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Same as Keratosa.

A suborder of primates, including the lemurs, the aye-aye, and allied species. [Written also Lemuroida.]

An order of Merostomata, including among living animals the genus Limulus, with various allied fossil genera, mostly of the Carboniferous period. Called also Xiphosura.

A division of Invertebrata which includes the classes Brachiopoda and Bryozoa; -- called also Anthoid Mollusca.

An order of worms, having a long, round, and generally smooth body; the roundworms. they are mostly parasites. Called also Nematodea, and Nematoda.

Nematoid.

A division of vermiform gastropod mollusks, without a shell, belonging to the Isopleura.

h are not grooved beneath and are often very fragile; -- called also Ophiuroida and Ophiuridea. See Illust. under Brittle star.

Orchidaceous.

An order of Entomostraca possessing hard bivalve shells. They are of small size, and swim freely about. [Written also Ostracoda.]

more than twenty vertical rows of plates. Called also Palæechini. [Written also Palæechinoidea.]

A suborder of Crinoidea found chiefly in the Paleozoic rocks.

Same as Perciformes.

A division of Arachnoidea, including the daddy longlegs or harvestman (Phalangium) and many similar kinds. They have long, slender, many-jointed legs; usually a rounded, segmented abdomen; and chelate jaws. They breathe by tracheæ. Called also Phalangides, Phalangidea, Phalangiida, and Opilionea.

A division of Gregarinæ including those that have two or more internal divisions of the body.

An order of large mammal

Proboscidian.

l gills and four legs. It includes Proteus and Menobranchus (Necturus). Called also Proteoidea, and Proteida.

Having the posterior side of the tarsus covered with small irregular scales; -- said of certain birds.

A small mound of earth; ground slightly elevated; a small ridge.