345 



cranium has yet been observed, nor an upper jaw containing 

 many teeth. The most conclusive description of evidence to 

 determine the species is, therefore, still incomplete. The 

 best examples of these remains are to be seen in the col- 

 lection of the Rev. James Layton, lately acquired for the 

 British Museum, or that of Mr. R. Fitch of Norwich ; and in 

 the valuable collection of the Rev. John Gunn of Irstead. 



Figs. 1 and 2 of PI. XXII. represent a fragment com- 

 prising the greater part of the horizontal ramus of the left 

 side of the lower jaw, with the three true molars in situ, and 

 the empty alveoli of the three last premolars. The aggregate 

 length of the series of teeth is less in this specimen than in 

 either Rhin. megarhinus or Rhin. hemitoechus, and the pro- 

 portions between the teeth are different ; the relative length 

 of the antepenultimate, penultimate, and last true molars 

 being in Rhin. hemitoschus nearly as 1*7. 1*95, and 2*2, and 

 in the Happisburgh specimen 1-5, 1-85, and 1-8. It belongs 

 to the collection of the Rev. John Gunn at Irstead, and was 

 found in the true Forest-bed, with roots of trees, &c, in situ? 



Another specimen from the collection of the Rev. James 

 Layton, now in the Palseontological series of the British 

 Museum, Cat. No. 33,326, is a corresponding fragment of 

 the lower jaw left ramus, containing the last premolar, and 

 the antepenultimate and penultimate true molars, together 

 with the anterior fang of the last molar in situ. The 

 ramus is mutilated in front through the anterior portior 

 of the penultimate premolar, and behind through the last 

 true molar. It is a trifle smaller in size than the previous 

 specimen, and the teeth are a little more worn ; but the 

 form of the jaw and the relative proportions of the teeth 

 correspond closely with those of the latter (PI. XXII. fig. 3). 



There are two fragments of lower jaws in the British 

 Museum, presented by Mr. Pentland, from the Val d'Arno. 2 

 The one (No. 28,802 MSS. Palaeont, Cat.) shows the upper 

 or alveolar portion of the left ramus, containing the last 



1 Mr. Gunn has kindly forwarded to 

 mo this specimen, to be drawn by Mr. 

 Dinkel. Affixed to it, is a label in Dr. 

 Falconer's handwriting, ' R. /cptorhinus, 

 Cuv.' But as above stated (p. 314), Cuvier 

 included under his Rhin. leptorMnus the 

 Rhinoceros of the Val d'Arno, which 

 Dr. Falconer subsequently separated 

 and designated Rhin. Etruscus. The 

 Rhinoceros of Messrs. Gunn and Lay- 

 ton's collections was therefore Rhin. 

 Etruscus. See pp. 310 and 355. — [En.] 



2 Other specimens of the same species 

 in Mr. Pentland's collection are also 



described in Dr. Falconer's note-books, 

 viz. : No. 28,804, a last or penultimate 

 true molar ; No. 33,324, a last milk ? 

 molar, upper jaw, right side ; and No. 

 33.323, a last milk molar, upper jaw, 

 left side. A tibia of Rhinoceros which 

 accompanies these teeth is described as 

 ' much more slender and considerably 

 longer than that of the Claeton species.' 

 The teeth are stated to have been from 

 the Conglomerate Sunsiuo of the Val 

 d'Arno, and not from the SiMuite or 

 blue clay.— [En.] 



