114 DR, J. STEPHENSON ON THE MORPHOLOGY, CLASSIFICATION, 



Text-ligure 3. Text-figure 4. 



e. 



m. \ 



■. ;''^??" G.'\;'' CfTs. 



A group of sexual cells forming on 

 a strand just in front of a zone 

 of budding in the hinder part 

 of a chain. X 900. 



Text-fioure 5. 



m 





Formation of sexual cells from the cell- 

 proliferation of a budding zone. 

 The subsequent sepai-ation of the 

 individuals would liaA'e taken place 

 between the two groups of pro- 

 liferating cells. X700. 



Text-figure 6. 



/Tpor 



V77<3/r 



Young morula on a strand in the 

 body-cavity. X 850. 



Older morula, still attached to a strand, 

 traversing the ccbIoui, in neighbourhood 

 of a zone of budding. X 430. 



Reference letters for all the above text-figs (2-6) : — 



e. surface epithelium : ff. sexual cells ; m. muscle strands of body-wall ; 

 wior., morula ; p. peritoneal cells ; s. strands traversing coelom ; s. cell- 

 proliferation of budding zone. 



