210 



G. B. COGHILL 







/••:.:/ 4s?,:^3 







Fig. 1 From an embryo of non-motile stage, level of sixth myotome^ F xa- 

 tionfn corrosive acetic mixture; stained with Boemer's hematoxylin and a«du 

 fated orange G; transverse plane; 10 m- Figures 1 to 27 are all magnified 4.0 diam 



^ Tie -^ From the same specimen, level of sixth myotome. 



Fig. 3 Same specimen, level between eighth and ninth myotomes. 



