472 



The explanation of the difficulty is to be found in the semimembra- 

 nous quadratus femoris, which acts as a " tie-hecm" to the arch, and, 

 without much expenditure of force, supports the weight of the body 

 placed on the vertex of the straddling arch formed by the tail and hind 

 feet. I do not know of any other animal in which the insertion of the 

 quadratus femoris is placed so low down on the femur, nor of anj~ in 

 which, as in the Kangaroo, a special trochanter is provided for this 

 muscle. 



9. 3£. agitator caudce, ... a, 

 .... b, 



5-09 oz. 



. 2-20 ) 



. 1-91 . . 1-94 oz. 

 . 1-70 j 



This muscle takes its origin from the sides of the 1st, 2nd, and 3rd 

 caudal vertebrse, and joins the posterior portion of the gluteus maximus 

 in a long tendon, which is inserted into the side of the patella and lower 

 margin of the vastus externus. 



. . . 6-06 oz. 

 2-64 ) 



1-73 2-01 oz. 

 1-67 ) 



10. M. glutceus maximus posterior, . a, . . 



„ . b, . . 



n • c ? • • 



,, . c , . . 



takes origin from the sacral fascia and from fascia covering gl. medius, 

 is separable with difficulty from gl. max. anterior, and is inserted by 

 common tendon with the agitator eaudce. 



11. If. glut ''(dus maximus anterior, . a, 2'46 oz. 



. b, . . . 1-92 ) 

 „ . c, . . . 1*54 > 1-65 oz. 



. c', . . . 1-48 ) 



This muscle takes its origin from the anterior margin of the ilium, 

 behind the origin of sartorius, and from the lumbar fascia and that cover- 

 ing the gl. medius ; and is inserted into the fascia flowing over the great 

 trochanter that gives origin to the vastus externus. 



12. M. glutceus medius, ... a, 9 - 47 oz. 



;; : : : I : :ph • 



Origin from the posterior edge of the ilium, from the ischiadic notch 

 forward, and from the surface of that bone, marked in Pig. 26 {gl. med.) 



13. M. glutceus minimus, . . a, 0*62 oz. 



: : I: : £3 • • ™- 



This muscle takes its origin from the surface of the ilium, marked 

 Fig. 26 {gl. min.), and is inserted into the line below the head of the 

 great trochanter, by means of a flat tendon. 



