Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 RADIOLARIA. 189 Order 3.—RADIOLARIA.* Marine Rhizopoda with complicated differentiation of the sarcode body, with central capsule and radial silicious skeleton. The sarcode body contains a membranous porous capsule (the central capsule}, in which is contained a tough slimy protoplasm with vacuoles and granules (intracapsular sarcode}, fat and oil globules, and albuminous bodies, and more rarely crystals and con- cretions. The intracapsular mass contains also a single large nucleus or sev
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 RADIOLARIA. 189 Order 3.—RADIOLARIA.* Marine Rhizopoda with complicated differentiation of the sarcode body, with central capsule and radial silicious skeleton. The sarcode body contains a membranous porous capsule (the central capsule}, in which is contained a tough slimy protoplasm with vacuoles and granules (intracapsular sarcode}, fat and oil globules, and albuminous bodies, and more rarely crystals and con- cretions. The intracapsular mass contains also a single large nucleus or several small nuclei. The sarcode which surrounds the capsule and which emits on all sides simple or anastomosing pseudopodia, contains numerous yellow cells, sometimes pigment masses : and in • some cases delicate trans- parent vesicles, or alveoli, are found in the peripheral layer between the radia- ting pseudopodia (Thal-as- sicolla pelagica, fig. 129). Many Radio!aria form colonies, and are composed 130.—AefliiJiiiff,-ii Miilleri (after E. Haeckel). of -numerous individuals. In such colonies the al- veoli are placed in the common protoplasm, which contains in it:-elf. not as in the monozoic Radiolaria a single cen- tral capsule, but a number of capsules. Only a few species remain naked and without tirm deposits ; as a rule, the soft body possesses a silicious skeleton, which either lies entirely outside the central capsule (Ectolithia) or is partially within it (Entolithia). In the most simple cases the skeleton consists of small, simple, or toothed silicious needles (spicula) united together, which sometimes give rise to a fine sponge work round the periphery of the proto- plasm, , Pliijseuiatium. In a higher grade we find stronger hollow silicious spicules, which radiate from the middle point of the body to the periphery in regular number and order, , Acanthometra * Job. Miiller. '• Uel>er die Thalassicolleu, Polyeystincu und Acanthometivn.' AbJt. ill-
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