180 



COMPARATIVE ANATOMY 



either side of the body, each of the former consisting, in its simplest 

 condition, of dorsal and ventral portions, separated from one another 



\ 



FIG. 141. THE MUSCULATURE OF LARVAL AMBLYSTOMA (AXOLOTL). Ventral 



view. 



Add, adductor arcuum branchialium ; C, constrictor arcaum branchialium ; Cbb, 

 coracobrachialis brevis ; Ce, Ci, Ci l , external and internal ceratohyoid : the 

 former is inserted on to the hyoid (Hy] ; Clo, cloaca ; Cph, portion of the 

 constrictor of the pharynx, arising from the posterior branchial arch ; Dp, 

 depressores branchiarum ; Gh, geniohyoid ; La, linea alba ; Mil, Mh l , 

 anterior and posterior portions of the mylohyoid, which is cut through in 

 the middle line, and removed on the left side, so as to show the proper 

 visceral musculature ; 0, superficial layer of the external oblique, passing 

 into the fascia, which is shown cut through at F ; Ob, second layer of 

 the same muscle ; Ph, claviculo-humeralis ; <S;>c, supracoracoideus ; Re, rectus 

 abdominis, passing into the visceral musculature (sternohyoid) at Ee i , and 

 into the pectoralis major at P. 



