38 MAMMALIA. 



this name (Cat. Fos?. Mamm. Brit. Mus,, part iii., p. 54), and 

 similar teeth are ' to be found in nearly all collections of Red Crag 

 Mammals. 



Messrs. R. and A. Bell (Proc. Geol. Assoc., Vol. II., p. 212), 

 give this genus also from the Upper or Norwich Crag, but I am 

 unable to corroborate this ; and possibly limb bones which would 

 now be referred to Equus have been called Hipparion. 



It appears, therefore, that in Britain Hipparion gracile is only 

 known from the Red Crag Nodule-bed ; but the species has a 

 wide distribution, having been found in strata of Upper Miocene 

 or Lower Pliocene Age in France, Germany, Greece, Spain, 

 N.W. Persia, and Algeria, 



Genus RHINOCEROS, Linnaeus. 



The Rhinoceros teeth from the Red Crag which were known to 

 Sir R. Owen in 1856 (Quart. Journ. Geol. Soc., Vol. XII., 

 p. 217), he, with some hesitation, referred to R. Schleiermacheri, 

 and this name has been generally used for the species of Rhino- 

 ceros occurring in the Red Crag ; Prof. Lankester, however, 

 (Quart. Journ. Geol. Soc., Vol. XXVI., p. 510, 1870) alludes to 

 the possibility of R. etruscus and R. megarhinus also being Crag 

 species. More recently Mr. Lydekker (Quart. Journ. Geol. Soc., 

 Vol. XLIL, p. 366, 1886) has pointed out that the strong inner 

 cingulum present in the specimens figured by Sir R. Owen (loc. 

 cit., p. 231) and now in the British Museum (Cat. Foss. Mamm., 

 part iii., p. 149, 1886), makes these teeth agree better with 

 R. incisivus, Kaup, and this, I think, is more likely to be correct ; 

 but at the same time some of the upper premolars found in the 

 Red Crag are devoid of an inner cingulum, and these I take to 

 represent R. Schleiermacheri. 



Prof. Prestwich (Quart. Journ. Geol. Soc., Vol. XXVII., 

 p. 118, 1871) has recorded the finding of two Rhinoceros teeth 

 in the Nodule-bed below the Coralline Crag at Sutton, but the 

 species of these is uncertain. 



RHINOCEROS INCISIVUS, KAUP. 

 PLATE VI., FIGS. 1, , b, 2, 3. 



To this species are referred the Rhinoceros teeth from the 

 Red Crag Nodule-bed of Suffolk figured by Sir R. Owen (Quart. 

 Journ. Geol. Soc., Vol. XII., p. 231, 1856), and alluded to by 

 M.r. Lydekker (ibid., Vol. XLIL, p. 366, 1886, and Cat. Foss. 

 Mamm. Brit. Mus., Part iii., p. 149, 1886) as well as other 

 upper premolar teeth found in various collections, which have a 

 strongly developed inner cingulum. 



