. Géographie animale écologique ; une édition autorisée, réécrite en fonction de Tiergeographie ockologischer auf Grundlage. Zoogéographie -- distribution géographique ; l'écologie animale. L'PELAGIAL 237 à la taille de ptéropodes, forme la nourriture des plus grands pélagiques. Afin d'obtenir leur nourriture, ce qui est minuscule par rapport à eux-mêmes, le plancton besoin d'appareil spécial qui a été développé à partir de convergently origines différentes dans des structures similaires avec comme des fonctions. Lohmann19 divise le plancton en trois groupes, ceux qui se nourrissent à l'aide de tentacules, ces w

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. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage. Zoogeography -- Geographical distribution; Animal ecology. THE PELAGIAL 237 to the size of pteropods, form the food of the larger pelagic animals. In order to secure their food, which is minute as compared with them- selves, the plankton feeders require special apparatus which has been convergently developed from different origins into similar structures with like functions. Lohmann19 divides the plankton feeders into three groups, those which feed by means of tentacles, those which produce a current of water, and those which hunt actively. The most primitive type is that of the tentacle feeders, which feel about for their food while remain- ing at rest. The radiolarians and Foraminifera do this with their radiating pseudopods, which paralyze their minute food by a poison. The long tentacles of siphonophores (up to 30 m.) serve the same. Fig. 60.—The appendiculate Oikopleura albicans (black) in its house. To the left of the animal is the permanently outspread net. The black arrows show the direction of the currents of water produced by the undulation of the tail. The light arrow beneath points in the direction in which the animal moves. After Lohmann. purpose. The cephalopod Chiroteuthis has its sucking disks trans- formed for this purpose into sticky threads, from which the food is removed by the specially adapted lips.20 The most singular means of securing food is that of the animals which strain out the living forms from a stream of water which they produce themselves. Nets or screens are produced for this purpose. The bristles of the mouth parts of Cladocera and copepods (Fig. 59), the slime bands in the body cavities of salpas and pyrosomas, the remark- able apparatus of the appendiculates, built up out of jelly-threads (Fig. 60), the screen-like gill strainers of the plankton-eating fishes, such as the herring or the giant sharks, and the bale

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