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A narrow and elongated aperture; a cleft; a fissure.

d also perch, and pole. Black rod. See in the Vocabulary. -- Rods and cones (Anat.), the elongated cells or elements of the sensory layer of the retina, some of which are cylindrical, others somewhat conical.

A chain of sheet metal links with an elongated hole through each broad end, made up by doubling the first link on itself, slipping the next link through and doubling, and so on.

hey have a sharklike form, but are more nearly allied to the rays. The flattened and much elongated snout has a row of stout toothlike structures inserted along each edge, forming a sawlike organ with which it mutilates or kills its prey.

numerous species of marine gastropods of the genus Scalaria, or family Scalaridæ, having elongated spiral turreted shells, with rounded whorls, usually crossed by ribs or varices. The color is generally white or pale. Called also ladder shell, and wentletrap. See Ptenoglossa, and Wentletrap.

An oblong or elongated seed vessel, consisting of two valves with a dissepiment between, and opening by sutures at either margin. The seeds are attached to both edges of the dissepiment, alternately upon each side of it.

A narrow, elongated cavity, in which pus is collected; an elongated abscess with only a small orifice.

ls and allied beetles. Snout beetle (Zoöl.), any one of many species of beetles having an elongated snout and belonging to the tribe Rhynchophora; a weevil. -- Snout moth (Zoöl.), any pyralid moth. See Pyralid.

Any elongated instrument or probe, usually metallic, by which cavities of the body are sounded or explored, especially the bladder for stone, or the urethra for a stricture.

A kind of flower cluster in which sessile flowers are arranged on an unbranched elongated axis. Spike grass (Bot.), either of two tall perennial American grasses (Uniola paniculata, and U. latifolia) having broad leaves and large flattened spikelets. -- Spike rush. (Bot.) See under Rush. -- Spike shell (Zoöl.), any p…

In certain Sporozoa, a small active, usually elongate, sickle- shaped or somewhat amoboid spore, esp. one of those produced by division of the passive spores into which the zygote divides. The sporozoites reproduce asexually.

Any marine gastropod shell of the genus Apporhais having an elongated siphon. See Illust. under Rostrifera.

line of dehiscence of the sporangium of a fern. It is usually marked by two transversely elongated cells. See Illust. of Sporangium.

maxillipeds are leglike in form, and the large claws are comblike. They have a large and elongated abdomen, which contains a part of the stomach and heart; the abdominal appendages are large, and bear the gills. Called also Gastrula, Stomatopoda, and Squilloidea.

ra in a state of development succeeding the scyphistoma. The body of the strobila becomes elongated, and subdivides transversely into a series of lobate segments which eventually become ephyræ, or young medusæ.

The elongated part of a pistil between the ovary and the stigma. See Illust. of Stamen, and of Pistil.

An order of small apterous insects having an elongated body, with three pairs of thoracic and about nine pairs of abdominal legs. They are, in many respects, intermediate between myriapods and true insects.

A suborder of lophobranch fishes which have an elongated snout and lack the ventral and first dorsal fins. The pipefishes and sea horses are examples. -- Syng"na*thous, a.

A downy or feathery appendage to certain achens. It is formed of the permanent elongated style.

A tapering form; gradual diminution of thickness in an elongated object; as, the taper of a spire.