ELEMENTARY ANATOMY. 



[LESS. 



The semi-membranosus of man is small compared with that 

 of some other animals (e.g. of the Horse and Ruminants), where 

 it is enormous ; the rump-steak of the butcher not consisting, 

 as often supposed, and sometimes taught, of the gluteus maxi- 

 mus, but of the semi-tendinosus and semi-membranosus. 



Sometimes (as e.g. in the Kangaroo) this muscle is more 

 or less completely blended with the semi-tendinosus. On the 

 other hand it may, as in Hyrax, not only be enormous, but 

 also arise by two heads (one from the ischium, the other from 

 the caudal vertebras), and have an insertion into the condyle 

 of the femur as well as into the tibia. 



This muscle may, as in the Iguana, consist of two parts ; one 

 attached to the back of the leg, embracing the inner head of 

 the gastrocnemius some fibres passing beneath the internal 

 lateral ligament ; the other inserted, in common with the 

 sartorius, into the peroneal aspect of the tibia (Fig. 317). 



FIG. 314. DEEPER MUSCLES OF FLEXOR SURFACE OF RIGHT HIND LEG OF 



MENOPOMA. 



A, adductor ; B, biceps ; FC, femoro-caudal ; FD, flexor digitorum ; G, muscle 

 in position more or less like the gracilis- it is cut and reflected ; /, muscle like 

 an iliacus ; 1C, ischio-caudal ; IIC, ilio-caudal ; IP, ilio peroneal ; SM and 

 ST. muscles like the semi-membranosus and semi-tendinosus respectively ; 

 TA, tibialis anticus. 



It may, together with the preceding muscle, present what 

 appears to be an anomalous condition, as in the Tailed-Batra- 

 chians (e.g. Menopoind]^}\^.\Q. a muscle (Fig. 314, SM} takes 

 origin from beneath the caudal vertebrae and blends with a 



