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 



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

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

 former is inserted on to the hyoid (Hy) ; do, cloaca; Cph, portion of the 

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

 depressores branchiarum ; Gh, geniohyoid ; La, linea alba ; Mh, J/A 1 , 

 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 ; Oh, second layer of 

 the same muscle ; Ph, claviculo-lmmeralis ; Spc, supracoracoideus ; Re, rectus 

 abdominis, passing into the visceral musculature (sternohyoid) at Re 1 , and 

 into the pectoralis major at P. 



