FORA M1NIFERA . 



Fig. 13. A Foraminifer. Glofngerina bulloides, 

 magnified 7'0 diameters. From MacallLster. 



thrown out in all directions, is a type ; Rot alia vcneta (Fig. 

 14) is another example. 



The Foraminifera are nucleated. Diploplirys multiplies 

 by a " process of con- 

 tinuous binary fis- 

 sion." Miliola gives 

 rise to small round, 

 sharply - denned bod- 

 ies, in calcareous 

 shells, with one turn, 

 but no inner Avails, 

 and Avith pseudopo- 

 dia like those of the 

 adult. Microgromia so- 

 rittlis multiplies byzo- 

 ospores,Avhich are oval, 

 Avith tAvo flagella ; or, 

 in other cases, the 

 young 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 

 Foraminifer 

 found at Borneo 

 measures more 

 than two inches 

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

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



// 



''if In 



Fig. \\.-RoMia. A Rhizopod, showing the pscudopodia. 



