10 ILLINOIS BIOLOGICAL MONOGRAPHS [220 



Liihe (1903) and Sokolow (1911 and 1912) have given particular 

 attention to the physiology, morphology and reproduction of gregarines 

 in general. 



A LIST OP TERMS USED IN DESCRIBING GREGARINES 



Association : The group formed by the attachment of two or more 

 sporonts. 



Biassociative : The adjective referring to an association of two sporonts 

 attached by unlike ends. 



Cephaline gregarine : One which possesses an epimerite at some stage 

 in its life history. 



Cephalont: A term applied to the young gregarine with an epimerite. 



Cyst : The structureless covering secreted by the associated sporonts at 

 the beginning of reproduction. 



Deutomerite : The portion of a sporont which is preceded by the septum. 



Ectoplasm: The outer zone of the body comprising the epicyte, sarco- 

 cyte and myocyte. 



Endoplasm: The granular protoplasm found ^vithin the ectoplasm. 



Epicyte : The thin, fragile, external layer of the ectoplasm. 



Epimerite : The temporary or rarely permanent structure at the ante- 

 rior end of the protomerite by which the young parasite is attached 

 to the host cell. It is derived from the epicyte. 



Isogametes: Gametes which are morphologically identical. Present in 

 most gregarines. 



Karyosome: A chromatic mass surrounded by plastin and contained 

 within the nucleus. The young individuals possess a single karyo- 

 some which often buds off others as the animals increase in size. 



Longitudinal striations : The very delicate ridges which are on the out- 

 side of the epicyte. 



Myocyte : An hypothetical ectoplasmie layer consisting of the myo- 

 nemes. 



Myonemes: The network of contracile fibrillae embedded in the peri- 

 phery of the endocyte and running around the animal crosswise. 

 They produce movement. 



Octozoic Spore : A spore containing eight sporozoites. 



Polycystid : A term applied to gregarines possessing a septum which di- 

 vides the endocyte into regions. Infrequently more than one sep- 

 tum is present. 



Primite : The first individual in an association of two or more sporonts. 



Protomerite : The portion of a sporont which precedes the septum. 



Pseudocyst: The residual protoplasm which after the spores are sepa- 

 rated acquires a membranous wall, swells until the true cyst-wall 

 bursts and allows the extrusion of the ripe spores. 



