1856.] OWEN RED CRAG MAMMALS. 221 



characteristic of species. I have figured three of the best-marked 

 specimens. 



If the teeth in the lower jaw of the Rhinoceros Schleiermacheri 

 figm-ed by Kaup in tab. 11. fig. 8, op. cit., be compared with the 

 figures of the lower molar teeth of the Rhinoceros tichorhinus given 

 by Cuvier in pi. 6. fig. 7 and pi. 13. fig. 3, op. cit., and by Buckland 

 in pi. 21. fig. 5, op. cit., it will be seen that the tract of dentine 

 exposed by moderate abrasion in the hinder lobe of the tooth is more 

 angular in the miocene Rhinoceros, and more gradually bent in the 

 pleistocene one. 



If the figure of the lower molar of the Rhinoceros from the Red 

 Crag at Sutton, fig. 4, be compared with that of a probably answerable 

 molar, only a little more worn, of the Rhinoceros tichorhinus in the 

 * History of British Fossil Mammals,' fig. 127, p. 337, the same 

 dift'erence will be recognized, together with the difference in the 

 thickness of the enamel, the greater thickness of which characterizes 

 all the teeth of the Rhinoceros tichorhinus as contrasted with those of 

 the Rhinoceros megarhinus and Rhinoceros Schleiermacheri *, I have 

 no hesitation, therefore, in affirming that the crag-tooth, fig. 4, does 

 not belong to the Rhinoceros tichorhinus ; although, in the absence 

 of means of comparing it with the lower molars of the pliocene and 

 miocene Rhinoceroses hitherto defined, I cannot positively refer it to 

 any of those species. There is a short oblique, basal ridge at the 

 outer and anterior angle of the tooth, and a short rudimentary one 

 at the back part of the crown. 



Fig. 5 is a lower molar from the left side of the lower jaw of a 

 Rhinoceros, from the Red Crag at Felixstow ; it is more worn than 

 the preceding, but repeats all its characters of resemblance to the 

 lower molars of the Rh. Schleiermacheri, and of difference from those 

 of the Rh. tichorhinus. 



The crown of a right lower molar of a Rhinoco'os, from the Red 

 Crag at Sutton, fig. 6 a, b, c, of which the summit of the anterior 

 lobe had only just begun to be abraded, shows the anterior oblique 

 basal ridge continued, of less thickness, along the fore part of the 

 anterior lobe, where it describes a curve convex upwards, fig. 6 b ; 

 there is a shorter and thicker curved basal ridge, behind, fig. 6 c. 



The small lower molar from the right side of the jaw of a Rhi- 

 noceros, fig. 7, found in a crag-pit at Sutton, corresponds in size 

 and general form with the second molar of the Rhinoceros Schleier- 

 macheri figured in tab. 12. fig. 1 1, of Prof. Kaup's work above cited. 



The above-described specimens of fossil teeth of Rhinoceros, from 

 the crag-pits of Suffolk, afford satisfactory evidence of the remains of 

 a species distinct from the common Tichorhine Rhinoceros and 

 from the Leptorhine Rhinocei'os of the pleistocene era, and more 

 nearly allied to, if not identical with, either a species of Rhinoceros, 



* The figure of the lower molars of the Rhinoceros megarhinus, given by 

 Christol in the Annales des Sciences Nat. vol. iv. 2nd ser. pi. 2. fig. 1, and by 

 Gervais, in pi. 30. fig. 1. of the Paleontologie Fran^aise, as well as that of the 

 Rhinoceros pleuroceros, in pi. 8 of the Archives du Museum, torn, vii., are too 

 much reduced to be of use in this comparison. 



