FLAGELLATE PROTOZOA (MASTIGOPHORA) 



269 



198 (195) Protoplasmic processes connecting cells usually distinct. Poles 



of colony not differentiated by arrangement of vegetative 

 and gonidial cells Volwx Leeuwenhoek . . 199 



199 (204) Colonies with distinct protoplasmic processes connecting the 



cells 200 



200 (203) Protoplasmic processes very stout 201 



201 (202) Colonies dioecious Volwx perglobator Powers 1908. 



Colonies often exceeding i mm. in diameter. Ova or 

 oosperms not infrequently numbering several hundred in a 

 colony. Very common in the United States. 



FIG. 452. Vohox perglobator. Colony with eight daughter coenobia. 

 Cilia and protoplasmic processes not shown. X 50. (From a 

 prepared mount). 



202 (201) Colonies monoecious Vohox globator Leeuwenhoek 1788. 



The common European species. About one-half the size of the preceding species, and con- 

 taining fewer reproductive cells. This species probably occurs in the United States but, if so, 

 in much less abundance than Vohox perglobator. 



203 (200) Protoplasmic processes slender. . Vohox aureus Ehrenberg 1838. 

 A typical European species but probably occurring in the United States also. Diameter 



about 850 M. 



204 (199) 



Colonies app 

 the eel 



irently without protoplasmic processes connecting 

 > Vohox spermatosphara Powers 1908. 



Monoecious forms with ripe sperms arranged in bundles 

 of 32, grouped in sperm spheres in the colonies Mature 

 colonies often exceed 600 n in diameter. Widely dis- 

 tributed in the United States. 



FIG. 453. Volwx spermatosphara. Colony with two daughter 

 coenobia, five egg cells and one sphere of sperm bundles. 

 X 80, (From a specimen.) 



2 5 (i3 2 ) Usually with an outer membrane or shell in the form of plates; 

 body usually furrowed; flagella two. Usually colored. 



Subclass Dinoflagellida . . 206 



206 (209) Without a membrane around the body 207 



207 (208) Cross furrow extending only around the left side; a longitudinal 



furrow extending from the central end of the cross furrow to 

 the under part of the body Hemidinium Stein. 



