20 



PROTOZOA. 



SUB-CLASS IV. KADIOLARIA.* 



Marine Gymnomyxa ivitli radiating pseudopodia, central capsule, 

 and usually a skeleton of silica or acantliin. 



The body contains a membranous porous capsule (the central 

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

 granules (intracapsular 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 



\ \ 



F IG 16, Tlwlasslcolla pelagica, with central capsule and single large nucleus, also numerous 

 alveoli 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 (Thalassicolla 

 pelagica. Fig. 16). The yellow cells are Algse living symbiotically with 



* Job. Miiller, "Ueber die Thalassicollen, Polycystinen mid Acanthometren." 

 Abh. der Berl. AJcad. 1858. E. Haeckel, "Die Radiolarien." Erne Monographic, 

 Berlin, 1862. R. Hertwig, "Der Organismus der Radiolarien," 'Jena, 1879. 

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



