992 MESSRS. B. C. A. WINDLE AIS^D F. G. PARSONS ON [Uec. 19, 



Family Oryoteropodid^, 



35. Orycteropus capensis . (Galton, VIII.) 



36. „ „ (Humphry, IX.) 



37. „ „ (Cuvier & Laurillard, XVII.) 



Ectogluteus (Gluteus ^naocimus) and Oaudo-femoralis (Agitator 

 caudce). — In the Bradypodidoe the ectogluteus rises by fascia from 

 the sacral and caudal spines ; according to some authors from the 

 crest of the ilium also. As its origin is fascial, there is clearly con- 

 siderable scope for diversity of opinion and description on this 

 point. 



The insertion is into the shaft of the femur from just below the 

 great trochanter to the middle or rather lower. No separate 

 caudo-femoralis has been desci'ibed in these animals, except in 

 Cuvier & Laurillard's specimen (6), in which it was very small. It 

 seems quite probable that, in the other specimens of which de- 

 scriptions exist, it is fused with the ectogluteus. This hypothesis 

 is supported to a certain extent by the fact that in our specimen 

 of Cholcepus (8) the muscle had a double insertion, the anterior 

 fibres passing to just below the great trochanter, thus obtaining 

 the normal insertion of the ectogluteus in mammals, whilst the 

 posterior fibres reached the middle and lower thirds of the femur. 

 Among the Myrmecophagidce the ectogluteus and caudo-femoralis 

 can usually be separated from one another, the former passing to 

 the upper part of the femur and to the fascia lata, the latter to the 

 lower part of the bone. This was certainly the case in Myrmeco- 

 phciga (11) and Tamandua (14, 16) and, to a less extent, in Cydo- 

 thurus (21), though most of the dissectors of this animal do not 

 seem to have recognized the caudo-femoralis as a sepai-ate muscle. 

 In the Dasypodidce and Manidce both the ectogluteus and caudo- 

 femoralis are present, though usually closely united. In Glilamy- 

 dophorus (28 a) the latter rose separately from the sphseroma end 

 of the lower sphseroma support. In the Orycteropodidce the ecto- 

 gluteus is inserted into just below the middle of the femur, and the 

 caudo-femoralis into the lower end (37). 



Tensor fascice femoris and ilio-tihialls (^artorius). — In the 

 Bmdypodidce the ilio-tibialis is a well-marked muscle rising from 

 the crest of the ilium and passing to the innsr side of the head of 

 the tibia. This applies to Bradypus (1, 4, o, 6) and Cholcepus 

 (8, 9). The muscular fibres rising external to this and in the same 

 plane, instead of going to the fascia lata, accompany the ectogluteus 

 to the outer surface of the shaft of the femur, but we ar-e of 

 opinion that they represent the tensor fasciae femoris. 



In the Myrmecop)Iiagidm the ilio-tibialis is distinct and has the 

 hum^-n attachments in Myrmecopliaga (11) and Cyclothurus (17,21). 

 In Tamandua (14) and Cyclothurus (20) it rises from the tendon 

 of the psoas magnus or parvus. The tensor fasciae femoris is in- 

 separable from the ectogluteus. In the Dasypodidw both muscles 

 are present, but whereas the ilio-tibialis is a delicate muscle in 

 Dasypus (22, 23, 24), it is thick and fleshy in Chlamydophorus 



