400 RHINOCEROS. 



rather pointed tubercle is appended to the posterior barrel. The second 

 valley is formed by the continence of the combing processes ; it is very 

 round and insidated, with vertical walls differing from all Colonel 

 Wood's Gower sj:>ecimens. The posterior valley is also insulated all 

 round, with rather vertical walls. The vertical furrows upon the outer 

 surface are well pronounced ; the enamel surface, especially at the ends, 

 is decidedly rugous ; there are three fangs. I have compared it with 

 the drawings of Colonel Wood's specimens of ft. hemitcechvs, and with 

 the small ' Long Hole' milk molar, from all of which it is decidedly 

 different. The smoothness and thinness of the enamel in the latter is 

 strongly pronounced. In the form of the fissure, in the roundness of 

 the small valley, and in the enamel surface, it closely agrees with the 

 still more worn milk molar of ft. tichorlrinus from ' Long Hole,' Gower, 

 and I infer it to be of ft. ticlwrhinus. 



10 D. resembles 10 A. very closely in all its characters, but is con- 

 siderably less worn, and it shows large fangs. The large transverse 

 valley forms an isolated fissure, with a high step blocking up its open- 

 ing as iu ft. tichorhinus, but there is no tubercle. The small middle 

 valley is a round ring with vertical walls, but not quite insulated on its 

 inner side, there being a narrow cleft between the combing processes. 

 The posterior fissure forms a deep and rather vertical pit, the edge of 

 which is intact behind. In the characters of enamel surface, and outer 

 vertical furrows, it agrees entirely with 10 A. The posterior fissure in 

 the ' Long Hole ' (Gower) specimen is much more gaping and triangular 

 in its marginal outline, and very much more depressed at its hind 

 border. I believe Mr. Dawkins' specimens to be of ft. tichorlimvs and 

 not of anjr form of ft. leptorlunus. The ft. megarhinus has far more 

 combing plates. 



III. — Memorandum of Fragment of Lower Jaw of Rhinoceros 



TICHORHINUS, WITH MlLK DENTITION, FROM WoOREY HOLE. 

 December 7, 1862. 



Mr. Dawkins' specimen is a fragment of the anterior portion of the 

 left side of the lower jaw, containing the first three milk molars in situ, 

 with about one inch of the diastemal and symphysial portions ; the last 

 milk molar (m.m. 4) is wanting. With this exception, the Wookey 

 specimen resembles in the very closest manner the Lawford specimen 

 figured by Owen in the ' Brit. Foss. Mam.', pp. 338 and 363, Cuts 128 

 and 137. The m.m. 1 is all but intact at the apex of the cusp. The 

 m.m. ° has the middle cusp and posterior crescent slightly abraded, 

 but the anterior edge is intact ; m.m. 3 has both crescents slightly 

 abraded. 



M.m. 1 in form is exactly like p. 1 of Cut 137, and m.m. 2 like 

 p. 2, both of natural size and seen from inner side, the latter showing 

 the double cusps of the middle more pronounced. 



The diastemal portion, which is shown entire for about - 6 of an inch, 

 is very rounded. The enamel is rugous and there is no cement. The 

 jaw is low and the inferior edge is rounded forwards, and very broad 

 and flat. There is not the least appearance of incisors or their pits. 

 There is one large mentary foramen, at about f of an inch in front of 

 the anterior (m.m. 1) tooth, at about the middle of the height of the jaw. 



