Atrypidæ (atripide)

pl. [NL., IMG:content-1345.png:[blocks in formation] 1. Dorsal valve, hinge-plate. 2. Ventral valve: a , impre ions of abductor muscles; c, cardinal muscle; 1, pedicle muscle; o, ovarian sinus; d , deltidium. brachiopods with the brachial appendages rigid and spirally coiled toward the center of the shell, and completely supported by spiral lamellæ, the valves generally subovate or trilobed, the foramen beneath a produced beak completed by a deltidium, and the shell-substance fibrous and impunctate. Atta (at'ä), n. [NL., IMG:content-1346.png:[blocks in formation] insects, of the suborder Heterogyna and family Formicida, or ants. They have very short palps, and the heads of the workers are thick. A. cephalotes is a West Indian species called the visiting ant, and A. fervens is the red ant of Texas.