The largest of these is about 33 mm. in length, and agrees well with the description of this species given by Thomson, the rostrum having 4 teeth, with a fairly wide interval between the second and third; the external maxillipeds are greatly developed. In the other specimens, most of which are considerably smaller, there appears to be considerable variation in the number of teeth on the rostrum: in one specimen 27 mm. long the rostrum bears 6 teeth, somewhat unequal in size and a little unequally spaced; in other specimens there are only 4, and the interval between the second and third varies in extent. Although none of the specimens are as large as those sometimes met with in New Zealand, I prefer to refer them to the same species. I am doubtful whether Alope australis Baker is really distinct from this species. According to Mr. McCulloch, A. australis is common near Sydney Harbour.