no 



THE COMMON FROG. 



[chap. 



Doubtless, also, the very singular "actions performed 

 by the male Pipa and Obstetidcans 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- 



G-.Ti'Tx JZr 





-G^.y^x. 



JBi^.D 



\\-W 



Fig. 70.— Deeper Muscles of Extensor Surface of Right Leg of Menopomi. B, 

 biceps • EB, extensor brevis ; EH, extensor hallucis ; ELD, extensor longus 

 digitoriim ; FC, femoro-caudal : GMd and GMi, musc'es like the lesser glutei ; 

 GMx and KF, great extensors of the thigh ; /, muscle resembling the iliacus ; 

 nC, ilio-caudal ; IP, ilio-peroneal ; SM and ST, muscles like the semi-mem- 

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



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

 representation amongst mammals, and is called 

 the femoro-caudal. 



