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Asserting that a thing is; -- opposed to problematical and apodeictical.

A genus of small glassy heteropod mollusks found swimming at the surface in mid ocean. See Heteropod.

A kind of chætopod larva in which no circles of cilia are developed.

A extinct genus of Branchiopoda, very common in Silurian limestones.

ed by a gimlet. It has a handle placed crosswise by which it is turned with both hands. A pod auger is one with a straight channel or groove, like the half of a bean pod. A screw auger has a twisted blade, by the spiral groove of which the chips are discharge.

lar projection on one or both sides, as in certain bivalve shells, the foot of some gastropods, etc. Auriculate leaf, one having small appended leaves or lobes on each side of its petiole or base.

A cephalopod of the extinct genus Baculites, found fossil in the Cretaceous rocks. It is like an uncoiled ammonite.

One of the somites (arthromeres) that make up the thorax of Arthropods. Packard.

The thorax of Arthropods. Packard.

m or support on shipboard. -- Mountain barometer, a portable mercurial barometer with tripod support, and long scale, for measuring heights. -- Siphon barometer, a barometer having a tube bent like a hook with the longer leg closed at the top. The height of the mercury in the longer leg shows the pressure of the atmo…

fragrant herbs Calamintha Acinos and C. Nepeta. -- Wild basil, a plant (Calamintha clinopodium) of the Mint family.

or pebbly shore; the strand. Beach flea (Zoöl.), the common name of many species of amphipod Crustacea, of the family Orchestidæ, living on the sea beaches, and leaping like fleas. -- Beach grass (Bot.), a coarse grass (Ammophila arundinacea), growing on the sandy shores of lakes and seas, which, by its interlaced ru…

de, into a delicate concave blade; the thunderstone. It is the internal shell of a cephalopod related to the sepia, and belonging to an extinct family. The belemnites are found in rocks of the Jurassic and Cretaceous ages. -- Bel*em*nit"ic, a.

A genus of fossil univalve shells, believed to belong to the Heteropoda, peculiar to the Paleozoic age.

A papilionaceous plant, the Ornithopus, having a curved, cylindrical pod tipped with a short, clawlike point. Bird's-foot trefoil. (Bot.) (a) A genus of plants (Lotus) with clawlike pods. L. corniculatas, with yellow flowers, is very common in Great Britain.

Goutweed (Ægopodium podagraria).

Having two valves, as the oyster and some seed pods; bivalve.

Bladder nut, or Bladder tree (Bot.), a genus of plants (Staphylea) with bladderlike seed pods. -- Bladder pod (Bot.), a genus of low herbs (Vesicaria) with inflated seed pods. -- Bladdor senna (Bot.), a genus of shrubs (Colutea), with membranaceous, inflated pods. -- Bladder worm (Zoöl.), the larva of any species o…

A marine gastropod of the genus Crepidula. The species are numerous. It is so named from its form and interior deck.

The pod or capsule of a plant, as of flax or cotton; a pericarp of a globular form.