Outlines of zoology . e cells of the animals in closephysiological partnership with them (symbiosis). A spatial partnership in which one animal finds habitual shelter withinor near another is not infrequent; small horse-mackerels (CarangidsB)swimming in shelter of large jelly-fish ; a small fish (AtnphiprionHcinctus) inside a giant sea-anemone {Crambactis arabica) which hasa diameter of a foot; another fish (Fierasfer) that goes in and out ofthe hind-gut of Holothurians ; another that lives among the very longhair-like spines of the Red Sea rock-urchin {Diadeina saxatile); andanother (Apo
Outlines of zoology . e cells of the animals in closephysiological partnership with them (symbiosis). A spatial partnership in which one animal finds habitual shelter withinor near another is not infrequent; small horse-mackerels (CarangidsB)swimming in shelter of large jelly-fish ; a small fish (AtnphiprionHcinctus) inside a giant sea-anemone {Crambactis arabica) which hasa diameter of a foot; another fish (Fierasfer) that goes in and out ofthe hind-gut of Holothurians ; another that lives among the very longhair-like spines of the Red Sea rock-urchin {Diadeina saxatile); andanother (Apogonichthys strombi) that spends part of its time in themantle cavity of the large sea-snail (Stronibus gigas) of the Bahamas. The quaint little hydroid Lar sabellarum lives at the mouth of thetubes of the worm Sabella; another hydroid {Stylactis minoi) growsall over the skin of a rock-perch (Minous) from the Indian Ocean;Stylactis vermicola was found on the back ot the worm Aphrodite atthe great depth of 2900 Fig. 93A, A., a minute portion of the branched excretory system of a Plathehninth, showinglongitudinal duct (/), with cilia (C), its branches (// and ///), and the terminalflame-cells (/*); A, one of the characteristic hollow flame-cells, leading intothe excretory tubule (i), showing cilia (2), the excretory globules (3), thenucleus (4), and pseudopodia-like processes (s) passing among adjacent cells. CHAPTER X UNSEGMENTED WORMS Phylum : Chief Classes—Turbellaria, Trematoda, Nemathelminthes : Chief Classes—Nematoda, Nematomorpha, Acanthocephala. The title worms is hardly justifiable except as a con-venient name for a shape. The animals to which thename is applied form a heterogeneous mob, includingabout a dozen classes whose relationships are imperfectlyknown. It is likely that certain worms were the first animalsdefinitely to abandon the more primitive radial symmetry,to begin moving with one part of t
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
