. Elementary botany. Botany. 166 MORPHOLOGY. Class Peridineae. These are peculiar one-celled organisms pro^â idccl with two flagella and show some relationship to the Flagellates. They usually are provided with a cellulose memhrane, which in some ffjrins consists of curiousl}' sculptured plates. In the higher forms this cellulose memfirane consists of two valves fitting together in such a way as to resemble .some of the diatoms. Like the Flagellates, some ha^"c green chromatophores, ^\"hich in some are obscured by a yellow or brown pigment (resemlihng the diatoms), while still
. Elementary botany. Botany. 166 MORPHOLOGY. Class Peridineae. These are peculiar one-celled organisms pro^â idccl with two flagella and show some relationship to the Flagellates. They usually are provided with a cellulose memhrane, which in some ffjrins consists of curiousl}' sculptured plates. In the higher forms this cellulose memfirane consists of two valves fitting together in such a way as to resemble .some of the diatoms. Like the Flagellates, some ha^"c green chromatophores, ^\"hich in some are obscured by a yellow or brown pigment (resemlihng the diatoms), while still others have no chlorophyll. The Peridineie are abundant in the sea, while some are found in fresh water. Class Diatomaphyceae (Bacillariales, Diatomaceee). 3586. The diatoms are minute and peculiar organisms believed to be algje. They live in fresh, brackish, and salt water. I'hey are often found covering the surface of rocks, stii ks, or the scjil in thin .sheets. They occur singlv and free, or se^â eral indiN'iduals ma\' V)e joined into long threads, or other species may be attached to objects by slender gelatinous stalks. Each a It c d i '.. Fig. lyra. A nf Di:it'irns: c and d, tup and side views of the same form; p, colony of stalked Innris attached to an alga: f and ^', top and side views itf thr fnrm sliown at e; /i, a ci tli"in\'; i, a cijlnny, the ti>i' and siilc \ic\v wn at k and i;, fi Tming aux< i- spores. (.\ftcr Jvfrntr.) is enclosed in a silicified skeleton in the form of a box with two halves, often shaped like an old-fashioned |iill box, one half titling o\er the other like the lid of a It is e\ideiU that in this condition the plant cannot ini rease much in size. They multiply by fission. 'I'his takes place longitudinally, , in the direction of the two halves or vnjvcs of the box. I\ach new ytlant then has a vah-e onh' on cme side. .\ new \alve is now formed o\er the naked half, and fits inside the old \Td\'e. .\[
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