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ontornithes. They had teeth, and were essentially carnivorous swimming ostriches. Several species are known. See Illust. in Append.

different forms at different stages of existence, or in different individuals of the same species; -- applied especially to insects in which there is a wide difference of form between the larva and the adult, and to plants having more than one form of flower.

A free-swimming, dimorphic, sexual form of certain species of Nereis.

An order of pelagic Gastropoda, having the foot developed into a median fin. Some of the species are naked; others, as Carinaria and Atlanta, have thin glassy shells.

r spondees, the fifth must regularly be a dactyl, and the sixth always a spondee. In this species of verse are composed the Iliad of Homer and the Æneid of Virgil. In English hexameters accent takes the place of quantity. Leaped like the | roe when he | hears in the | woodland the | voice of the | huntsman. Longfellow.…

A genus of plants (herbs, shrubs, or trees), some species of which have large, showy flowers. Some species are cultivated in India for their fiber, which is used as a substitute for hemp. See Althea, Hollyhock, and Manoe.

An American tree of the genus Carya, of which there are several species. The shagbark is the C. alba, and has a very rough bark; it affords the hickory nut of the markets. The pignut, or brown hickory, is the C. glabra. The swamp hickory is C. amara, having a nut whose shell is very thin and the kernel bitter. Hickory…

ca, which makes mounds or ant-hills over its nests. -- Hill myna (Zoöl.), one of several species of birds of India, of the genus Gracula, and allied to the starlings. They are easily taught to speak many words. [Written also hill mynah.] See Myna. -- Hill partridge (Zoöl.), a partridge of the genus Aborophila, of whi…

A genus of lophobranch fishes of several species in which the head and neck have some resemblance to those of a horse; -- called also sea horse.

supposed to be the behemoth of the Bible. Called also zeekoe, and river horse. A smaller species (H. Liberiencis) inhabits Western Africa.

A fossil bivalve mollusk of the genus Hippurites, of many species, having a conical, cup-shaped under valve, with a flattish upper valve or lid. Hippurites are found only in the Cretaceous rocks.

A tree or shrub of the genus Ilex. The European species (Ilex Aguifolium) is best known, having glossy green leaves, with a spiny, waved edge, and bearing berries that turn red or yellow about Michaelmas.

A species of Althæa (A. rosea), bearing flowers of various colors; -- called also rose mallow.

An order of elasmobranch fishes, including, among living species, only the chimæras; -- called also Holocephala. See Chimæra; also Illustration in Appendix.

The possession, in one species of plants, of only one kind of flowers; -- opposed to heteromorphism, dimorphism, and trimorphism.

One of several species of flowering plants, much admired for their beauty, and some for their fragrance.

r depress at pleasure. Called also hoop, whoop. The name is also applied to several other species of the same genus and allied genera.

f the dog-rose. See Hip. Hop back. (Brewing) See under 1st Back. -- Hop clover (Bot.), a species of yellow clover having heads like hops in miniature (Trifolium agrarium, and T. procumbens). -- Hop flea (Zoöl.), a small flea beetle (Haltica concinna), very injurious to hops. -- Hop fly (Zoöl.), an aphid (Phorodon hu…

ehound, a disagreeable plant resembling horehound (Ballota nigra). -- Water horehound, a species of the genus Lycopus, resembling mint, but not aromatic.

Any bird of the family Bucerotidæ, of which about sixty species are known, belonging to numerous genera. They inhabit the tropical parts of Asia, Africa, and the East Indies, and are remarkable for having a more or less horn-like protuberance, which is usually large and hollow and is situated on the upper side of the b…