xiv GLOSSARY. 



Schizontocyte. — A special form of agamont which breaks up into a 



number of agamete-forming centres by multiple division. 

 Septata. — Gregarines in which the trophozoite is divided by an ecto- 



plasmic septum. 

 Septum. — The thin layer of sarcocyte which separates the protomerite 



from the deutomerite. 

 Siliceous. — -Partaking of the nature and qualities of silica ; composed 



of flint. 

 Spore. — The body into which the zygote develops after the acquisition 



of a resistant outer coating. 

 Spore-duct. — A tubular growth from the cyst, through which the spores 



are extruded when ripe. 

 Sporoblast. — A product of the initial reproduction of the zygote, 



including both capsule and contents ; a cell which develops 



directly into a spore. 

 Sporocyst. — The covering or coverings of the spore. Sometimes used 



in the same sense as a spore. 

 JSporogony. — The development of spores from the sporont. 

 Sporont. — An adult sporozoan which is destined to form gametes or 



to give rise to sporoblasts. 

 Sporoplasm. — The protoplasmic mass inside the spore ; the sporozoite 



of a Cnidosporidian spore. 

 Sporozoa. — A class of the Protozoa in which spore-formation is the 



prevailing mode of reproduction. 

 Sporozoite. — Each of the small falciform bodies which are released when 



the spore-wall is absorbed. 

 Sporulation or multiple fission. — -Mode of reproduction in which the 



repeated division of the nucleus is followed by the splitting of the 



organism into as many parts as the nuclei. 

 Syngamy. — Sexual union or conjugation involving a complete fusion 



of two gametes. 

 Synkaryon. — The combination nucleus resulting from the fusion of 



two nuclei derived from two individuals. 

 Syzygy. — Linear chains formed by two or more organisms attached 



end to end. 



Telosporidia. — -Sporozoa with trophic and reproductive phases typically 

 distinct. Term used by Schaudinn to include Gregarinida, 

 Coccidia, and Hsemosporidia. 



Tetrasporoblastic. — Producing four sporoblasts. 



Tetrasporous. — Producing four spores. 



Tetrazoic spore. — A spore containing four sporozoites. 



Trophozoite. — -The young feeding and growing parasite. 



Vacuolate. — Having a number of clear spaces or vacuoles. 

 Vermicular. — -Resembling a worm in shape. 



Zygote. — The cell resulting from the complete fusion of two gametes. 



