THE HTXD-I.TMB. 



51 



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 

 ligament'iim catcanei, which 

 will be described below (see 

 Muscles of Foot, Fig. 88 /<), 

 may be regarded as an un- 

 attached process of the heel 1 . 

 /3. The distal row of the 

 tarsals are all composed 

 of calcified cartilage. Thev 

 are : 



1. Os culolhnm (Fig. 47 

 cb], a flat plate of cartilage, 

 concave in front, convex 

 behind, placed between the /'/ 

 common epiphysis of the 

 astragalus and calcaneum 

 (ac) and the ossa metatarsi II 

 and ///. This corresponds, 



as Duges suggests, with the 

 separated os culoifJeii.m and 

 cioifif unne III of other ba- 

 trachians, e.g. Bufo. 



2. On the inner side of 

 the above, between the as- 

 tragalus and i/tefatarw* /lies 

 a small bod}', concave in 

 front, convex behind, which 

 we may regard, with Dug.' - 

 as the analogue of the n* 

 narici'fii.re (Fig. 47 //}. 



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 "* 3cuboideum - 



1 Meckel, I.e., II, p. 488. regards the cartilage in the tendo Achillis as such. 



E 2 



Rightfoot of Ranaetculfnta, palmar snrface.twicenat. size. 

 t Astragalus. h First, h' second cartilage 



ac Common epiphysis. of supplemental toe. 



Calcaneum. n Ossa metacarpi. 



Os naviculare. 

 / to F First to fifth toe. 



