OSTEOLOGY. 95 



almost flat, witli its inner and larger half inclined slightly 

 inwards. At the postero- external angle is another facet 

 for mediuna, which is rounded, slightly concave, continuous 

 with a small facet on the outer margin at the posterior part 

 for OS cuboides. For parvum there are two small round 

 facets, continuous with each other at the antero-internal 

 angle, the outer being concave, almost continuous with the 

 anterior surface for medium, the inner convex looking 

 downwards and backwards. The rest of this surface is 

 extremely rough for attachment of interosseous liga- 

 ments ; in some places it is perforated by foramina. 

 The miteriov and internal margins of the bone are rough- 

 ened for attachment of ligaments, and the imsterior margin 

 presents two very irregular prominences separated by an 

 irregular groove, which is continuous with the roughened 

 groove upon the inferior surface. The posterior surface 

 for articulation with cuneiforme parvum encroaches upon 

 the inner prominence below. The outer prominence inclines 

 slightly outwards, and on its postero-external part presents 

 a concavo-convex surface, extending obliquely upwards and 

 backwards for union with os cuboides. In connection with 

 the external extremity of the anterior articulatory part of 

 the upper surface is a facet elongated from before back- 

 wards, also coming into connection with os cuboides. 

 Behind this is a groove extending upwards and backwards 

 to the break in the superior surface. The rest of the 

 surface is rough for attachment of interosseous ligaments. 

 CUNEIFORME MEDIUM is a flat bone, situated at the 

 lower, inclined to the inner, part of the hock. It may be 

 distinguished from cuneiforme magnum by a projection 

 from the centre of its posterior margin, which is inclined 

 slightly inwards. The u])jper surface is for the most part 

 articulatory, presenting two distinct facets for union with 

 magnum. The first is oblong with a notch in its posterior 

 margin. It presents an anterior and a posterior rounded 

 margin ; the surface slants from the former to. the latter ; 

 it is, therefore, concave. The posterior notch is separated 

 by a roughened perforated space from an ovoid facets 

 extending obliquely inwards on the superior surface of the 

 process. The under surface much resembles this, but the 

 articulatory facets are convex and less regular, and the 

 posterior facet is elongated from side to side, inclining out- 

 wards and backwards, also the intervening roughened 



