. Cassell's natural history. Animals; Animal behavior. 374 NATURAL HISTORY. The second sub-order comprehends Saville Kent's division of the collared monads {Choano-Jiagellatd), with individuals varying from xtrVo*'^! *° TffVo^'^ °f '"â '^ vcich. in length, and some of which resemble the collared cells of sjsonges. It consists of three families. In the first the animalcules are naked, and either attached or free; the genera Mouosiga, Codosiga, and Astrosiga are examples (Plate 72, Figs. 1â8). The forms of the second have a lorica, which may be solitary, as in Salpingseca and Lagenseca, a
. Cassell's natural history. Animals; Animal behavior. 374 NATURAL HISTORY. The second sub-order comprehends Saville Kent's division of the collared monads {Choano-Jiagellatd), with individuals varying from xtrVo*'^! *° TffVo^'^ °f '"â '^ vcich. in length, and some of which resemble the collared cells of sjsonges. It consists of three families. In the first the animalcules are naked, and either attached or free; the genera Mouosiga, Codosiga, and Astrosiga are examples (Plate 72, Figs. 1â8). The forms of the second have a lorica, which may be solitary, as in Salpingseca and Lagenseca, and united in Polynseca (Plate 72, Figs. 9â18). In the sub-order of the Flagellata, with a definite region for inception of food (Eustomata), the most interesting examples are the genera Noctiluca and Euglena. The first is one of the greatest producers of the phosphorescence of the sea. Noctihica miliaris, from ^j^th to ^jjt\\ of an inch in diameter, is peach-shaped, and has a distinct meridional gi-oove to its hyaline body. The mouth fossa is at one end of the groove, and has on one side a. NKIILLCV MILI\RIS B, SAME \MTH BIDS (/ m Pllofojl 03 h ofil B uol ) C IN SECTION (-ijte^ HluUj ) n, nucleus; /, Hagellum; (, tentacle; d, denticle; an. anus. hard projecting ridge, close to one end of which arises theflagellum. Close by arises a tentacle about as long as the body, and there is a rod-like induration of the cuticle, extending in a straight line from the aboral extremity of the groove. The endoplast is oval. They exist in countless multitudes, and theii- greenish-silvery light is produced just underneath the cuticle in irregular flashes. They increase by transverse fission, accompanied by encystment and loss of the flagellum and tentacle. Under certain circumstances, the endoplast breaks up, and the protoplasmic contents of the cyst collect in one spot and form by division into many minute nodular masses. These cause the cuticle to rise, and finally they penetrate it and
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