THE EXTREMITIES OF ORYCTEROPl S CAPENSIS. 5S9 



Glutens minimus. — Arises from the outer surface of the ilium, covered by the upper two- 

 thirds of the pyr if or mis, aud is inserted above this muscle into the upper part of the groat 

 trochanter. 



Piriformis. — A large well-developed muscle, taking origin mostly from the outer face 

 of the ilium near its junction with the Bacrum, a few of its Lowermost fibres arising from 



the inner face of the latter bone. It is inserted by a broad strong tendon into the outer 



face of the external trochanter, below the termination of the gluteus m limus. For the 

 whole of its extent, both at origin and at insertion, it is covered by the gluten* medius. 



Perhaps this muscle ought to be regarded as a deepen- factor of the gluteus hist men- 

 tioned. A fair representation of it may be found in Cuvier plates 1 . 



Obturator extermts — -Is a large, fleshy, fan-shaped muscle, taking origin from the 

 anterior half of the circumference of the obturator foramen, and being inserted by a 

 strong tendon into the digital fossa of the femur. 



Obturator internus.— This muscle, which I have described as absent in Dasypus *ex- 



por 



'tus, is, for a great part of its extent, concealed within the pelvis; but its terminal 

 :ion may be seen emerging at the lesser sciatic notch, immediately below the 

 representation of the lesser sacro-sciatic ligament, at which point it passes oyer a smooth- 

 grooved facet and becomes tendinous, its tendon very soon fusing v, ith that of the gemrlli. 

 According to Cuvier 2 the obturator interna s arises solely from the inner aspect of tin 



posterior branch of the ischial tuberosity. 



Gemelli.-A.Ye very well developed, and occupy their usual position in relation lo tin 

 preceding muscle. They seem, however, each to have t wo heads of origin. The superior 

 gemellus rises, as usual, from the posterior edge of the ischium, immediately above its 

 " spine "—also, for a certain extent, from the inner face of the bone. It is, moreover, 

 reinforced by a flat muscular slip which takes origin from the posterior half of the sacral 

 edge of the large sacro-ischiatic foramen, and the tendon of which joins the first-d bribed 

 element of the muscle after this has become tendinous. The inferior gemellus take- 

 origin, in part, from the free edge of the ischium below the spine of the bone, but mostly, 

 as a large fleshy belly, from the posterior part of the tuberosity and from what may be 

 regarded as the greater sacro-sciatic ligament. 



The strong conjoined tendon of the gemelli is joined in the middle; by that of 



obtin 

 obtur 



mdthen terminates in the digital fossa, above the insertion of 



muscle 



Prof. Humphry does not appear to have found any sacral origin of thes* 

 the specimen which he has described 3 ; but Cuvier has left a short note, which M. Ad 

 Eocillon has incorporated in a description of his plates of the Orjjcteropus, and which v. 



"Les Jumeaux viennent du Sacrum; le Jumeau postern ur (inferieur) z 



follow 



des fibres de la tuberosite de l'lschion 



?> 



Quadratusfemoris.—-Mj specimen agreed with that of Prof. Humphry in not possessing 

 the above muscle. Cuvier, however, has in two of his figures 4 attached to a large muscle 



1 PI. 256. fig. 3, op. tit. 



■ See short note by this author, appended to the description of his plat<s of the anatomy of Orycteropus. 



3 Loc. cit. p. 312. 



* Op. cit. pi. 256. figs. 1 ft 3. 



