SEGMENTATION OF HEAD, 



319 



FIG. 229. Blastoderm of Scolopendra cingulata; A ventral aspect. B Longitudinal section 

 through a blastoderm at a somewhat later stage, on one side of the middle line. A Preoral 

 region, lateral region of the acron ; 1 pre-antenna ; 2 antenna ; 3 intercalated segment ; 4 

 mandible ; 5 first, and 6 second maxilla ; l'-6' the coelomic sacs corresponding to these 

 appendages ; 7-29 post-cephalic segments ; 30 mouth ; 31 anus ; 32 telson ; y yolk ; yn 

 yolk nuclei (after Heymons). 



