1895.] 



ANATOMY OF PIPA AAIERICANA. 



839 



inner and under surface of the extremity of the femur ; the second 

 half has a more extensive insertion on to about the last half of 

 the femur. 



The adductor longus is perfectly distinct from the foregoing, 

 Its attachment is to the proximal part of the femur, and ends not 

 long after the commencement of the attachment of the adductor 

 magnus. 



The adductor hrevis has an attachment to the femur, which is 

 not so long as that of the last-described muscle. 



The semitendinoms has two distinct heads, which, however, lie 

 side by side, and are quite superficial in origin. They become 

 fused about two-thirds of the way between the origin and insertion ; 

 a little after this they dip under the recti interni, and are inserted 

 on to the fascia of the knee by a strong narrow tendon. 



The two recti interni are subequal in size. 



The rectus femoris group consists, as in the frog, of three 

 muscles ; but the middle muscle of the " triceps," the rectus 

 anticus femoris, differs entirely from that of Rana. It is a thin and 

 broad sheet of muscle, which arises entirely from the wide plate 

 of bone which is formed by the transverse process of the sacral 

 vertebra, and passes straight downwards parallel with the c/lutceus 

 to be inserted directly on to the proximal portion of the femur ; it 

 does not fuse with either of the vasti, which are both present and 

 normal. At its insertion (see fig. 5) it is in contact with the long 

 muscle already described as running to the lung. 



tFig. 5. 



oht. 



Some of the thigh-muscles oi Pipa. 



Ve., vastus externus ; ^^., gliitseus ; S.f., rectus femoris ; gnad., quadratus ; 

 Pso., psoas; c, biceps; lung mus., musculus pulmouum proprius ; Pyr., 

 pyriformis ; obt., obturator. 



The biceps is a slender muscle arising just below the vastus 

 externus ; it ends by a long thin tendon upon the bead of the tibia, 



