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The main substance of the muscular wall of the heart inclosed between the epicardium and endocardium.

A large genus of tropical American trees and shrubs, nearly related to the true myrtles (Myrtus), from which they differ in having very few seeds in each berry.

A genus of leguminous trees of tropical America, the different species of which yield balsamic products, among which are balsam of Peru, and balsam of Tolu. The species were formerly referred to Myrospermum.

A tropical fruit. See Sapodilla. [Written also nisberry.]

sting genus of tetrabranchiate cephalopods. About four species are found living in the tropical Pacific, but many other species are found fossil. The shell is spiral, symmetrical, and chambered, or divided into several cavities by simple curved partitions, which are traversed and connected together by a continuous and…

specially, one of a race of black or very dark persons who inhabit the greater part of tropical Africa, and are distinguished by crisped or curly hair, flat noses, and thick protruding lips; also, any black person of unmixed African blood, wherever found.

d smooth shell, and a yellowish or bluish color. The seeds grow in the prickly pods of tropical, woody climbers of the genus Cæsalpinia. C. Bonduc has yellowish seeds; C.Bonducella, bluish gray. [Spelt also neckar nut, nickar nut.]

A typical, structural unit; a type. Agassiz.

Standard; original; exact; typical. Specifically:

ng a hard bony achene. Several species are found in the United States and many more in tropical regions. -- Nut tree, a tree that bears nuts. -- Nut weevil (Zoöl.), any species of weevils of the genus Balaninus and other allied genera, which in the larval state live in nuts.

A genus of tropical corals, usually branched, and having a very volid texture.

A genus of polished marine gastropod shells, chiefly tropical, and often beautifully colored.

A genus of tropical orchidaceous plants, the flower of one species of which (O. Papilio) resembles a butterfly.

The typical genus of ophidioid fishes. [Written also Ophidium.] See Illust. under Ophidioid.

re gathered and highly esteemed as food by the natives. An allied species inhabits the tropical Atlantic and swarms in June or July.

Mean; vile; worthless; despicable; contemptible; pitiful; trifling; as, a paltry excuse; paltry gold. Cowper. The paltry prize is hardly worth the cost. Byron.

like trypsin, present in the juice of the green fruit of the papaw (Carica Papaya) of tropical America.

A tree (Carica Papaya) of tropical America, belonging to the order Passifloreæ. It has a soft, spongy stem, eighteen or twenty feet high, crowned with a tuft of large, long-stalked, palmately lobed leaves. The milky juice of the plant is said to have the property of making meat tender. Also, its dull orange-colored, me…

The typical butterflies.

An annual asteraceous herb (Spilances oleracea) grown in tropical countries as a pungent salad, and also used medicinally.