PORAMINIFERA. 



25 



thrown out in all directions, is a type ; liotalia veiieta (Fig. 

 14) is another example. 



The Foraminifera are nucleated. DqAojihrys multiplies 

 by a " process of con- 

 tinuous binary fis- 

 sion." Miliola gives 

 rise to small round, 

 sharply - defined bod- 

 ies, in calcareous 

 shells, with one turn, 

 but no inner walls, 

 and with pseudopo- 

 dia like those of the 

 adult. Microgromia so- 

 cialis multiplies by zo- 

 ospores, which are oval, 

 with two fiagella ; or, 

 in other cases, the 



Pig. 13. — A Foraminifer. 

 magnified 70 diameters. 



Globigerina bulloides^ 

 —From Macallister. 



voung assume an actinophrys-like form, and move about by 

 the aid of three or four more or less branched pointed pseudo- 

 pods (Hertwig). 

 In some forms, 

 as the fossil 

 Nummulites, the 

 chambers are 

 numerous and 

 regular, the 



shells being flat 

 and consisting 

 of eight coils sit- 

 uated in the 

 same plane. A 

 recent species of 

 Fo r amin i f er 

 found at Borneo 

 measures more 

 than two inches 



Fig. U.—Botcdia. A Rhizopod, showing the pseudopodia. 



in diameter, while a common form on the Florida reefs, de- 

 voured in large quantities by the Holothuria, or sea-cucum- 



