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Show 1870.] MYOLOGY OF C H A M A E L E O N PARSONII. 873 It is inserted into the base of the fourth metacarpal. This muscle overlapped by the extensores m. III., IV. & V., and appears superficially (its fibres running in a contrary direction to those of the extensores last named) between the insertions of the extensor carpi radialis longior and the extensor carpi radialis brevior. Extensor m. VII. (fig. 11, E1). 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, EH). 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, E9). 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, Bl, li2 & B'). Each of these passes from the dorsum of one of the metacarpals to the ungual phalanx of the same digit. Interossei. 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 surface of the metacarpal bones to the sides of the digits. II. MUSCLES OF THE PELVIC LIMB. Gracilis (figs. 4, 18, 19, 23, & 24, G). By this name it is convenient to still designate the muscle which I have already so named in the Iguana, Menopoma, and Menobronchus. Nevertheless Professor 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 internal lateral ligament. The tibial 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 symphysis. Continuing distad, it bifurcates just above the semitendinosus. 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 semimembranosus) 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 semimembranosus in the Iguana) arises from the postero-inferior aspect |
