82 



MR. A. SANDERS ON THE 



[Jan. 6, 



is inserted into the outer edge of the tibia between it and the fibula. 

 This muscle therefore resembles the corresponding one of L. belli in 

 having two heads and being inserted into the tibia, but differs in the 

 two heads being closer together, in the tendon passing through the 



Fig. 4. 



Tr.E, 



Superficial muscles on the ventral aspect of the posterior extremity. X 3. 



joint, and in joining the semimembranosus ; it differs from the same 

 muscle in P.japonicum by being double aud joining the semimembra- 

 nosus, but resembles it in passing through the joint. Mr. Mivart 

 has figured this muscle both in Iguana and Cka?nceleon under the 

 name of tibial adductor. 



Pyriformis (fig. 4, Py.) resembles the same muscle in L. belli and 

 P.japonicum in general appearance, but differs slightly in origin, inas- 

 much as it is not attached to the centre of the caudal vertebrae, but only 

 to the inner end of the under surface of the transverse processes of 

 the sixth to the first inclusive ; it passes as usual through the pulley 

 formed by the ilio-ischiatic ligament, and is inserted into the femur at 

 the posterior border of the pectineus. The tendon, which passes down 

 the thigh, is inserted into the interarticular cartilage of the knee-joint, 



