55A MR. J. C. GALTON ON DASYPUS SEXCINCTUS. 



6 



It pasres forwards, closely embracing for about the first half of its course the lar 

 subjacent adductor muscle, and joins the aponeurosis (common also to the sartorius 

 above and the semitendinosus below) which is inserted obliquely into the tibia, between 

 its anterior ridge and the strongly developed internal lateral ligament, and becomes, 

 moreover, continuous with the fascia covering the front aspect of the leg. 



The origin and insertion of this muscle is very clearly and truthfully represented by 

 Cuvier in one of his illustrations of the myology of Dasypus 1 . 



Semimembranosus. — A strong, uniformly broad, strap-shaped muscle, which arises 

 from the ischium, anterior to the tuberosity of the bone, immediately below the origins 

 of the adductor and the cms penis. It passes along the inner aspect of the thigh, to be 

 inserted, the lower half, obliquely into the tibia, immediately posterior to and covered 

 by, at its insertion, the internal lateral ligament, the upper half into the facet and part of 

 the ridge on the inner aspect of the internal condyle of the femur. 



The inferior edge of the muscle, near its termination, is, moreover, connected with a 

 strong aponeurosis, common also to the semitendinosus and gracilis. 



Semitendinosus. —A narrow strap-shaped muscle, arising from the tuberosity of the 

 ischium, in close company with, but immediately posterior to, the most posterior at 

 origin of the two divisions of the biceps, and passing across to the inner side of the leg. 

 liter a somewhat long course, it terminates a little above the inner malleolus in a strong 

 aponeurosis, common to the terminal portion of the gracilis and semimembranosus, and 

 which is attached to the strongly developed « shin-ridge " of the tibia. By its lower edge 

 the muscle is connected with strong fascia, continuous with the inner edge of the inner 

 division of the gastrocnemius, close to its insertion. 



Biceps.— This muscle arises from the posterior (superior) edge of the ischium, imme- 

 diately anterior to its tuberosity. It is made up of two factors, which are distinct from 

 each other throughout the whole of their course. 



The most anterior at origin arises, partly fleshy, partly distinctly tendinous, from the 

 ischium, and, after proceeding halfway on its course, sends off, nearly at a right angle, 

 from its upper or outer edge, a slender muscular slip, which is finally lost in the fascia 

 covering the outer aspect of the leg, not far below the lowest portion of the tensor 

 togma femoris. The main part of this factor of the biceps terminates in the strong 

 taseia m the neighbourhood of the heel, at a little distance above the calcaneal process. 



Ihe second division of the muscle arises slightly posterior, but superior, to the former 

 portion taking origin from the tuberosity itself of the ischium, and bein* intimately 

 connected with those fibres of the gluteus maccimus which have their u~^ ™ «- ^ 

 uariy m its course it crosses over and passes to the inner side of its fellow, on which 

 Wln/Tr 8 ' UP t0 ltS termination in st ™S fescia which is in close relation with the 



SntLl?!! T f diViSi0n ° f thG ^trocnemius, separating this muscle 

 pom f 10m the terminal part of the first-described factor of the biceps. 

 Cuvier represents, somewhat vaguely, this muscle as a broad triangular sheet 



at this spot 



thi 



of the outer aspect of the calf, and seemingly blending with its fascia 



1 Anat. Comp. pi. 260 



j 



Op. cit. pi. 259. fig. 2 



