1895.] 



MUSCtTLAK ilf ATOMY OF XENOPUS. 



847 



narrow stout tendon from the symphysis pubis, and at its insertion 

 is wrapped round the insertion of the adductor magnus. 



The latter (the Adductor magnus) arises behind the Adductor 

 longus. 



The Adductor hrevis and joectineus form an inseparable fleshy 

 mass. 



The Sartorius (see fig. 4) is a very much larger muscle than it is in 

 the Common Frog; it is over half an inch in diameter at its widest 

 part. It arises not only from the symphysis of the innominate bones, 



Fig. 4. 



A. 



B. 



Under surface of scapula of Pipa : 1, 2, 3, transversi scapulares ; 4, 5, 6, 

 protraliens scapulae, levator anguli scapulae, and sternooleido-mastoid, 

 attaching scapula to head; 7, cuciiUaris; 8, interscapularis. 



Under surface of scapula of Xenopus: 1-3, transversi scapulares ; 4, rhom- 

 boideus ; 7, cucullaris ; 5 and 6 appear to correspond to those muscles 

 so lettered in Pipa or perhaps to 4 and 5. 



but from the cartilaginous pre-pubis, and from the septum between 

 itself and the abdominal muscles ; it thus appears to arise from 

 the anterior margin of the thigh for about one-third of its extent. 

 The posterior boundary is overlapped and covered for some depth 

 by the semitendinosus and recti inierni. The muscle may be said 

 to have two insertions : one is muscular upon the knee-joint in 

 contact with, but anterior to, the rectus internus ; the other is 

 upon the tendon and tendinous sheath which covers the end of 

 the semitendinosus. 



The Semitendinosus comes next to the sartorius ; as already 

 stated, it overlaps it and is itself overlapped, but not wholly 

 concealed, by the rectus internus. It is a long thin flat muscle 

 with a single muscular origin ; there is no trace of a double origin 

 as in the Frog, nor is there any connection with the Adductor 



54* 



