124 



ERNEST WARREN. 



cells in the two layers. The brown bodies would appear to 

 be dead, and an empty space often surrounds a considerable 

 portion of a body (fig. a). Whether these spaces occur in the 

 living tissue, resulting from the contracting away of the living 



Text-fig. 9. 



D 





Sertularia loculosa Busk. Fig. A. x 1150. Fig. B, x 1900. 

 Figs. c-G, X 2500. 



cytoplasm from the dead body, or whether they are shrinkage 

 spaces arising during fixation, it is not possible to detei-mine. 

 There is no evidence that we are here dealing with a parasitic 

 organism, or that the bodies are produced through the 

 poisoning action of bacteria. The bodies in question appear 

 to be undoubted transformations of hydroid protoplasm, 

 resulting from untoAvard stimuli. 



