The fissure betwen the supraocular eave and the postocular cup disappears, but the mesocular spine remains, though very much reduced. A feature of the adult carapace is the four large, outwardly directed depressions, two placed where the hepatic, branchial and gastric regions unite, the others over the middle of each branchial region.

The male abdomen differs little from that of the juvenile, but the two lateral tubercles on the sixth segment have disappeared. The abdomen of the adult female is seven-jointed. It occupies the whole space between the legs, and reaches right to the base of the mouth field. On either side of the midline is a shallow longitudinal groove; the last segment is broadly triangular. The first pleopod of the male (Fig. 8) is slender, and apically divided into three (Fig. 8a); the inner portion projects beyond the end of the pleopod and is armed on its internal surface with short spinules; the median portion takes the form of a ventral lobe bearing long setae which seen from beneath are arranged in two rows, only the anterior row being visible from above; the outer, or sternal portion is bent inwards at its tip into a hook-like structure, the outer surface is provided with setae, the marginal ones being long and continued almost to the base of the pleopod. The second pleopod is short and composed of three distinct segments.