8 SYNOPTIC KEY 



2(1, 3, 4) Binucleate amebulae, spore large with three valves 

 and three polar capsules. (Minchin, 409; Calkins, 68.) 



Order Actinomyxidia 



3(1, 2, 4) Spores very minute; the one polar capsule is invisible 

 in the fresh state. Parasites of arthropods. (Minchin, 

 411; Calkins, 67.) Order Microsporidia 



4(1, 2, 3) Young stages in muscle fibers of higher vertebrates. 

 Large saclike spore cases. (Minchin, 419; Calkins, 

 68; Pratt, 48.) Order Sarcosporidia 



Class MASTIGOPHORA (Flagellata) 



1(2, 3) Small Mastigophora with definite anterior and posterior 

 ends one of which bears one or more flagella. Lacking a 

 transverse furrow. Subclass Flagellidia, p. 8 



2(1, 3) With two flagella usually, one of which typically lies in 

 a cross-furrow and the other in a longitudinal furrow 

 directed backward. Sometimes naked and colorless; 

 sometimes with a tabulated armor colored green or 

 brown. Subclass Dinoflagellidia, p. 9 



3(1, 2) Large marine Mastigophora with parenchymatous 

 protoplasm. (Pratt, 41.) Subclass Cystofiagellidia 



Subclass FLAGELLIDIA 



(Key arranged from Pratt) 

 1(14) Body colorless, often more or less ameboid and with 

 one or more flagella. ' 2 



2(3) Body spiral, with or without flagellum and more or 

 less like bacteria. (Pratt, 26; Minchin, 466.) 



Order Spirochetida 



3(2) Body not spiral. 4 



4(5) One flagellum with collar present. (Pratt, 28; W. 

 and W., 257.) Order Choanoflagellidia 



5(4) No collar present. 6 



