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Gastraea :: Gastraea (n.) A primeval larval form; a double-walled sac from which, according to the hypothesis of Haeckel, man and all other animals, that in the first stages of their individual evolution pass through a two-layered structural stage, or gastrula form, must have descended. This idea constitutes the Gastraea theory of Haeckel. See Gastrula..

Gasteropodous :: Gasteropodous (a.) Same as Gastropodous.

Umbrella :: Umbrella (n.) Any marine tectibranchiate gastropod of the genus Umbrella, having an umbrella-shaped shell; -- called also umbrella shell..

Gastrura :: Gastrura (n. pl.) See Stomatopoda.

Drill :: Drill (n.) A marine gastropod, of several species, which kills oysters and other bivalves by drilling holes through the shell. The most destructive kind is Urosalpinx cinerea..

Scutibranchiata :: Scutibranchiata (n. pl.) An order of gastropod Mollusca having a heart with two auricles and one ventricle. The shell may be either spiral or shieldlike.

Gastronomic :: Gastronomic (a.) Alt. of Gastronomica.

Valvata :: Valvata (n.) A genus of small spiral fresh-water gastropods having an operculum.

Gastrohepatic :: Gastrohepatic (a.) Pertaining to the stomach and liver; hepatogastric; as, the gastrohepatic, or lesser, omentum..

Fissurella :: Fissurella (n.) A genus of marine gastropod mollusks, having a conical or limpetlike shell, with an opening at the apex; -- called also keyhole limpet..

Winkle :: Winkle (n.) Any one of various marine spiral gastropods, esp., in the United States, either of two species of Fulgar (F. canaliculata, and F. carica)..

Trypsin :: Trypsin (n.) A proteolytic ferment, or enzyme, present in the pancreatic juice. Unlike the pepsin of the gastric juice, it acts in a neutral or alkaline fluid, and not only converts the albuminous matter of the food into soluble peptones, but also, in part, into leucin and tyrosin..

Agast :: Agast (p. p. & a.) See Aghast.

Pubes :: Pubes (n.) The hair which appears upon the lower part of the hypogastric region at the age of puberty.

Hydrobranchiata :: Hydrobranchiata (n. pl.) An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera..

Gastroelytrotomy :: Gastroelytrotomy (n.) The operation of cutting into the upper part of the vagina, through the abdomen (without opening the peritoneum), for the purpose of removing a fetus. It is a substitute for the Caesarean operation, and less dangerous..

Phacellus :: Phacellus (n.) One of the filaments on the inner surface of the gastric cavity of certain jellyfishes.

Auriculated :: Auriculated (a.) Having ears or appendages like ears; eared. Esp.: (a) (Bot.) Having lobes or appendages like the ear; shaped like the ear; auricled. (b) (Zool.) Having an angular projection on one or both sides, as in certain bivalve shells, the foot of some gastropods, etc..

Heteropoda :: Heteropoda (n. pl.) 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..

Gastroepiploic :: Gastroepiploic (a.) Of or pertaining to the stomach and omentum.

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