VII.] 



THE COMMON FROG. 



lO! 



The muscular conformity between the highest and 

 lowest of typically-limbed vertebrates is strikingly -^ 

 shown by the structure of the thigh and le^, the ' 



Grsn:. 



^-V- Ji^-xr:^;, 



mrjrLX. 



"^V ? —Muscles of Ventral Surface of Menobranchus. On the right side, super- 

 ficial muscles; on the left side, deeper muscles, the niylo-hyoidei, pectoralis, and 

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

 limb of Menobra7ichiis. B, biceps; CB^ and CB'^, coraco-brachialis • CHE 

 cerato-hyoideus externus ; EO, external oblique ; FE, flexor longus ; GH eenio- 

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

 toralis ; R, rectus; 6", subclavius; SH, sterno-hyoid ; SE, supinator lonsus'- 

 1 , triceps. ** ' 



