494 



PROTOZOA. 



chambers, and in the shell are many pores through 

 which the pseudopodia are extended (747, 749). 



Some forms, however, which are closely allied to the 

 Foraminifera, even if they are not included in the same 

 group, have only one chamber in the shell. Such are 

 Diffiuyia, Arcella, etc. (Fig. 751). 



FIG. 751. 



D 



E 



Various forms ol simple Khizopods. 



A. Difflugia proteiformis ; B, D. oblonga; C, Arcella acuminata ; D, A. dentata; E, 

 Lagena slriata (fossil). Magnified. 



Sun-animalcule, AcHnophrys sol, under diSereut ^Liases. 

 A, the ordinary form. Magnified. 



Still other forms, as Amaiba (Fig. 740), and Actino- 



