560 MR. J. C. GALTON ON DASYPUS SEXCINCTUS. 



substance, there is present another tendon, which leaves the body of the muscle at about 

 the level of the malleolus, and, lying first between the tendons of the p. longus and 

 brevis, and then to the inner side of the former, but sharing the same synovial sheath, 

 passes, superficial to, and to the inner side of these two tendons, under the fibrous bridge 

 mentioned above, to be inserted into the outer side of the base of the proximal phalanx 

 of the fifth dimt. 



This latter tendon may be regarded as a fair representative of that of the peroneus 



tertius. 



Meckel notices the arrangement of the peronei in the Anteater and Ai 1 . They are 

 described as being only two in number, long and short. In the former animal the first 

 is described as feeble, while the second divides into two factors which pass respectively 

 to the metatarsal and first phalanx of the fifth digit— an arrangement resembling that 

 which I have just described as existing in Basypus. In the Ai, both p. longus and 

 p. brevis are double, the longest factor of the former muscle cominjr from the femur. 



o 



This muscle, moreover, is not continued into the sole, but stops short at the base of the 

 external metatarsal. The same anatomist further on describes, as present in the Ant- 

 eater, a small extensor proprius of the fifth digit— 4 ' der dritte Wadenbeinmuskel 

 which springs from the fibula, between the lonsr and short extensor communis, and tei 

 minates at the fourth tendon of the for 



A similar short extensor proprius, or " third peroneal," is described as existing in 

 Dasypus (species not given), which comes even from the external condyle of the femur. 

 The termination of this muscle is, unfortunately, not mentioned 2 . 



The editor of the second edition of Cuvier's < Lecons ' remarks 3 that in the Ai there is 

 nop. longus. Thejp. brevis is a long muscle which arises from the whole length of the 

 fibula, and above the tendon of origin of the extensor communis, which itself comes from 

 the condyle of the femur. The " middle " peroneus 



but from the infer 



part of the fibula, serves as the extensor of the two external digits. 



Extensor communis dig it orum.— Arises from nearly the whole length of the anterior 

 ridge of the fibula, and from the outer half of the arch by which this ridge communicates 

 with that on the front of the tibia, being in close relation at its origin with the anterior 



inmates 



shorter) head of origin of the peroneus longus. A little above the tibio-tarsal joint it 



in three roundish equal-sized tendons, which, after passin- under a kind of 

 annular ligament at the joint, are distributed as follows : 



The outer, or fibular, tendon divides, at the metatarsophalangeal articulation of the 

 fifth digit, into two branches ; the outer of which passes to the terminal phalanx of this 

 digit, while the inner joins the lateral expansion of the tendon next to be described, 

 which this forms over the proximal phalanx of the fourth digit. 



The middle tendon, a little before its division, receives, on its inferior surface and 

 fibular side, the outer of the three divisions of the extensor brevis, and at the level of the 

 tarsometatarsal joint of the fourth digit divides into two branches, the outer of which 

 passes to the distal phalanx of the fourth digit, receiving at its lateral expansion the 



' VerSleiCh ' Anat ** * P ' m ' * Op. cit. pp. 641, 642. 3 Zoc . cit p . 5 42. 



