edriophthalma

Century Dictionary and Cyclopedia

1. The sessile-eyed crustaceans; one of the two great divisions of the higher (malacostracous as distinguished from entomostracous) Crustacea, having fixed sessile eyes not borne upon a movable stalk, as in the Podophthalma (which see), no solid carapace or cephalothorax, the head, thorax, and abdomen distinct, and the thorax segmented like the abdomen. This division, rated as a subclass, includes the three orders Læmodipoda, Amphipoda, and Isopoda (see these words), and in this acceptation the term is definite. It has, however, been used in less exact and more comprehensive senses, sometimes including even trilobites and rotifers.
2. In conchology, a tribe of gastropods having the eyes on the outer side of the base of the tentacles. It includes most of the proboscis-bearing forms.

GNU Webster's 1913

1. n. A group of Crustacea in which the eyes are without stalks; the Arthrostraca.