01 

 rospd of r.'" outer Ir.yor of riearor pctorlasn arcl a rrrtral 

 narp of ordorlas- v;hich is d' nso and 0"naqup and fillrd ivith 

 larne, darl: yo].',- r' heron. 



4.:NfatTiratior' and f ertiliration talre rlace in the viator 

 after the epps are de-nosited. It ir. i'-rrj-r-lble to r-ake 

 out cetailn in the livinr eppc because of their o-^aoity. 



5. Cleavage is total and rearly ecual. Ihe first thrcr 

 divisions are fairly regular; hut during the later 

 spgrentatior the arrargerent of the blastcreres beror.es very 

 irregular and erratic. At the ccr-nlet\tion .cf .segmentation a 

 solid rrrula rtage is f erred, i?^ rhich the cell boundaries 

 are lost for a tine giving rise to a syncytiur. 



6. Farts of eggs whirh are d-ivtd^ during the cleavage 

 stages continue to develor ard from larvae which are ncrral 

 in every respect except size, 



7. The ectc(''err is forred by the rean^earance of cell 

 walls in the perinhery of the syrcytiu" '-ass; and is seppratec 

 fro- the interior nart by the fcrTation of the Tesogloea. 



