THE HIND-LIMB. 



51 



Fîg. 47. 

 surrounded and enclosed at 



their anterior and posterior 

 extremities in a common epi- 

 physis of calcified cartilage, 

 which has the usual struc- 

 ture found elsewhere. The 

 VigameyiUim calcanei, which 

 will be described below (see 

 Muscles of Foot, Fig. 88 Ir), 

 may be regarded as an un- 

 attached process of the heel ^ . 



/3. The distal row of the 

 tarsals are all composed 

 of calcified cartilage. They 

 are : — 



I. Os cvhovlevm (Fig. 47 

 cU), a flat plate of cartilage, 

 concave in front, convex 

 behind, placed between the // 

 common epiphysis of the 

 astragalus and calcaneum 

 [ac) and the 08sa metatarsi II 

 and ///. This corresponds, 

 as Dugès suggests, with the 

 separated os cutjoidevm and 

 cmieifonne III of other ba- 

 trachians, e.g. Bufo. 



3. On the inner side of 

 the above, between the as- 

 tragalus and metatarsus I lies 

 a small body, concave in 

 front, convex behind, which 

 we may regard, with Dugès, 

 as the analogu^e of the os 

 naviculare (Fig. 47 71). 



3. This latter supports a 

 cartilage which forms a pro- 

 jection on the inner border, 

 covered with skin. This 

 consists of closely -united 

 pieces, a small round, basal 



^ Meckel, I.e., II, p. 488, regardis the cartilage in the tendo AcMIlis as such 



E 3 



Riglitfoot of Ratiaescidenta ,\>a.]ma.v surface,twicenat. size. 

 a Astragalus. h First, h' second cartilage 



ac Common epiphysis. of supplemental toe. 



c Calcaneum. m Ossa metacarpi. 



cb Os cuboideum. n Os naviculare. 



/ to F First to fifth toe. 



