The royal natural history . denoting the naked condition of the mouth. Thesenaked-mouthed Bryozoans are far more numerous than those with lids to theirmouths. Paludicella, which is fully described on pp. 419, 420, is one of the fewfresh-water forms belono-ino; to this order. Here the crown of tentacles cannot becompletely protruded, and thus appears, even when most extended, to be surroundedby a double collar. A numerous group of this order are the marine Chilostomata,or lip-mouthed Bryozoa, of which the sea-mat (Flustra foliacea), common in theNorth Sea, is an example. The magnified cells sho

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The royal natural history . denoting the naked condition of the mouth. Thesenaked-mouthed Bryozoans are far more numerous than those with lids to theirmouths. Paludicella, which is fully described on pp. 419, 420, is one of the fewfresh-water forms belono-ino; to this order. Here the crown of tentacles cannot becompletely protruded, and thus appears, even when most extended, to be surroundedby a double collar. A numerous group of this order are the marine Chilostomata,or lip-mouthed Bryozoa, of which the sea-mat (Flustra foliacea), common in theNorth Sea, is an example. The magnified cells shown in the illustration representthe harder portion of the animals, into which the soft anterior portions can bewithdrawn. The openings through which the tentacles protrude lie crosswise,and each is provided with a lip-like elastic lid. Each individual can thus takerefuge within its chamber and close the lid. Other genera which, unlike Flustra,have no lid, can close the aperture by means of muscles. The colonies of sea-mats. lace-coral, Lepralia (uat. size) MOSS-ANIMALS. 42;

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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectzoology