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One of a group of hymenopterous insects whose larvæ feed parasitically upon living insects. See Ichneumon,

he subclasses of Crustacea, including a large number of species, many of them minute. The group embraces several orders; as the Phyllopoda, Ostracoda, Copepoda, and Pectostraca. See Copepoda, Phyllopoda, and Cladocera.

A group of Bryozoa in which the anus is within the circle of tentacles. See Pedicellina.

A group of worms, including the tapeworms, flukes, roundworms, etc., most of which live parasitically in the interior of other animals; the Helminthes.

table decoration, usually consisting of several dishes or receptacles of different sizes grouped together in an ornamental design.

t of ephemeral, but of eternal, efficacy. Sir J. Stephen. Ephemeral fly (Zoöl.), one of a group of neuropterous insects, belonging to the genus Ephemera and many allied genera, which live in the adult or winged state only for a short time. The larvæ are aquatic; -- called also day fly and May fly.

One of the artificial group of invertebrates of various kinds, which live parasitically upon the exterior of other animals; an ectozoön. Among them are the lice, ticks, many acari, the lerneans, or fish lice, and other crustaceans.

A group of chætopod annelids, including those that are not confined to tubes. See Chætopoda. [Written also Errantes.]

A group which includes the typical copepods and the lerneans.

A group which includes the bony ganoids, as the gar pikes.

A group which includes the typical Isopoda.

A metallic element of the rare-earth group, discovered spectroscopically by Demarcay in 1896. Symbol, Eu; at. wt., 152.0.

The general aspect or habit of a species, or group of species, esp. with reference to its adaptation to its environment.

Groups of small shining spots on the surface of the sun which are brighter than the other parts of the photosphere. They are generally seen in the neighborhood of the dark spots, and are supposed to be elevated portions of the photosphere. Newcomb.

One of a group of Australian birds of the genus Falcunculus, resembling shrikes and titmice.

The group comprising a husband and wife and their dependent children, constituting a fundamental unit in the organization of society. The welfare of the family underlies the welfare of society. H. Spencer.

Grouped in a fascicle; fascicled.

ons and their derivatives; the marsh gas or methane series. -- Natural fats (Chem.), the group of oily substances of natural occurrence, as butter, lard, tallow, etc., as distinguished from certain fatlike substance of artificial production, as paraffin. Most natural fats are essentially mixtures of triglycerides of f…

A group of spores arranged without order and covered with a thin gelatinous envelope, as in certain delicate red algæ.

A black, greenish, or brownish mineral of the chrysolite group. It is a silicate of iron.