of the Hand in Pipa and Xenopus, 



195 



lower position than tliat of the fore side ; a glance at fig. 4 

 will make this plainer than any description could. 



The radial bone of the carpus is considerably smaller, 

 irregularly 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 



Fiff. 1. 



Fig. 3. 



Fis. 4. 



Left hand of Pipa. Fig. 1 seen from the dorsal side ; fig. 2 from the 

 voLar side ; fig. 3 from thu radial, fig. 4 from the ulnar side. 



R, radius ; U, ulna; r, radiale ; ?/-l-c-, the coalesced ulnare and car pale 5 ; 

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

 and 4 ; s, sesamoid bone ; II- V, metacarpaUa II-V. In fig. 3 the 

 ligament between the sesamoid and metacarpale V is seen. 



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

 8) ; 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* 



