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Eurythenes gryllus (Licht.).
Gammarus gryllus (H. Lichtenstein) in Mandt., Observ. Groenl., p. 34, 1822.
Euryporeia gryllus Chevreux, Résultats Campagnes Sci. Albert 1er de
Monaco, fasc. 16, p. 24, pl. 14, fig. 4. Eurythenes gryllus Stebbing, Das Tierreich Amphip., p. 73, 1906.
I have one imperfect specimen from Sunday Island which from its size and other characters certainly belongs to this species. The body is 35 mm. in length, and the shape of the different segments and of the side plates and the dorsal depression on pleon segments 3 and 4 agrees well with
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that given for this species. The dorsal carina is well marked; it is pretty distinct on segments 4–7 of the peraeon and 1–4 of the pleon, and there is some indication even on the third segment of the peraeon. The specimen was evidently much decayed before it was collected, and nearly all the appendages are wanting; the greater part, however, of the second gnathopods is still present, and agrees well with the description given by other authors. The same is also true of the mouth parts, so far as I have been able to examine them.
The species is well known in northern seas, and has also been taken in various places in the Atlantic and near Cape Horn. Its occurrence at the Kermadecs is interesting, and shows that it probably distributed widely in southern seas.
It is celebrated as being one of the largest of the Amphipoda, the length sometimes being as much as 90 mm.