PROTOZOA : FORAMINIFERA. 



59 



thereby divided into two great groups (Perforata and Imfier- 

 forata). 



As regards the soft parts of the Foraminifera, the body is 

 composed of extensile and contractile sarcode usually red- 

 dish or yellowish in colour which not only fills the interior of 

 the shell, but generally invests its outer surface also with a thin 

 film, from which the pseudopodia are emitted (fig. 6, b). The 



Fig. 6. Foraminifera. a The animal of Nonionina, after the shell has been removed 

 by a weak acid ; b Gromia (after Schultze), showing the shell surrounded by a 

 network of filaments derived from the body-substance. 



test, therefore, in this case, is not a true cuticular secretion, 

 like that of the Mollusca, but it is truly immersed within the 

 sarcode of the body. The sarcode is not differentiated into a 

 distinct ectosarc and endosarc, and is devoid of a nucleus and 

 contractile vesicle, and, indeed, of any organs or specialised 

 parts of any kind. From this uniformity in its composition 

 there seems some reason to conclude that the Foraminifera 



