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. 



na 



^-end 



mf 



/IV.C ^ • \ 'y- 



ret 



ntc 



Fig. 54. — Portion of the tentacle of a Zoophyte {Euccfpella). 



In the lower part of the figure are seen the ectoderm cells [eci) with 

 the nematocy.sts (w/c ). In the middle part the ectoderm is removed, and 

 the muscle-fibres {m.f) and nerve-cells i,nv. c) are exposed. In the 

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

 endoderni cells {end) are shown ; nii, 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 



