GLOSSARY. XIU 



Oocyst. — -A cyst containing the conjugated gametes. 

 Ookinete. — The motile zygote in Hsemosporidia. 



Pansporoblast. — -An enclosed area in a myxosporidian trophozoite in 



which two sporoblasts become differentiated. The term is also 



used to designate in general a grown-up sporont of the polysporous 



genera in which two or many sporoblasts are formed. 

 Parasite. — An organism living in or upon the body of another organism 



and dependent for its existence on that organism or a limited 



groiip of organisms. 

 Piroplasmidea. — Hsemosporidia which do not form pigment in the 



red blood-cells. 

 Planont. — -The stage between free amoebula and schizont stages, which 



are found in the alimentary canal or body-cavity of the host soon 



after the spore gerixiinates. 

 Plasmodium. — Multinucleated cell formed by the repeated divisions 



of the nucleus. 

 Plasmotomy. — Cleavage of a multinucleated body into two or more 



multinucleate parts. 

 Polar capsule. — A sac in which the polar filament is coiled, a structure 



characteristic of a cnidosporidian spore. 

 Polar filainent. — ^A fine and long filament coiled in the polar capsule, 



which is extruded under suitable stimulation. 

 Polycystid. — -Referring to gregarines possessing a septum which divides 



the trophozoite into regions ; also known as " septate." 

 Polymorphic. — Exhibiting a diversity of form. 

 Polysporoblastic. — Producing numerous sporoblasts. 

 Polysporous. — Producing many spores. 

 Posterior end. — -The end of an organism which is habitually behind 



in locomotion. In Cnidosporidia the end of the spore opposite 



to the anterior ; it is usually more or less rounded if the two ends are 



dissimilar. 



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

 Protomerite. — -The portion of a septate gregarine which precedes the 

 septmn. 



Protoplasm. — The physical basis of life, or elementary formative matter 

 of all living organisms. 



Protozoa. — Animals in which the body is not divided into cells. 



Pseudocyst. — ^The residual protoplasm which, after the spores are 

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

 wall bursts, and allows the extrusion of the ripe spores. 



Sarcocyte. — The middle layer of the ectoplasm. 



Sarcosporidia. — Sporozoa in which cysts form long rod-like masses, 



and the spores are crescentic. 

 Satellite. — -Any sporont in an association which is attached behind the 



primite. Generally there is one, but sometimes several are attached 



linearly, one behind the other, or in a cluster to the posterior 



end of the primite. 



Schizogony. — ^Asexual or agamic reproduction by equal, unequal or 

 multiple division. 



Schizogregarinaria. — -Gregarinida showing schizogony. 

 Schizont. — That stage which is about to divide into a number of parts 

 called merozoites. 



