THE MUSCULATURE OF THE TRUNK. 



317 



a far bettor nomenclature might be adoped for these 

 muscles, as, notwithstanding their various modes of origin 

 and insertion, they were, in this bird at least, evidently 

 arranged upon quite a definite plan. 



Of the two pair of levators one is devoted to the 

 skeleton and one to the rectrices, and these are directly 



FIG. 76. Under view of posterior portion of pelvis of a Raven, together with the 

 caudal vertebrae ; designed to show the position of the infracoccygis 

 and latcralis coccygis muscles. Life-size, and drawn by the author 

 from his dissections. 



antagonized by the pair each of which I have called an 

 infracoccygis. 



Now we still have remaining lateral muscles both 

 for the skeleton of the tail and the rectrices, while to 

 these are added depressors for the same parts, and 

 omitting the transversus perinei, the whole is com- 

 pleted by the femoro-caudals, which lead from the 

 pygostyle to a thigh-bone on either side. 



