BD 
1870. | MYOLOGY OF CHAMAILEON PARSONII. 73 
It is inserted into the base of the fourth metacarpal. This muscle is 
overlapped by the extensores m. III., 1V. & V., and appears super- 
ficially (its fibres running in a contrary direction to those of the ex- 
tensores last named) between the insertions of the extensor carpi 
radialis longior and the extensor carpi radialis brevior. : 
Extensor m. VII. (fig. 11, #7). This is exceedingly small, and 
arises from the dorsal surface of the central carpal bone and passes to 
the fifth digit. 
Extensor m. VIII. (fig. 11, F*). This muscle springs from the 
extensor surface of the ulnar carpal bone and passes to the dorsum 
of the fifth metacarpal. 
Extensor m. IX. (figs. 1 & 11, #9). A rather larger muscle 
takes origin from the ulnar side of the projecting styloid process of 
the ulna, and is inserted into the dorsum of the fifth metacarpal, side 
by side with the extensor m. VIII. 
Beside these extensors of the metacarpal bones, there are five 
extensors of the phalanges, extensores phalangorum (fig. 9, B‘, B* 
& B*). Each of these passes from the dorsum of one of the meta- 
carpals to the ungual phalanx of the same digit. 
Interosset. Beside the small muscles which have been described 
as flexores breves and adductors, there are other small muscles, which 
may be termed interrosseous, and which pass from the palmar sur- 
face of the metacarpal bones to the sides of the digits. 
Il. Muscues or THE Petvic Lime. 
Gracilis (figs. 4, 18, 19, 23, & 24, G). By this name it is con- 
venient to still designate the muscle which I have already so named 
in the Iguana, Menopoma, and Menobronchus. Nevertheless Pro- 
fessor Rolleston is very possibly right in deeming it not to be the 
homologue of the human gracilis; yet I cannot but remark its great 
resemblance to the muscle I have called gracilis of the Echidna, 
though freely admitting that I may have been wrong in so calling 
the muscle in question in that Monotreme. Whatever should be its 
true designation, it is very large and stout in Parson’s Chameleon. 
It arises from the whole pubo-ischiatic symphysis, and is inserted 
into the tibial side of the the tibia, just below and within the inter- 
nal lateral ligament. 
The ¢ibial adductor (figs. 4, 18, 19, 21, 23, & 24, S) arises by a 
rather strong tendon from the brim of the pelvis, just internal to the 
iliacus and a little distance from the anterior end of the pubic sym- 
physis. Continuing distad, it bifurcates just above the semitendi- 
nosus. The smaller part goes (in common with, but above, the 
semitendinosus) into the tibial aspect of the interarticular cartilage. 
The larger part goes (in common with the tendon of the semimem- 
branosus) into the antero-peroneal aspect of the head of the tibia, 
passing, from behind forwards, between the tibia and fibula. 
Semimembranosus (figs. 17, 23, & 24, S.M). A muscle (which 
seems to answer to the second part of the muscle I have called semi- 
membranosus in the Iguana) arises from the postero-inferior aspect 
