28 DAVENPORT ACADEMY OF SCIENCES. 



HETEROMASTIGIDA. 



Flagella two or more, one directed forward. Bodies transpar- 

 ent and often very plastic. 



POLYMASTIGIDA. 



Flagella often numerous, at the base of which food is ingested, 

 there being no distinct mouth. 



EUGIvENIDA. 



Flagella one or two at the base of which is a mouth. Often 

 possessing chlorophyl. 



PHYTOFEAGEEEIDA. 



Plant-like flagellates with or without color. An indurated 

 membrane or shell sometimes present. Flagella one or more. 



Orders of DINOFLAGELLIDIA. 



DINIFERIDA. 



Body with two transverse furrows. Members of other orders 

 of the sub-class not likely to occur in fresh water. 



Families and Genera of Monadida. 



Rhizomastigid^. 



With amoeboid body capable of forming pseudopodia. One or 

 more flagella. No distinct mouth. 



Mastigamccba Schultze. 



Acinetadis Stokes. 



^Cercobodo Krass. 



Two flagella, one trailing. 



^■^-Cerco7no)ias Dw]. 



Form changeable but usually pointed behind. Flagellum single. 



Heteromonadid^. 



Small, transparent flagellates wath one prominent flagellum 

 and one or more smaller ones. Sometimes forming colonies. 



Anthophysa Bory d. St. V. 



■^Monas Stein. ' • 



Body more or less spherical or oval, sometimes attached by the 

 narrow posterior extremity. Not forming colonies. 



