figure which Mr. Haswell gives much resembles Ischyrocerus (Podocerus) anguipes Kröyer. Mr. Chilton supposes that the description given of the pleopoda [uropoda] is the result of an oversight, and that the genus must be cancelled in favour of Podocerus. It must, however, be observed that Mr. Haswell's description of the maxillipeds is quite inconsistent with this conclusion.” In Das Tierreich Stebbing (1906, p. 648) retains the genus Wyvillea Haswell, describing the maxillipeds as “exunguiculate, inner and outer plates rudimentary, palp three-jointed,” and to this genus he ascribes two species—viz., W. longimana Haswell and W. haswelli (G. M. Thomson). This description of the maxillipeds must, I think, be based on Haswell's original description, which was apparently incorrect. In the specimens from Lyttelton, which I feel sure are rightly referred to Haswell's species,^* the maxillipeds are normal and closely resemble the figure given by Sars for Ischyrocerus anguipes. I have also been able to compare my specimens with an Arctic one from Davis Strait sent to me by Dr. W. T. Calman, and have no hesitation in identifying them both as belonging to the one species. I have already pointed out (1920, p. 6) that the other species, Wyvillea haswelli (G. M. Thomson), is a species of Eurystheus. In this the maxillipeds are also normal. Consequently the genus Wyvillea must be finally dropped.

The Lyttelton specimens are all rather small, the largest about 6 mm. long; but those examined by Kirk were very much larger, the second gnathopod (now in my collection) of one specimen being itself 5 mm. long. Stebbing gives the length as varying from 4 mm. to 15 mm. The Davis Strait specimen that I have examined is about 12 mm. in length.

The differences between the male and female, as pointed out by me in 1884 from New Zealand specimens, closely agree with those described and figured by Sars in 1894. The special characters of the second gnathopod of the male are only acquired when the animal is fully adult, the immature stages being at first similar to those of the female. I have one immature male specimen in which the gnathopod closely resembles the figure given by Sars of Ischyrocerus minutus Lilljeborg; a species which Stebbing considers a synonym of I. anguipes Kröyer.

Ischyrocerus anguipes has been recorded from South Africa by Barnard, and is another example of an amphipod first described from northern seas which proves to be also widely distributed in the Southern Hemisphere.