. Cassell's natural history. Animals; Animal behavior. "41 XXVII.âAnotlier kiiKl of Rhizoiiod, ; iuliabiting frosh water like tlie foregoing, arc tlie Sim-aiiimalcules, or ^ Tliese, liowever, float free in the water, and have round bodies, with delicate pseudopods radiating from all parts of the surface, producing a very gentle gliding movement, and serving to capture prey. The sarcode in these animalcules has usually a yellowish tint, and contains many clear globules or water-cavities, giving it a foamy appearance. Sometimes it is green with either granular
. Cassell's natural history. Animals; Animal behavior. "41 XXVII.âAnotlier kiiKl of Rhizoiiod, ; iuliabiting frosh water like tlie foregoing, arc tlie Sim-aiiimalcules, or ^ Tliese, liowever, float free in the water, and have round bodies, with delicate pseudopods radiating from all parts of the surface, producing a very gentle gliding movement, and serving to capture prey. The sarcode in these animalcules has usually a yellowish tint, and contains many clear globules or water-cavities, giving it a foamy appearance. Sometimes it is green with either granular or diffused chlorophyll, derived fiom minute Al(/(e taken in as food. There are often red spots, also due to Alyce. Besides one oi moie nuclei, theie is a conspicuous contractile or pulsating vesicle (sometimes more than one) ; and this lu its action uses like a bubble above the level of the surface, in some species, and so violently, as to .shake the whole animal and to make the discharge of its con- tents evident in the surrounding water. Their body often presents the appearance of a central granular mass, enclosed in a capsule, but this is much more evident in some of the allied marine The pseudo- podia are thin threads of granular protoplasm, tapering to extremely fine filaments, rarely forked or branching at the ends. Though straight, they are not rigid, but flexible and contractile, drawing the food-atoms they touch towards the body, where the particles are enveloped by the sarcode and taken inside. In some cases the pseudopods are said to be strengthened by an internal axis of tougher matei'ial. Sometimes the animalcule seems to stand, as it were, on the ends of the pseudopods touching the object beneath. Most of the Heliozoa are soft and naked ; but others have an extremely rudimentary skeleton of silicious % spicules in the outer layer of sarcode; and some have a more de- velo(>ed and delicate shell, of the same mineral substance, like lattice
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