IN a paper which was read at the Royal Society this year, I described the anatomy of a female amphipod caught in the Atlantic, and remarkable for its large size and the absence of the second pair of antennæ. This female had a length of 84 mm., not of 14 mm., as has been stated in NATURE and in other periodicals which have reprinted my abstract from the Proc. Roy. Soc. We have since also caught males of this interesting amphipod, which were still larger, more than 3 in. long. A description of these has been added to the above-mentioned paper, so that now the anatomy of both sexes will be known. This amphipod, which, as we have discovered, lives on the surface, is, thus, by far the largest one known. Some figures represeniing the male and parts of the mouth, which at first could not be dissected, and therefore not well be seen, will appear in a larger paper on some of the remarkable deep-sea and other Crustacea caught during the Challenger's cruise in the Atlantic.