THE COMMON FROG. 



105 



The muscular conformity between the highest and 

 lowest of typically-limbed vertebrates is strikingly 

 shown by the structure of the thigh and leg, the 



Fig. 67. — Muscles of Ventral Surface of Menobranch-us. On the right side, super- 

 ficial muscles ; on the left side, deeper muscles, the mylo-hyoidei, pectoraJis, and 

 external oblique being removed. Also superficial flexor muscles of right pectoral 

 limb of Menobranchus. B, biceps ; CB^ and CR', coraco-brachialis ; CHE, 

 cerato-hyoideus externus ; £0, external oblique ; FL, flexor longus ; GH, genio- 

 hyoid ; MH^ and MH^, mylo-hyoideus ; OH, omo-hyoid ; P, P^, and P^, pec- 

 toralis ; R, rectus; S, subclavius ; SH, stemo-hyoid ; SL, supinator longus; 

 T, triceps. 



