of (he Hand in Pij)a and Xenopus. 



105 



:. 4 



lower position than that of the, fore side ; a ghmcc at fi 

 will make this plainer than any description could. 



The radial bone of the carpus is considerably smaller, 

 irreg-ularly wedge-shaped, on the fore side somewhat convex, 

 on the hind face concave, and has on the upper side an oval 

 articular facet for the inner (medial) part of the radius, and 



C.C, 



X 



Fig. .3. 



Fig. 4. 



CyC 



Left hand of Fipa. Fig. 1 seen from the dorsal sicte ; fig-. 2 from the 

 volar side ; tig. 3 from the radial, tig. 4 from the ulnar side. 



R, radius ; U, ulna ; r, radiale ; ?/+C5,the coalesced ulnare and car pale 5 ; 

 C+(^, the coalesced centrale and carpale 2 ; Cj, Cg, c^, carpalia 1, 3, 

 and 4 ; s, sesamoid bone ; II- V, metacarpaha II-V. In tig. 3 the 

 ligament between the sesamoid and metacarpale V is seen. 



projects in a free point behind the latter bone [cf. figs. 2 and 

 3) ; distally it is provided with a large facet, articulating 

 partly with the great ulnar bone, partly with the underlying- 

 carpal bone of the lower series, C + Cg ; when seen from in 

 front the radial carpal bone is nearly hidden by a rounded 

 little bone (s), resembling a small patella, which lies just 

 before the junction of the two proximal pieces and undoubt- 

 edly represents a sesamoid bone. 



In examining the distal series of the carpus from the dorsal 

 side only two pieces are seen, viz. a small oval carpal bone 



13* 



