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, the 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 Melant…

arieties, 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.

The front part of the thoracic region; the epigastrium.

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.

A product of gastric digestion intermediate between albumin and peptone, identical with hemialbumose.

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.

One of a class of soluble products formed in the digestion of proteids with gastric and pancreatic juice, and also by the hydrolytic action of boiling dilute acids on proteids. Proteoses are divided into the two groups, the primary and secondary proteoses.

A division of gastropod mollusks having the teeth of the radula arranged in long transverse rows, somewhat like the barbs of a feather.

A genus of large marine gastropods having the outer border of the lip divided into lobes; -- called also scorpion shell.

The hair which appears upon the lower part of the hypogastric region at the age of puberty.

e region of the pubes; as, the pubic bone; the pubic region, or the lower part of the hypogastric region. See Pubes.

An extensive division, or sub-class, of hermaphrodite gastropods, in which the mantle cavity is modified into an air- breathing organ, as in Helix, or land snails, Limax, or garden slugs, and many pond snails, as Limnæa and Planorbis.

A genus of marine gastropods, usually having a rough and thick shell. Some species yield a purple dye.

ng, or connected with, a purple-colored secretion; as, the purpuriparous gland of certain gastropods.

A genus of large marine gastropods. having a pear-shaped shell. It includes the fig-shells. See Illust. in Appendix.

et ferment (Physiol. Chem.), a ferment, present in rennet and in variable quantity in the gastric juice of most animals, which has the power of curdling milk. The ferment presumably acts by changing the casein of milk from a soluble to an insoluble form. -- Rennet stomach (Anat.), the fourth stomach, or abomasum, of r…

A divisiom of gastropods; the Pectinibranchiata.

A division of marine gastropods having a retractile proboscis and three longitudinal rows of teeth on the radula. It includes many of the large ornamental shells, as the miters, murices, olives, purpuras, volutes, and whelks. See Illust. in Append.

A division of gastropod mollusks having a large number of long, divergent, hooklike, lingual teeth in each transverse row. It includes the scutibranchs. See Illustration in Appendix.

Any one of very numerous species of small spiral gastropods of the genus Rissoa, or family Rissoidæ, found both in fresh and salt water.