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That group of vertebrates which develops in its embryonic life the envelope called the amnion. It comprises the reptiles, the birds, and the mammals.

tebrates, having neither brain, skull, vertebræ, nor red blood. It forms the type of the group Acrania, Leptocardia, etc.

A numerous group of fourteen -- footed Crustacea, inhabiting both fresh and salt water. The body is usually compressed laterally, and the anterior pairs or legs are directed downward and forward, but the posterior legs are usually turned upward and backward. The beach flea is an example. See Tetradecapoda and Arthrostr…

or occupy in a pleasant manner; to stir with pleasing or mirthful emotions; to divert. A group children amusing themselves with pushing stones from the top [of the cliff], and watching as they plunged into the lake. Gilpin.

One of a group of metameric hydrocarbons, C5H10, of the ethylene series. The colorless, volatile, mobile liquid commonly called amylene is a mixture of different members of the group.

One of the starch group (C6H10O5)n of the carbohydrates; as, starch, arabin, dextrin, cellulose, etc.

A group of teleostean fishes destitute of spiny fin-rays, as the cod.

An organ which is equivalent in its functions to a different organ in another species or group, or even in the same group; as, the gill of a fish is the analogue of a lung in a quadruped, although the two are not of like structural relations.

lytical table (Nat. Hist.), a table in which the characteristics of the species or other groups are arranged so as to facilitate the determination of their names.

Any inflammatory affection of the throat or faces, as the quinsy, malignant sore throat, croup, etc., especially such as tends to produce suffocation, choking, or shortness of breath. Angina pectoris, a peculiarly painful disease, so named from a sense of suffocating contraction or tightening of the lower part of the c…

r these there are Classes, Orders, Families, Genera, Species, and sometimes intermediate groupings, all in regular subordination, but variously arranged by different writers.

A group of herbivorous mammals characterized by having the hoofs in a single series around the foot, as the elephant, rhinoceros, etc.

A division of the Articulata, including the annelids and allied groups; sometimes made to include also the helminths and echinoderms. [Written also Annuloidea.]

One of a group of perching birds, having the middle toe more or less united to the outer and inner ones.

A group of decapod Crustacea, of which the hermit crab in an example.

A group of insects which includes the lice.

One of a group of ruminant quadrupeds, intermediate between the deer and the goat. The horns are usually annulated, or ringed. There are many species in Africa and Asia. The antelope and wolf both fierce and fell. Spenser.

A mineral of the hornblende group, of a yellowish gray or clove brown color. -- An`tho*phyl*lit"ic, a.

lass of the Coelenterata which includes the corals and sea anemones. The three principal groups or orders are Acyonaria, Actinaria, and Madreporaria.

The group that includes man only.