221] STUDIES ON GREGARINES— WATSON 11 



Sarocyte : A middle layer of the ectoplasm. 



Satellite : Any sporont in an association which is attached behind the 

 primite. Generally there is but one, but sometimes several are at- 

 tached in a cluster to the posterior end of the primite or, more gen- 

 erally, arranged linearly one behind the other. 



Septum : The thin layer of sarocyte which separates the two portions of 

 the sporont, the protomerite and the deutomerite. 



Spore : The body into which the zygote develops after the acquisition of 

 a resistant outer coating. 



Spore duct : A tubular outgrowth from the cyst through which the 

 spores are exuded when ripe. 



Sporocyst : The covering or coverings of the spore. 



Sporont : An adult gregarine living free in a cavity and deprived of its 

 epimerite. 



Sporozoite : One of the eight, more or less, small falciform bodies which 

 are released when the spore walls are absorbed. 



Trophozoite : The young parasite which is either entirely intercellular 

 or attached to an epithelial cell of the host by an epimerite. Synony- 

 mous with cephalout. 



Zygote : The body formed from the union of two gametes. 



