242 



EARLY STAGES OF ARTHROPOD AND VERTEBRATE EMBRYOS. 



p.e. 



Kit 

 _ ivm. 



FIG. 149. Same, stage L, seen from the hasmal surface, showing the completion of the sixth thoracic and all 

 the abdominal segments. Five great masses of fiber cells, surround the haemo-neural muscles h.n. m. l ~', that 

 divide the thoracic yolk mass into five lateral lobes. 



M 



FIG. 150. Same, stage M. Two great masses of fiber cells av., and the remnants of the haemal blastoderm, are seen 



on either side of the cephalic navel, c.nv. 



