80 MR. A. SANDERS ON THE [Jan. 6, 



sented ; in L. belli the longus only occurred ; but neither were found 

 in P. japonicum. 



Flexor carpi ulnaris arises by two heads — one from the inner con- 

 dyle in conjunction with the extensor digitorum perforans, the other 

 from the proximal end of the ulna; this part is in intimate connexion 

 with the extensor carpi ulnaris ; the whole is inserted into the pisi- 

 form bone and into the flexor surface of the base of the metacarpal 

 bone of the fifth digit. 



Flexor carpi radialis (fig. 1, F.C.R.) arises from the inner 

 condyles, also in conjunction with the flexor perforans, and is inserted 

 into the radial side of the first digit, being closely attached to the 

 scaphoid in its passage across the carpus. 



Flexor perforatum digitorum arises, as usual, from a tendinous 

 band across the wrist ; it gives off a slip for each digit, the tendons 

 dividing for the passage of the perforans. 



Flexor perforans digitorum arises from the internal condyle and 

 from about two thirds of the proximal end of the ulna ; it forms a 

 broad tendinous expansion in the palm, which receives a muscular 

 slip from the ulnar side of the carpus, and then divides into five 

 tendons, one for each digit. 



The superficial muscle on the ventral aspect of the thigh does not 

 extend so forward a3 the one in L. belli or P. japonicum ; I there- 

 fore conclude that the first muscle in those species, viz. the sartorius, 

 is absent from P. coronatum, and that the muscle met with imme- 

 diately beneath the skin represents the more posterior and deeper 

 muscle, viz. the 



Gracilis (figs. 4 & 6, G.), which arises from a small portion of 

 the posterior end of the ischio-pubic ligament*, from the pubic 

 symphysis by means of a thin aponeurosis, and from the ventral 

 angle of the ischium ; it becomes more contracted in descending the 

 thigh, and is inserted by a narrow tendon on the inner surface of 

 the tibia not far distad of the knee-joint. 



Transversus perinei (fig. 4, Tr. P.) is well marked in this spe- 

 cimen ; it arises as in L. belli, from the cartilaginous rod which is 

 the contiuuationbackward of the ischio-pubic symphysis, and, form- 

 ing a broad plane of muscular fibre, is inserted into the ilio-ischiatic 

 ligament, or that ligament which extends from the ischium on the 

 ventral surface to the posterior point of the ilium dorsad. This 

 muscle is placed in front of the cloacal aperture ; it appears to cor- 

 respond to the transversus perinei in Iguana, but not to the muscle 

 described under the same name in Chamceleon. Behind it are several 

 small muscles devoted to the office of opening or closing this orifice ; 

 of these the 



Dilatator cloaca (fig. 4, D. C.) arises from the connective tissue 

 beneath the hypapophyses of the 5th and 6th caudal vertebrae ; and 

 passing forward in the central line, it divides into two branches, like 

 the letter y, which are inserted, one on each side of the cloacal aper- 

 ture, into the connective tissue of its posterior lip. 



* Which is the tendinous band extending from the hanmlar process of the 

 pubis to the ischium. 



