394 



The mesocuneiform (cm) is also a compressed ossicle, of smaller size, wedged between 

 the entocuneiform, the proximal ends of the two small metatarsals (n, in) and the ccto- 

 cuneiform (ce). The back part of the proximal ends of in for an extent of five lines is 

 ligamentously and closely connected with the mesocuneiform; but the proximal articular 

 surface of in joins the fore part of the distal surface of the ectocunciform (ce). This (ce) 

 extends backward beyond the overlapping entocuneiform, and swells out into an 

 expanded ywAwZ-calcaneal process (ce'), which is closely united to a similar process of 

 the cuboid. A large plantar sesamoid (cut, Fig. 2), has a smooth surface (ib. a) 

 adapted to the surface h (fig. 1, PI. CXX.), below the grooved process (g), upon the 

 back of the fourth metatarsal. The above description is from a dissection of a full- 

 grown male M. major. 



The cuboides (PI. LXXV. figs. 1, si, & 2, cb, and figs. 10, 11, 12) equals the 

 astragalus in the longest diameter, and exceeds it in thickness and massiveness. It is 

 moderately smooth and flat from behind forward, on its upper (rotular) part, but is 

 convex across. At the hind proximal part the surface (fig. l\,f), concave in both direc- 

 tions but chiefly vertically, is more produced proximally than is the less-concave surface 

 (ib. e) ; these positions correspond to the different levels of the distal calcaneal surfaces 

 (ib. figs. 6, 7, 8, e,f) to which they are adapted. The surface e (fig. 11) is produced 

 downward and inward (at g) coextensively with the surface g of the calcaneum (fig. 8). 

 On the inner tibial side of the bone a narrow strip (fig. 11, h) is extended from the 

 surface f to articulate with the naviculare. The lower (plantar) part of the cuboid 

 (fig. 12) is developed into three prominences: the inner one (?'), in the form of an oval 

 tuberosity, articulates with the neck of the similar tuberosity (t) of the ectocuneiform 

 (tig. 9); the middle tuberosity (fig. 12, k) is coextensive with the length of the cuboid, but 

 is deeply grooved at the outer and under part of its origin ; the outer prominence (I) 

 supports the flat articular surface for the fifth metatarsal. The main part of the ante- 

 rior surface of the cuboid is articulated, but immovably, with the base of the great 

 (fourth) metatarsal (iv). The outer side of the cuboid (fig. 2, cb) extends downward 

 and backward beyond the metatarsal iv, so far as was required to offer an articular surface 

 (fig. 12, I) to the proximal end of the fifth metatarsal (fig. 14). 



Of the metatarsal series of foot-bones the first (or that of the hallux, i) is suppressed ; 

 the second (fig. 1, n) and third (ib. m) are filamentary, but almost as long as the fourth 

 (iv), which constitutes the chief part of this segment of the foot. 



The fourth metatarsal (ib. figs. 1 & 2, iv) has the upper or anterior surface (PI. CXVI. 

 fig. 4) convex across, and most so at the proximal half of the shaft, rising to a low ridge 

 near the joint with the tarsus. The lower or under surface is slightly concave trans- 

 versely at the distal two thirds (ib. fig. 5), prominent and rugged at the proximal third, 

 where toward the inner or tibial side it is developed into a low, thick, rough ridge 

 about an inch in length (ib. fig. 6, o). It presents a shallow channel with some rough 

 surfaces for the attachment of the proximal third of the fifth metatarsal on the outer 

 side. Above this attachment the fourth metatarsal sends backward a process (ib. fig. 6, e) 



