242 



EARLY STAGES OF ARTHROPOD AND VERTEBRATE EMBRYOS. 



Lkr 



op.p 



il. 



FIG. 149. Same, stage L, seen from the haemal 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. 1-5 , that 

 divide the thoracic volk mass into five lateral lobes. 



hum 



.mxm. 



FIG. 150. Same, stage M. Two great masses of fiber cells at 1 ., and the remnants of the haemal blastoderm, are seen 



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



