392 



ANATOMY OF VERTEBRATES. 



In the Cape Mole {Chrysocliloris) the clavicle is long: the 

 humerus is short and arcuate, with a single proximal articulation. 

 The radius and ulna coalesce. The carpus consists of a scaphoid, 

 usually confluent with a trapezoid, fig. 259, 5, ^; a lunare, of 

 small size, articulated to both radius, 54, and ulna, and present- 

 ing the opposite and larger surface to the magnum, m ; a still 



258 



259 



Bones of the fore-foot, Mole : magn. 



Bones of the fore-foot, Chrysochlons : magn. 



smaller cuneiforme ; and a pisiforme, p, in the form of a long 

 subcylindrical bone extending from the carpus to the humerus, 

 and simulating a third antibrachial bone. On the outer side of 

 the magnum, m, is a small unciforme supporting a rudiment of a 

 fourth metacarpal. The functional digits are but two : the pol- 

 lex is represented by a metacarpal and tAvo short phalanges, the 

 second being styliform, i : the index, 11, consists of a short meta- 

 carpal, a phalanx representing the first and second confluent, 1, 2, 

 and a larger ungual phalanx, 3, cleft at the end. The medius, 

 III, is of monstrous proportions : its metacarpal is broader than 

 long, to which articulates an enormous ungual phalanx, iii, bifur- 

 cate through the depth of the terminal cleft. A metacarpal re- 

 presentative of the fourth digit, iv, is firmly articulated with, and 

 strengthens the base of, the third digit. 



The volant Insectivora are as remarkable for the leno-th and 

 slenderness of the arm- and finger-bones, as the fossorial species 

 for the opposite proportions. The Common Bat ( Vesjjertilio 

 murinus) has long and strong bent clavicles : broad scapulae : 

 elongated humeri : still more elongated and slender radius and 

 metacarpals and phalanges of the four fingers, which are without 



