216 



G. E. COGHILL 



Fig. 23 From an embryo of the early-flexure stage, in the rostral portion of 

 the trunk. Fixation in corrosive sublimate-acetic acid mixture; stained m alum 

 carmine and Lyon's blue; horizontal plane; 10 m- , • u 



Fig. 24 From an embryo of the early-flexure stage, at the level of the eight- 

 eenth myotome. Same fixation and staining as figure 7 ; horizontal plane i 7 M- 



Fig. 25 From an embryo of the coil reaction stage, at the level between the 

 fourth and fifth myotomes. Fixation in corrosive sublimate-acetic acid mixture ; 

 stained in alum carmine and Lyon's blue; transverse plane; 10 m- 



Fig. 26 From the same specimen, at the level between the sixth and seventh 

 myotomes. 



