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One of numerous species of marine gastropod shells, belonging to Ranella and allied genera.

ectoblast and entoblast, which form respectively the outer covering and inner wall of the gastrula. A third layer of cells, the mesoblast, which is formed later and lies between these two, is sometimes included. -- Germinal membrane. (Biol.) Same as Blastoderm. -- Germinal spot (Biol.), the nucleolus of the ovum. --…

A division of gastropods in which the odontophore is without teeth.

eback. The immature ones are called bluesides. -- Harp shell (Zoöl.), a beautiful marine gastropod shell of the genus Harpa, of several species, found in tropical seas. See Harpa.

An albuminous substance formed in gastric digestion, and by the action of boiling dilute acids on albumin. It is readily convertible into hemipeptone. Called also hemialbumin.

A product of the gastric and pancreatic digestion of albuminous matter.

An order of pelagic Gastropoda, having the foot developed into a median fin. Some of the species are naked; others, as Carinaria and Atlanta, have thin glassy shells.

An artificial division of gastropods, including those that have an entire aperture.

f multicellular organisms, from the same embryonic systems into which the secondary unit (gastrula or plant enbryo) differentiates.

o another organ on which it exerts a stimulating effect; thus, according to Starling, the gastric glands are stimulated by a hormone from the pyloric mucous membrane.

ative calomel, or bichloride of mercury. -- Horn shell (Zoöl.), any long, sharp, spiral, gastropod shell, of the genus Cerithium, and allied genera. -- Horn silver (Min.), cerargyrite. -- Horn slate, a gray, siliceous stone. -- To haul in one's horns, to withdraw some arrogant pretension. [Colloq.] -- To raise, or…

An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera. -- Hy`dro*bran"chi*ate, a.

ion on either side of the abdomen beneath the cartilages of the false ribs, beside the epigastric, and above the lumbar, region.

Any gastropod of the genus Ianthina, of which various species are found living in mid ocean; -- called also purple shell, and violet snail. [Written also janthina.]

passion. See Ileus. -- Iliac region, a region of the abdomen, on either side of the hypogastric regions, and below the lumbar regions.

A suborder of marine gastropod mollusks, in which the gills are between the foot and the mantle.

A central cavity in the Ctenophora, into which the gastric sac leads.

gestive fluid or ferment, etc.; as, the inhibition of the respiratory center by the pneumogastric nerve; the inhibition of reflexes, etc.

ting in inhibition; tending or serving to inhibit; as, the inhibitory action of the pneumogastric on the respiratory center. I would not have you consider these criticisms as inhibitory. Lamb. Inhibitory nerves (Physiol.), those nerves which modify, inhibit, or suppress a motor or secretory act already in progress.…

To supply with nerves; as, the heart is innervated by pneumogastric and sympathetic branches.