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Genus Montaguana.
(Montagua, Spence Bate, Cat. Amphip. Crust. Brit. Mus., p. 54.)
As the name Montagua was long ago used by Fleming for a genus of Nudibranch Mollusca, I have altered the name of Mr. Spence Bate's genus to Montaguana.
Generic characters:—“The superior antennæ are as long as the inferior, and not furnished with a secondary appendage. The mandibles are not furnished with an appendage. The maxillipedes are pediform, unguiculate, and without, or with only rudimentary, squamiform plates. The first pair of gnathopoda are small, subchelate, the coxæ not developed into a squamiform plate. The second pair of gnathopoda are larger than the first, and have the coxæ very large, squamiform, deeper than the body, and produced anteriorly, so as to cover the organs of the mouth; the propodos is developed upon the same type as in the first pair. The pereiopoda are subequal; the coxæ of the two anterior pairs are very largely developed,
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deeper than the body, and produced posteriorly, so as to cover that of the following pair of pereiopoda. The posterior pair of pleopoda are styliform, unibranched, the ramus biarticulate. The telson is simple and squamiform.”
Montaguana miersii?
(? Montaguana miersii, Haswell, Proceedings Linn. Soc. N.S.W., vol. iv., p. 323, pl. XXIV., fig. 4, and Cat. Australian Crust., p. 226.)
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“Coxæ of the posterior gnathopoda and the two first pairs of pereiopoda much deeper than their respective segments. Superior and inferior antennæ subequal in length, equal in length to the cephalon and first three segments of the pereion; the peduncles stout, rather shorter than the flagella. Anterior gnathopoda small, the propodos subquadrate, the palm nearly transverse. Posterior gnathopoda with the propodos large, cordiform; the palm oblique, undefined. Pereiopoda subequal, rather stout. Colour yellow with brown markings. Length about 3/20 in.”
Hab. Timaru and Lyttelton Harbour.
Mr. Haswell obtained his specimens at Port Jackson. Mine differ from the description and figures given by him in some small points so that I am rather doubtful whether they are really the same species or not.
The first pair of gnathopoda has the palm more oblique than shown in Mr. Haswell's figure. In the second gnathopoda the specimens obtained at Timaru differ somewhat from those obtained at Lyttelton, though much too close in other respects to be considered as distinct species. The Lyttelton specimens are nearest to those described by Mr. Haswell. The palm, though it can hardly be called defined, yet has two stout setæ at the place where the end of the finger reaches to, one on each side; on the under-side of the propodos towards the base are a few rather long setæ, not shown in Mr. Haswell's figure; and in the centre of the palm is a small sharp projection. In the Timaru specimens the propodos is much stouter, palm less oblique, and without the small projection at its centre.
In the last three pairs of pleopoda my specimens closely resemble those of M. longicornis as figured by Mr. Haswell. In the figure of M. miersii the last pair of pleopoda are drawn with two rami, but this must, I suppose, be a slip of the artist's.