:,62 MR. J. C. GALTON ON DASYPUS SEXCINCTUS. 





Cuvier, in one of his figures, gives a good representation of the origin of the extensor 

 brevis', but the termination is ill-defined 1 . 



In M. tamandua, according to Rapp 2 , this muscle has attachments to all five 

 digits. Such a distribution is borne out by one of Cuvier' s figures of this species of 

 Anteater 3 . 



Extensor proprius hallucis. — Arises from the inner face of the fibula and from the 

 inner edge of its anterior spine or ridge, a little above the level of the point where this 

 1 >one begins to fuse inferiorly with the tibia, and below the lowest fibres of origin of the 

 tibialis anticus. The muscle runs obliquely inwards, parallel with the inferior or outer 

 edge of the tibialis anticus, and becomes tendinous at the level of the tibio -tarsal 

 articulation. 



The tendon, which runs parallel with that of the above muscle, courses along the 

 inner aspect of the tarsus, passes through a tendinous loop or pulley which projects 

 from the fibular side of the ossicle which lies immediately anterior to the prominent 

 scaphoidal tubercle, takes a direction inclining obliquely outwards, and, broadening out, 

 is inserted into the base of the proximal phalanx of the hallux. Just before this inser- 

 tion, it sends a communicating branch to that broadened-out portion of the tibial tendon 

 of the extensor communis which is inserted into the base of the proximal phalanx of the 

 second digit. The tendon then contracts again, and, runnii 

 hallux, terminates at the base of the ungual phalanx. 



Plantar muscles of hallux.— From the posterior edge of the smooth oval tubercle on 

 the fibular side of the plantar surface of the scaphoid bone arises a tendon which becomes 

 continuous with two fusiform muscular slips; one of which passes to the sesamoid 

 bone situated at the tibial side of the base of the proximal phalanx, while the other is 

 continued to the distal phalanx of the hallux. 



^ Though not strikingly homologous, these muscles may, I venture to think, be con- 

 sidered the representatives of the abductor and tibial head of the flexor brevis of the 



hallux. 



g along the dorsum of the 





They appear to be, with respect to function, opponents to the peroneus longus. 

 Plantar muscles of fifth digit— These are three in number, and are as follows : 

 a. A fusiform slip, which arises tendinous from the external, or fibular, tuberosity of 

 the calcaneal process, and from strong fascia connected with the outer edge of this bone, 

 and passes straight to its insertion into a strong tubercle developed upon the plantar 

 aspect of the metatarsal of the fifth digit. 



. A muscle, somewhat broad at origin, which arises immediately to the inner side of 

 the preceding, from the tibial, or inner, tuberosity of the calcaneal process. It gradually 

 narrows into a long slender tendon, which is inserted into the outer (fibular) side of the 

 ungual (middle ?) phalanx of the fifth digit, on its palmar aspect. 



These muscles are probably the representatives of the abductor and flexor brevis 



minimi digit i. 



r A very small and delicate muscle, which appears to take origin from the deep 



Op 



8 Op. cit. p. 51. 3 p. cit. pi. 261. fig. 1 



