CHAPTER VIII THE FORMS OF TISSUES OR CELL-AGGREGATES ( continued )

(After Conklin.)

Fig. 163. Egg of Pyrosoma . (After Korotneff). Fig. 164. Egg of Echinus , segmenting under pressure. (After Driesch.)

In the accompanying series of figures (Figs. 160〓167) I have {378} set forth a few aggregates of eight cells, mostly from drawings of segmenting eggs. In some cases they