32 



Edmund B. Wilson. 



Fig. VI. 



Sections of normal and lobeless Larvae. 



(Each of these is drawn from a single section, supplemented by a few details 

 from the two adjacent sections of the series. The deutoplasm is only shown in 

 the entoblast and mesoblast.) 



38, Slightly oblique cross-section of normal larva, 24 hours, just anterior to 

 the mouth ; 39, cross-section through the mouth ; 40, vertical section of lobeless 

 larva, 30 hours; 41, cross-section through prototroch-region of lobeless larva, 

 48 hours. 



