. Cassell's natural history. Animals; Animal behavior. 3C2 NATURAL HISTORY. riiost Infusoria, and the smallest animalcules or monads belonging to the Flagellata have a pale glaucous or fluorescent hvie, and Saville Kent notices that this is visible under high magnifying powers. It is probably dtie to reflected and not to transmitted light. Most of the Flagellata are coloured, and the sjjecies of one great group, the Euglenidse, are of a brilliant green, the colour being diffused in the endoplasm. The colour is identical with that of the lower plants, containing chlorophyll, and it is remarkabl
. Cassell's natural history. Animals; Animal behavior. 3C2 NATURAL HISTORY. riiost Infusoria, and the smallest animalcules or monads belonging to the Flagellata have a pale glaucous or fluorescent hvie, and Saville Kent notices that this is visible under high magnifying powers. It is probably dtie to reflected and not to transmitted light. Most of the Flagellata are coloured, and the sjjecies of one great group, the Euglenidse, are of a brilliant green, the colour being diffused in the endoplasm. The colour is identical with that of the lower plants, containing chlorophyll, and it is remarkable that this green tint should turn to red. Thus in Astasia sanyuinea the green colour, which gives a tint to the water in which the myriads- of the animalcules swim, is. suddenly turned to red, accounting for old and new traditions regarding the turning of water* into l;>lood. Ray Lankester has shown that in the genus Stentor the green matter, like that of Hydra viridis and Sponrjilla, is a chlorophylloid substance similar to that of plants. One Stentor, however, has a blue colouring matter which is produced by a special chemical combination called Stehtorin. Quite as many Infusoria have a diflused pale amber to deep olive colour as green, and most of the Tentaculifera and Cilio-flagellata have these dull colours. Sa\-ille Kent notices that some of the Flagellata differ from the majority by the pi-esence of the olive coloui-ing on two lateral bands on the body. In the Ciliata, a Leucophrys is of a. brilliant crimson colour, and a Nassula has numerous violet granules in its endoplasm. Minute crimson granules have also been noticed iii the contractile tissue of the stalk of Vorticella. In some Euglenidse, thei-e are bodies in the green endoplasm which are of a starchy nature. Finally, there are the accessory structures of the cortical part of some of the Infusoria or the trichocysts. As has been already noticed (p. 3-55), they are visible in Paramecium aivrelia, in the
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