56 



Figures 18 - 21 sho;v a few of the latnr stages of co^nDar- 

 ativoly very regular for:iis. Figure 20 reriresents an egg in 

 which the blastomeres are arranged in tv/o ^rain grouris held 

 together by ajnarrow isthmus of only one cell in thickness. 

 Some eggs were separated into three or four thickened clus- 

 ters that vrere .I'oined tbgether by small nasses of conner-t- 

 ing cells. In others there were smaller grou'DS of blasto- 

 meres nrojecting out fro- the general r.ass of cells, thus 

 giving the './hole sonev/hat of an a'neboid ar»r)earance. The 

 tern; amoeba-like seens to lost clearly represent the shane 

 which soTe of these late segmentation stages assume, for 

 if a simDle outline of these remarkable a^^d grotesque forms 

 is drawn it has a general resemblance to an a-^oeba with thic!: 

 blunt nseudonods, V.'hether these irregularities in the sbape 

 of the egg during late segmentation, and tie tendency of 

 the cells to arrange the-^selves into '-ore or less distinct 

 lobes is 'lue to an amoeboid proT^erty of the cytonlasr of 

 the egg, or to a tondoncy to multiply by division during 

 cleavage, as was suggested by iMetschnikoff fcr Ocea nia ar- 



