Description of Female.

Length 3 mm.; depth ¾ mm.; width ⅔ mm. Like male except.

Antennae. Length about 1 mm., subequal. Fourth peduncle segment of second antennae lacking lobe.

Gnathopods. First: Much like male. Second: Sideplate width ¾ depth, comparatively short setae on ventral margin. Basos not widening much distally, width barely mote than ¼ length, about 3 very long plumose setae posterodistally. Merus and carpus as in male but differing slightly in proportions; merus greatest width ⅓ length, scattered fine short setae on posterior margin; carpus as long, width ⅓ length. Propod barely shorter than carpus, narrowing slightly distally, width ¼ length; margins straight, several long and short setae on anterior, long fine setae on distal angles; palm very small, ill-defined. Dactylos with 1 or 2 setae; less than ⅓ propod length.

Localities. Brighton, Otago, coll. G. M. Thomson; Napier; Nelson.

Topotypes. Slides C.51, male; C.52, female; Brighton.

Distribution. New Zealand; Brisbane River, Australia, in brackish water.

Remarks. All definitely established localities for this species are brackish water; like many species of Corophium (cf. footnote, Chilton, 1920a: 2) it would appear to be a brackish water species.

Paracorophium lucasi n.sp. (Figs. 84–99.)

Paracorophium excavatum (partim) Chilton, 1920a: 1–8, fig. 2b, 3, 4, 5, 6, 7, 10b, 13a, 17, 17a, 18, 19.