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G. E. COGHTLL 







8 



Fig 7 From an embryo of the non-motile stage, between the eighteenth and 

 nineteenth myotomes. Fixation, Van Gehuchten's fluid (alcohol, chloroform, 

 acetic acid); stained with erythrosin and toluidin blue; horizontal plane, o m- 



Fig. 8. From an embryo of the non-motile stage, between the last two myo- 

 tomes cephalad of the unsegmented mesoderm; fixation and staining like the last; 

 transverse plane, 10 n. 



Fig. 9 Same specimen, from section adjacent to the last. 



