1872.] MR. A. SANDERS ON LIOLEPIS BELLI. 171 



origin ; it arises from the anterior border of the transversus perineei, 

 and by its posterior fibres from the ilio-ischiatic ligament. It is a fleshy 

 cylindrical muscle, and is inserted into the inner side of the head 

 of the tibia close to the internal lateral ligament ; it is also attached 

 to the inner edge of the interarticular cartilage of the knee-joint. 



Semimembranosus (figs. 8, 9, 10) is only covered by the sarto- 

 rius at its insertion ; it arises from the ilio-ischiatic ligament behind 

 the last and in conjunction with the semitendinosus ; it is broad at 

 its origin, and is inserted by a narrow flat tendon into the inner side 

 of the tibia within and even with the distal extremity of the internal 

 lateral ligament and the posterior border of the sartorius. 



Semitendinosus (figs. 10 & 11) arises, in conjunction with and 

 dorsad of the last, from the ilio-ischiatic ligament ; it forms the pos- 

 terior edge of the dorsal part of the thigh ; and its ventral surface 

 forms a sort of groove for the reception of the semimembranosus. It 

 swells out distad of its origin and then tapers off towards its distal 

 end ; it passes in front of the origin of the soleus, to which it is at- 

 tached by a strong tendon, and is inserted into the outer edge of the 

 tibia, between it and the fibula, close to the joint, and just beyond the 

 insertion of the pelvo-tibialis. 



Pectineus (figs. 9, 10, 13) is entirely covered by the sartorius; 

 arising from the ischio-pubic ligament and from the part of the 

 ischium adjacent, it is inserted into the middle third of the ventral 

 aspect of the femur. 



Pelvo-tibialis (figs. 10 & 14), in this Lizard, arises by two heads, 

 — one, outside the last, from the margin of the pubis by means of an 

 aponeurotic expansion, to which is also attached the iliacus externus 

 and flexor femoris (?) ; the other head arises from the ischium at the 

 inner edge of the origin of the pectineus, and is covered by the 

 transversus perinaei, by the lower margin of the sartorius, and by the 

 origin of the gracilis ; the two heads converge, and, uniting at the 

 distal point of the pectineus, are inserted into the outer margin of 

 the tibia, between it and the fibula, in close juxtaposition to the joint, 

 passing behind the tibia, but not through the joint, as is the case in 

 Gecko ; this insertion is just in front of that of the semitendinosus : 

 it has also an attachment to the interarticular cartilage of the knee- 

 joint. 



Rectus femoris (figs. 8, 9, 10, 11) has two origins, one from the 

 pubis immediately in front of the acetabulum, the other by means of 

 a uarrow tendon from the anterior end of the ilium ; it covers the 

 anterior and ventral surfaces of the femur, and is inserted, through 

 the ligamentum patellae, into the head of the tibia. 



Gluteus maximus (fig. 11) arises from the ilium by a broad ten- 

 dinous origin, posterior to and distinct from the last ; it covers the 

 outer side of the thigh, and merges into the vastus externus beneath, 

 and by its anterior border into the same. In Gecko it appears to be 

 part of the rectus ; but here- it has a distinct origin. 



Biceps femoris (figs. 11 & 12) is represented by the pelvic origin 

 only ; it arises from the posterior end of the ilium, and, passing down 

 the thigh, is inserted by a flat tendon into the outer side of the fibula 



