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Genus Harmonia, Haswell.
(Proc. Linn. Soc. N.S.W., vol. iv., p. 330, and Cat. Aust. Crust., p. 250.)
Generic characters:—“Coxæ not so deep as their respective segments. Superior antennæ with an appendage. Inferior antennæ longer than the superior pair. Mandibles with a palp. Maxillipedes unguiculate, subpediform, provided with a squamiform plate on the basos only. Gnathopoda subchelate, unequal, posterior pair very large. Pereiopoda stout. Posterior pleopoda biramous, the rami short, conical. Telson single, elongate.”
Of this genus Mr. Haswell says: “This genus, of which I have as yet observed but one species, has affinities with Eurystheus and Amathia, but is distinguished from the former by the form of the telson and the stoutness of the pereiopoda, and from the latter mainly by the large size of the posterior gnathopoda.”
Before noticing Mr. Haswell's genus I had found the following species, and had begun to describe it as a new species of Eurystheus.
Harmonia crassipes, Haswell. (l.c., p. 330, pl. xix., fig. 3.)
“Superior antennæ as long as the cephalon and first six segments of the pereion, first and second segments of the peduncle subequal, the second narrower than the first, third scarcely distinguishable from the articuli of the flagellum; flagellum rather longer than the peduncle. Inferior antennæ longer than the superior pair; peduncle and flagellum subequal. Anterior gnathopoda small; propodos ovoid; palm oblique, undefined. Posterior gnathopoda much larger than the anterior pair; carpus sub-
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triangular; propodos irregularly ovoid, palm oblique, excavate, defined by a triangular tooth, and armed with another of similar form near the distal end. Two anterior pairs of pereiopoda subequal; three posterior pairs with the basa oblong twice as long as broad, the other joints very broad, the dactylos very stout; fourth pair smaller than the fifth and sixth. Rami of fourth pair of pleopoda as long as the protopodite; those of the fifth pair shorter; those of sixth pair very short, conical, armed with a few straight setæ. Telson simple, conical, compressed. Colour brown. Length, 3/20 inch.”
Hab. Lyttelton Harbour; Timaru.
This species is moderately common at Lyttelton Harbour; Mr. Haswell's specimens are from Port Jackson. The female differs from the male in the form of the second gnathopoda. The first gnathopoda are like those of male, and are shown in pl. II., fig. 5 a. They are very hairy, and at the inferior edge of the palm are two stout setæ. The second gnathopoda of female are much smaller than those of the male, the carpus is subtriangular and larger than the carpus in the second gnathopoda of male, it has its distal and inferior borders setose; propodos only slightly broader than the carpus, long ovate, with small tufts of setæ on the two sides and on the middle, palm oblique imperfectly defined by a stout seta on each side at the end of the dactylos.