THE COMMON FROG, [chap. 



Doubtless, also, the very singular actions performed 

 by the male Pipa and Obstetricans are performed by 

 the help of the hinder extremities. 



At the same time that the Frog shows so startling 

 a resemblance in its leg muscles to the higher 

 animals, it shows as striking a difference from the 

 leg muscles of animals with which it is nearly 

 allied, — namely, with those of its class-fellows, the 

 Urodela. 



In Reptiles we meet with a muscle which takes 

 origin from beneath the joints of the tail, and is in- 





-m 



iwn-iii^-^^- 



F:g. 70.— Deeper Muscles of Extensor Surface of Right Leg of Menopoma. £, 

 biceps; EB, extensor brevis ; £//, extensor hallucis ; ELD, extensor longns 

 digitorum ; FC, fctnoro-caudal ; GMd and GAIi, muscles like the lesser glutei ; 

 C/l/jtr and AF, great extensors of the thigh ; /, vnuscle resembling the ihacus ; 

 //C, ilio-caudal ; IP, ilio-peroneal : SM and ST, muscles like the semi-mem- 

 branosus and semi-tendinosus respectively ; TA, tibialis anticus. 



serted with the thigh-bone, and which has no certain 

 representation amongst mammals, and is called 

 the fernoro-caiidal. 



