537 



3198. The right tibia of a Horse. Hunterian. 



3199. The patella of a Horse. Hunterian. 



3200. The right astragalus of a Horse. 



It is characterized by the depth and obliquity of the superior trochlea, and by the ex- 

 tensive and undivided anterior surface, which is almost entirely appropriated by the navi- 

 culare. 



Hunterian. 



3201. The right calcaneum of a Horse. Hunterian. 



3202. The right naviculare of a Horse. Hunterian. 



3203. The right ectocuneiforme of a Horse. 



This, which is the homotype of the magnum in the carpus, is equally remarkable for its 

 large size, since it supports that metatarsal, answering to the middle one in pentadactyle qua- 

 drupeds, which constitutes the chief part of the hind-foot in the Horse. 



Hunterian. 



3204. The right cuboides. Hunterian. 



3205. The metatarsal of the middle toe (' cannon-bone '), with the anchylosed rudi- 

 ments of the metatarsals of the second and fourth toes (' splint-bones ') of the 

 left hind-foot of a Horse. 



There has been much ossific inflammation where these bones have anchylosed : the ordi- 

 nary medullary canal of the cannon-bone has been thereby obliterated, and a sinus has been 

 formed which penetrates the outer side of the cannon-bone. 



Hunterian. 



3206. The bones of the right fore-foot of a Horse, with a double and malformed 

 hoof. 



The cannon-bone presents the usual form and disproportionate size, except that its distal 

 epiphysis remains distinct and does not articulate with the whole of the distal extremity of 

 the shaft. A small proportion of the inner surface of this extremity supports a second epi- 

 physis, with which the smaller of the two hoofed digits articulates. The middle and ungual 

 phalanges of the normal hoofed digit are distorted inwards. The splint-bones, or rudiments 

 of the second and fourth digits, extend along five-sixths of the cannon-bone. The outer and 

 larger of the two hoofed digits is shown, by its exclusive articulation with the trochlear epi- 



3z 



