Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 EADIOLAEIA. 189 Order 3.—RadioLaria.* Ifarine Ehizojjoda with comjjlicated differentiation of the sarcode body, loith 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 intrac
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 EADIOLAEIA. 189 Order 3.—RadioLaria.* Ifarine Ehizojjoda with comjjlicated differentiation of the sarcode body, loith 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 {Tlialas- sicolla 2)elagica, fig. 129). Many Radiol aria form colonies, and are composed of numerous individuals. In such colonies the al- veoli are placed in the common protoplasm, which contains in itself, not as in the monozoic Radiolaria a single cen- tral capsule, but a number of capsules. Only a few species remain naked and without firm 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, , Physematium. 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 * Joh. Mliller, ' Ueber die Thalassicollen. Polycystinen und Acanthometren,' Alh. dcr Bcrl. AMcl. 1858.
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