HIP. 81 



B. 164. Right hip-bone of a foetal Horse (Equus caballus) with 

 a portion of the head of the femur. The ligamentum teres 

 is separable into two well marked divisions. The one 

 (cotyloid) lies entirely within the joint-cavity ; tbe other 

 (pubio-feinoral) passes from the femur head through the 

 cotyloid notch and is attached to the pubis, pubic tendons 

 of the abdominal muscles, and tendon of origin of the 

 pectineus. Its close relation to the pectineus has led some 

 to regard the ligamentum teres as a divorced tendon of 

 that muscle. 



Sutton, Ligaments, etc., London, 1882, p. 38. 



B. 165. The left os innominatum and femur of a Seal (Phoca 

 vituUna). 



The capsule of the hip-joint is partly removed, and the 

 head of the thigh-bone turned out of the cotyloid cavity, 

 showing it to be quite smooth, without any depression for 

 a ligamentum teres, which is absent in this animal : the 

 cotyloid cavity has, however, the usual notch and depression, 

 the latter being filled with fatty membranous substance. 

 0. C. 255 B. 



B. 166. Bight os innominatum and femur of a young Walrus 

 ( Odobcenus [ Trichechus~\ rosmarus) . The femur is dislocated 

 and the capsule of the joint removed to show the absence 

 of the ligamentum teres. 0. C. 255 B a. 



B. 167. The left os innominatum and upper part of the femur, 

 with a section of the lumbar, sacral, and coccygeal verte- 

 brse, of an Orang-Outang (Simia salyrus), 



The hip-joint is laid open, and the head of the thigh-bone 

 dislocated and turned forwards, to show its smooth and 

 uniform spherical articular surface, having no depression 

 for a ligamentum teres, which is absent in this species. 

 0. 0. 255 i. 



B. 168. Right hip-joint of a young male Orang-Outang (Simla 

 satyruz). The ligamentum teres is absent, but a peculiar 

 mark on the head of the femur may indicate its presence 

 at a still earlier period. 



G 



