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Surrounding the stomach; -- applied to the body cavity of Bryozoa and various other Invertebrata.

The entire covering of an invertebrate animal, as echinoderm or coelenterate; the integument.

The membrane surrounding the mouth of an invertebrate animal.

A group of invertebrates including the Tunicata and Enteropneusta. -- Pha*ryn`gop*neus"tal, a.

A chitinous structure which supports the gill in some invertebrates.

A grand division of the Invertebrata, including the sponges; -- called also Spongiæ, Spongida, and Spongiozoa. The principal divisions are Calcispongiæ, Keratosa or Fibrospongiæ, and Silicea.

al tone with an auxiliary tone above it, usually the next of the scale; --called also the inverted mordente.

Having that first which ought to be last; inverted in order. [Obs.] The method I take may be censured as preposterous, because I thus treat last of the antediluvian earth, which was first in the order of nature. Woodward.

or forming, the front of the head. Procephalic lobe (Zoöl.), that part of the head of an invertebrate animal which is in front of the mouth.

Any contractile vessel of invertebrates which is not of the nature of a real heart, especially one of those pertaining to the excretory system.

A posterior division of the stomach in some invertebrates.

the blank spaces at the beginning and end of chapters, etc. Quotation marks (Print.), two inverted commas placed at the beginning, and two apostrophes at the end, of a passage quoted from an author in his own words.

An extensive artificial group of invertebrates, having all the parts arranged radially around the vertical axis of the body, and the various organs repeated symmetrically in each ray or spheromere.

of 4; 1/(a + b) is the reciprocal of a + b. The reciprocal of a fraction is the fraction inverted, or the denominator divided by the numerator.

Inverted in position; appearing to be upside down or reversed, as the flowers of the orchis and the leaves of some plants.

That part of the eye of an invertebrate which corresponds in function with the retina of a vertebrate.

four united cells which occupy the axial part of the ocelli, or ommatidia, of the eyes of invertebrates, and contain the terminal nerve fibrillæ. See Illust. under Ommatidium.

One of the group of pigmented cells which surround the retinophoræ of invertebrates. See Illust. under Ommatidium.

reversing; the causing to move or face in an opposite direction, or to stand or lie in an inverted position; as, the reversal of a rotating wheel; the reversal of objects by a convex lens.

To turn upside down; to invert. A pyramid reversed may stand upon his point if balanced by admirable skill. Sir W. Temple.