CLASSIFICATION OF PROTOZOA. 



10- 



matter flows out in changeful threads or " pseudopodia," as 

 in the common Amceba, are comparable with the white 

 blood corpuscles or leucocytes, many young ova, and other 

 " am&boid" cells of higher animals; (b} the Infusorians, 

 which have a definite rind and bear motile lashes (cilia 

 or flagella), e.g. the common Paramceciuui, may be likened 

 to the cells of ciliated epithelium, or to the active sperma- 

 tozoa of higher animals ; (c) the parasitic Sporozoa, which 

 have a rind and no motile processes or outflowings, may 



(CORTICATA.) 



Predominantly 

 ciliated and 



active. 

 INFUSORIANS. 



CLASSIFICATION OF PROTOZOA. 

 (GYMNOMYXA.) 



Predominantly 

 amoeboid. 



RHIZOPODS. 



(CORTICATA.) 



Predominantly 

 encysted and 



passive. 

 SPOROZOA. 



ACINETARIA. 



RADIOLARIA. 



CILIATA. 



DlNOFLAGELLATA. 



FLAGELLATA. 



FORAMINIFERA. 



LABYRINTHULIDKA. 

 HELIOZOA. 

 LOBOSA. 



SPOROZOA 



GREGARINIDA. 



1'ROTEOMVXA and MVCEIOZOA. 



PRIMITIVE FORMS. 



be compared to degenerate muscle cells, or to mature ova, 

 or to "encysted" passive cells in higher animals. 



This comparison has been worked out by Professor Geddes, who also 

 points out that the classification represents the three physiological 

 possibilities (a] the Armeboid units, neither very active nor very passive, 

 form a median compromise ; (/') the ciliated Infusorians, which are 



