THE PROTO/OA 



149 



Fig. 65. 



A. to H. Isolated Nucleus of Thalassicola nucleata Hux. (After Verworn.) 



A. to D. Regenerative changes. 



E. to H. Degenerative changes. 



I. Actinomonas Pusilla (Kent) n, nucleus; /, flagellum ; p, pseudopoJia. 



chitinous shell. The shells of many Foraminifera consist of numerous 

 chambers connected by openings (foramina), and are composed of cal- 

 cium carbonate. When these shells sink to the sea-bottom, they become 

 Globigerina ooze, which solidifies, forming gray chalk. 



14. The Mastigophora ( ) may easily be dis- 



tinguished from other Protozoa by the presence of one or more flagella. 

 Four orders are usually recognized: (1) Flagellata, 

 (2) Choanaflagellata, (3) Dinoflagellata, (4) Cysto- 

 flagellata. 



15. Order 1. Flagellata ( ) 



Mastigophora with one or more flagella at the an- 

 terior end of the body. 



Examples : Euglena, Mastigamoeba, Chilomo- 

 nos, Uroglena, Volvox. (Fig. 67.) 

 Fig. 66. Mastigameba ( ) is of 



Protoplasm of Giabi- special interest, since it appears to combine the dis- 



<jerina, after the shell has f . . . r . 



been dissolved, n, nu- tiiipfiiishing' characteristics ot both -the Rhizopoda 



cleus. (After Hertwig.) V - , . , . . 



and Mastigophora, that is, it possesses pseudopodia 





Fig. 67. 



A. Uroglena americana Calkins, a sphaeroid colony. 



B. Mastigamoeba aspera. (After Schultze). 



