RHINOCEROS TICHORHINUS. 349 



plying the secreting 1 organ of the thick hoof which once 

 adhered to it : the under figure shows the smooth articular 

 surface which played upon that of the second phalangeal 

 bone. 



Of the bones of the hind extremity Dr. Buckland's 

 collection at Oxford contains a rich series, from which, 

 indeed, Cuvier derived much of his knowledge of the ana- 

 tomical distinctions of this part of the skeleton of the 

 Rhinoceros tichorhinus. He figures a fine specimen of 

 the os innominatum, or haunch-bone, (torn. cit. pi. xiv. figs. 

 1 and 2,) which, compared with that bone in the existing 

 one-horned and two-horned Rhinoceros, exhibits a narrower 

 and longer "foramen ovale:" the lateral borders of the 

 iliac bones are more oblique and more concave towards the 

 neck ; the anterior border is less convex, especially towards 

 the external angle ; and this angle is narrower, more 

 pointed, and not forked ; the external angle of the 

 tuberosity of the ischium is also more pointed. The 

 femur or thigh-bone of the Rhinoceros may be distin- 

 guished from that of the Hippopotamus, Aurochs, and 

 other large herbivorous quadrupeds of similar size, by a 

 flattened process extending outwards from near the middle 

 of the outer part of the shaft : this process is termed the 

 " third trochaiiter."' The shaft is broad and flat, especially 

 at the upper end. I have compared the proximal part of 

 the thigh-bone of the young Rhinoceros from Oreston, 

 in which the hemispherical articular head and the great 

 trochanter were in the state of detached epiphyses, with 

 the femur of a young Rhinoceros indicus in the same state, 

 and found the depression for the ligamentum teres 

 shallower in the fossil : the post trochanterian depression is 

 also shallower, and the third trochanter smaller. The shaft 

 is thicker in proportion to the lower condyloid expansion 



