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A genus of venomous ticks which attack men and animals. The famous Persian Argas, also called Miana bug, is A. Persicus; that of Central America, called talaje by the natives, is A. Talaje.

rolicus Pennantii) with silvery scales. The name is also applied to various fishes of the genus Argentina.

A cephalopod of the genus Argonauta.

A genus of Cephalopoda. The shell is called paper nautilus or paper sailor.

A genus of copepod Crustacea, parasitic of fishes; a fish louse. See Branchiura.

A genus of East Indian pheasants. The common species (A. giganteus) is remarkable for the great length and beauty of the wing and tail feathers of the male. The species A. Grayi inhabits Borneo.

A marine bivalve shell belonging to the genus Arca and its allies.

A genus of small isopod Crustacea that can roll themselves into a ball.

A genus of plants; also, the most important species (Arnica montana), native of the mountains of Europe, used in medicine as a narcotic and stimulant.

An aquatic plant of the genus Sagittaria, esp. S. sagittifolia, -- named from the shape of the leaves.

A west Indian plant of the genus Maranta, esp. M. arundinacea, now cultivated in many hot countries. It said that the Indians used the roots to neutralize the venom in wounds made by poisoned arrows.

A peculiar transparent worm of the genus Sagitta, living at the surface of the sea. See Sagitta.

A genus of phyllopod Crustacea found in salt lakes and brines; the brine shrimp. See Brine shrimp.

A genus of plants including the plants called mugwort, southernwood, and wormwood. Of these A. absinthium, or common wormwood, is well known, and A. tridentata is the sage brush of the Rocky Mountain region.

Of or pertaining to the breadfruit, or to the genus Artocarpus.

A genus of plants found in central Europe and about the Mediterranean, having flowers on a spadix inclosed in a spathe. The cuckoopint of the English is an example. Our common arums the lords and ladies of village children. Lubbock.

A mouse of the genus Arvicola; the meadow mouse. There are many species.

A genus of trilobites found in the Lower Silurian formation. See Illust. in Append.

A genus of simple ascidians, which formerly included most of the known species. It is sometimes used as a name for the Ascidioidea, or for all the Tunicata.

A genus of plants including the milkweed, swallowwort, and some other species having medicinal properties. Asclepias butterfly (Zoöl.), a large, handsome, red and black butterfly (Danais Archippus), found in both hemispheres. It feeds on plants of the genus Asclepias.