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Any small marine gastropod shell of the genus Littorina. The common European species (Littorina littorea), in Europe extensively used as food, has recently become naturalized abundantly on the American coast. See Littorina.

a horseshoe-shaped lophophore, and the mouth is covered by an epistome. Called also Lophopoda, and hippocrepians.

A combining form from Gr. a leaf; as, phyllopod, phyllotaxy.

ody, with the head concealed beneath the thorax. -- Pill bug (Zoöl.), any terrestrial isopod of the genus Armadillo, having the habit of rolling itself into a ball when disturbed. Called also pill wood louse.

Any myriapod of the genus Iulus and allied genera which rolls up spirally; a galleyworm. See Illust. under Myriapod.

Same as Steganopodes.

A division of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora. See Illust. under Chiton, and Isopleura.

Any marine gastropod belonging to Pleurotoma, and ether allied genera of the family Pleurotmidæ. The species are very numerous, especially in tropical seas. The outer lip has usually a posterior notch or slit.

A combining form or suffix from Gr. poy`s, podo`s, foot; as, decapod, an animal having ten feet; phyllopod, an animal having leaflike feet; myriapod, hexapod.

llied to the cod, and like it is salted and dried. In England it is called coalfish, lob, podley, podling, pollack, etc.

One of the two principal groups of Chætopoda. It includes those that have prominent parapodia and fascicles of setæ. See Illust. under Parapodia.

cient or ancestral type. It is remarkable for its simplicity of structure and want of parapodia. It is the type of the order Archiannelida, or Gymnotoma. See Loeven's larva.

Many-chambered; -- applied to shells of Foraminifera and cephalopods. See Illust. of Nautilus.

water lily. See under Water, and Illust. under Nymphæa. -- Pond snail (Zoöl.), any gastropod living in fresh-water ponds or lakes. The most common kinds are air-breathing snails (Pulmonifera) belonging to Limnæa, Physa, Planorbis, and allied genera. The operculated species are pectinibranchs, belonging to Melantho, Va…

es, which are highly esteemed as marbles. Porphyry shell (Zoöl.), a handsome marine gastropod shell (Oliva porphyria), having a dark red or brown polished surface, marked with light spots, like porphyry.

Same as Octopus. Musk poulp (Zoöl.), a Mediterranean octopod (Eledone moschata) which emits a strong odor of musk.

An extensive division of pectinibranchiate gastropods, including those that have a long retractile proboscis, with the mouth at the end, as the cones, whelks, tritons, and cowries. See Illust. of Gastropoda, and of Winkle.

An extinct genus of brachiopods, very characteristic of the Carboniferous rocks.

erior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of Phragmocone.

The highest division, or subclass, of gastropod mollusks, including those that have the gills situated anteriorly, or forward of the heart, and the sexes separate.