c 



mtk 



e.c 



Fia. 161. Hormiphora plumosa, diagrammatic sections : A, through ong axis (longitudinal); B, at 

 right angles to long axi.s (horizontal). The ectoderm is dotted, the endoderm striated, the mesogloea 

 black and the muscular axis of the tentacles gray. Lettering as in Fig. 159, except ex. p. excretory pore. 



p 2 



