

XXII 



STRUCTURE OF COLONY 



237 



that of a Hydra in which the process of budding has 

 gone on to an indefinite extent and without separation of 

 the buds. 



. t 



m:c 



Wf 



FIG. 54. Portion of the tentacle of a Zoophyte (Eucopella). 



In the lower part of the figure are seen the ectoderm cells (ect) with 

 the nematoc>;sts (ntc). In the middle part the ectoderm is removed, and 

 the muscle-fibres (w.f) and nerve-cells (nv. c) are exposed. In the 

 upper part the muscular and nervous layer is removed, and parts of two 

 endoderm cells (end) are shown ; n-n, nucleus. 



(From Parker and Haswell, after von Lendenfeld.) 



There is however an additional layer added in the stem 

 for protective and strengthening purposes. It is evident 

 that a colony of the size shown in Fig. 53, A, would, if formed 



