220 PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 3, 



Mammals,' p. 141, wliich does away with the necessity of figuring' 

 that tooth. 



The characters of the Lexden upper molars are found also in all 

 those of the Rhinoceros of Kirkdale. In fig. 125 of the ' British 

 Fossil Mammals ' there is a tooth from this locality figured as the 

 deciduous upper molar of the tichorhine species. Examined, how- 

 ever, by the light of other specimens discovered since that great 

 work was written, the tooth in question, preserved in the British 

 Museum, presents characters found only in the leptorhine species. 

 The stoutness of the guard, the bevelling oif of the inner sur- 

 face of the anterior and middle colles, the absence of the ante- 

 rior combing -plate, and, consequently, of the accessory valley, 

 the large size of the posterior valley (a of Figure) differentiate it 

 from the tichorhine, and prove it to belong to the leptorhine Rhino- 

 ceros. A comparison of the tooth with the figures given by Pro- 

 fessor Brandt of the permanent teeth of B. tichorhinus, and with 

 those of the deciduous dentition that I have published in the ' N^a- 

 tural History Review,' proves conclusively that it is non-tichorhine 

 in character. It corresponds in every respect with a right upper 

 premolar (4) in the Oxford Museum from the same cavern. The 

 second right upper true molar, figured by Dr. Buckland in the ' Re- 

 liquiae Diluvianse ' (pi. 7. fig. 3), also presents characters essentially 

 leptorhine — namely, the excavation of the base of the external lamina, 

 the stoutness of the ascending guard, and the suppression of the 

 anterior combing -pi ate^ The tooth is very much worn ; and the guard 

 obliterated to such a degree that in the figure the section of it 

 visible on the crown- surface presents merely a deep fold at the inner 

 and anterior angle. The germ of a first premolar (Pm. 2), also from 

 Kirkdale, and in the Oxford Museum, presents the peculiarity of the 

 entrance of the anterior valley being completely blocked up, of the 

 median collis being represented by a thin bridge of enamel crossing 

 the crown-surface obliquely backwards from the inner to the outer 

 side and insulating the anterior from the posterior valley. The 

 latter, also, is larger than the former. All the remains of Rhinoce- 

 ros from the Kirkdale Hyaena-den that have passed through my 

 hands belong, without exception, to the leptorhine species of Professor 

 Owen. 



A right upper premolar (4), from the Crawley Rock Cave near 

 Swansea, in the Oxford Museum, presents the peculiarity of having 

 the posterior combing-plate (h, fig. 4) divided into two, as in the 

 corresponding tooth of the megarhine species from Herault, figured 

 by M. Gervais (Paleont. Fr. pi. 2. fig. 4). It is figured as illus- 

 trating all the salient points in the upper dentition of the species, 

 and not merely as a fine specimen of the last premolars. Upper 

 leptorhine molars have also been found in two other bone-caverns in 

 this country — in Gower, quoted by Dr. Falconer as belonging to B. 

 Tiemitoeclius, and in the cave on Durdham Down near Bristol, whence 

 they were obtained by Mr. Stutchbury and deposited in the Bristol 

 Museum. To the courtesy of Mr. William Sanders, F.R.S., I am 

 indebted for their examination. They consist of the upper teeth of 



