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Order Amphipoda.
Leucothoe traillii G. M. Thomson.
Leucothoe traillii G. M. Thomson, Trans. N.Z. Inst., vol. 14, p. 234, pl. 18, fig. 1 a-d, 1882; Stebbing, Das Tierreich Amphip., p. 164, 1906. L. tridens, Stebbing, Rep. Voy. “Challenger,” vol. 29, p. 777, pl. 47, 1888; Chilton, Trans. N.Z. Inst., vol. 38, p. 268, 1905; Stebbing, Das Tierreich Amphip., p. 166, 1906.
I have no doubt these two species should be combined. I had identified specimens from Hauraki Gulf as L. tridens Stebbing, but I find that they are the same as a Lyttelton specimen that I had years ago referred to L. traillii G. M. Thomson, and I find from comparison of these with named specimens of this species since received from Mr. Thomson that no difference can be detected between them. Mr. Thomson describes the dactyl of the first gnathopod as being “finely serrated on its inner margin,” but in all my specimens it appears quite smooth. In Mr. Thomson's mounted specimen the dactyl lies close up against the propod,
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and its inner margin cannot be clearly seen, but it appears smooth there also. In his original description Stebbing describes the telson as having “the minute apex microscopically tridentate,” and figures it as distinctly tridentate; in the “Das Tierreich” description he simply says, “apex a little obtuse,” which perhaps more accurately describes the appearance of the telson in those specimens that I have examined.
Hab.—Hauráki Gulf (25 fathoms), Paterson Inlet (10 fathoms). Taken also in New Zealand seas by the “Challenger” (2,000 fathoms).