98 PROTOZOA. 



CLASSIFICATION OF PROTOZOA. 



(CORTICATA.) (GyMNOMYXA.) (CORTICATA.) 



Predominantly 

 ciliated and 



active. 

 Infusorians. 



Predominantly 

 amceVjoid. 



Riiizoi'Oiis. 



Predominantly 



encysted and 



passive. 



Grkgarinids. 



ACINETARIA. 



RADIOLARIA. 



CILIATA. 



Riiynchoflagellata) 

 Dinoflagei.lata. 



FLAGELLATA. 



FORAMINIFERA. 

 Laeyrinthulidea. 



Hei.iozoa. 



LOBOSA. 



GREGARINIDA 



or 

 SPOROZOA. 



Proteomyxa and Mycetozo-A. 

 Primitive Forms. 



SYSTEIMATIC SURVEY. 



A. — Priniiiive Forms. 



1. Proteomyxa. — A class established by Professor Ray Lankester,and 

 described by him as "a lumber room in which obscure, lowly developed, 

 and insufficiently known forms may be kept until they can be otherwise 

 dealt with." They are simple in structure, often parasitic in habit, and 

 protean in their phases. In some no nucleus has yet been detected. 

 They occur in fresh water, in the sea, and parasitically. 



Examples. — Protoiiiyxa. in four (phases : — (a) encysted and breaking 

 up into spores, which (/') are briefly flagellate, (i) sink into amceboid 

 forms, and {d) flow together into a composite '' plasmodium." I'avi- 

 pyrella, parasitic on fresh-water Algaj; Ankeriita, with chlorophyll, on 

 Diatoms. Protoi::enes, the simplest "amceba." Protohathybius, dredged 

 up in masses from the depths. Sehi^cgetics, multiplying by mere 

 breakage. MoiwHa, dividing into beautiful colonies. 



2. Mycetozoa. — Protozoa which live on land and have a fungus-like 

 habit of feeding on decaying vegetable matter. The plasmodial stage 

 in the cycle is predominant. The coated spores are usually produced in 



