IX. A Monograph of the Recent British Ostracoda.

Abstract

-one pair only, of singular shape, forming an elongated, curved, flexible, annulated, vermiform appendage, which is spiniferous towards the apex. Upper antennae large, distinctly jointed, geniculate at the base. Mandibles proper obsolete. Second pair of jaws bearing a large branchial plate. Ej-es compound, pednnculated, widely separated; between the two in front a large simple eye and a short frontal tentacle.