20 



PROTOZOA. 



SUB-CLASS IV. KADIOLABIA.* 



Marine Gh/innomyxa with radiating pseudopodia, central capsule, 

 1 1 nil usual I n a skeleton of silica or acantlrin. 



The body contains a membranous porous capsule (the central 

 capsule), in which is contained a slimy protoplasm with vacuoles and 

 granules (infracapsular sarcode), fat and oil globules, and albuminous 

 bodies, and more rarely crystals and concretions. The intracapsular 

 mass contains also a single large nucleus or several small nuclei. The 



FIG. 16. TlialassicoUa ficluriim, with central capsule and single large nucleus, also numerous 

 alveuli in the protoplasm (after E. Haeckel). 



extracapsular sarcode which communicates with the intracapsular 

 through the pores in the capsule, and which emits on all sides simple 

 or anastomosing pseudopodia, contains numerous yellow cells, some- 

 times pigment masses ; and in some cases it is much vacuolated like 

 the external protoplasm of some pelagic Foraminifera (TlialassicoUa 

 ^e/agica. Fig. 16). The yellow cells are Algae living symbiotic ally with 



* Job. Miiller, " Uel.ier die Thalassicollen, Polycystinen und Acanthometren." 

 Abh. dcr Bcrl. Akad. 1858. E. Haeckel, "Die Radiolarien." Eine Monographic, 

 Berlin, 186'2. R. Hertwig, " Der Organismus dcr Radiolarien," Jena, 1879. 

 E. Haeckel, " Report on the Radiolaria." Challenger Reports, 1887. 



