HELEN L. M. PIXELL GOODRICH 19 



As regards the life history of Thelohania, I fear that I can add nothing 

 of importance. The sections and films examined show the parasité 

 entirely in the spore stage, The sporocysts easily burst liberating the 

 eight spores as described above. The infected prawn was in a large tank 

 with several lobsters and many other prawns and shrimps and, although 

 nearly ail its muscles were affected, it managed to préserve a certain 

 amount of agility. No other prawn from the acquarium could be found 

 to hâve any trace of infection either in its muscles or blood. 



When put for observation into a smaller tank containing a few fish, 

 a blenny {Blennius) darted out from behind a mass of serpulid tubes 

 and bit the abdomen almost in two, Feeding experiments could not 

 be carried out, however, owing to pressure of other work, and there 

 is no reason to think that the ripe spores would not pass through a blenny 

 unchanged, as did those of Haplosporidium (Minchinia) chitonis (Pixell 

 Goodrich "915 b). Henneguy and Thélohan (1888, 1892) hâve already 

 shown that muscle from a prawn infected with Thelohania octospora can 

 be eaten by healthy prawns without transmitting the infection to them 

 for periods of a month or more. 



University Muséum Oxford, February 1920. 



BIBUOGRAPHY 



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