164 



COMPARATIVE ANATOMY 



Fio. 126. RIGHT CARPUS OF Emy* 

 europwa. From above. 



i, intermedium ; R, radius ; r.r, fused 

 radiale and centrale ; U, ulna ; n, 

 ulnare ; f and *, elements on the 

 radial and ulnar side respectively, 

 indications of additional radial and 

 ulnar (pisiform*! rays ; 1--5, the 

 carpalia, of which 4 and 5 are 

 fused ; 7 V, metacarpals. 



FIG. 127. LEFT CARPUS OF Lacerta 

 agilis. From above. 



c, centrale ; i, intermedium ; J?, 

 radius ; r, radiale, formed by the 

 fusion of two elements, one of 

 which corresponds to a prepollex ; 

 U, ulna ; ?t, ulnare ; t, pisiform ; 

 1 5, carpalia; 7 F, the meta- 

 carpals. 



form paddles : the radius and ulna were very short, and there were 

 numerous phalanges l (cf. Cetacea), additional rays being present 

 in the former genus. 



Amongst the snake-like kinds of Lizards, various degrees of 



/r 



(itftc. 



FIG. 128. RIGHT CARPUS OF A YOUNG 

 Alligator lucius. From above. 



C, centrale ; R, radius ; r, radiale ; 

 U, ulna ; n, ulnare ; t, pisiform ; 

 1 to 5, the five carpalia, as yet un- 

 ossified, of which 1 and 2, as well 

 as 3, 4, and 5, have become fused ; 

 7 V, metacarpals. 



FIG. 129. RIGHT TARSUS OF Emy* 

 europwa. From above. 



F, fibula ; (i\f.t.r, the fused inter- 

 medinm(!), fibulare, tibiale, and 

 centrale ; PA 1 , phalanx of 1st digit ; 

 T, tibia ; 14, distal tarsals ; 7 T, 

 metatarsals. 



reduction of the extremities occur, and in such forms as Anguis 

 and Amphisbsena they have practically disappeared entirely, as in 



1 An indication of this condition is seen in the embryo Crocodile. 



