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Show 882,] ON CRUSTACEANS FROM MAURITIUS. 339 at the end of the cell of the primaries, and passing in a bow to the anal angle of the secondaries, beyond this towards the outer margin fading into grey, apices of primaries narrowly tipped with black : the underside resembles that of the male; but the colours are paler, and the base of the wings is of a tawny yellow instead of a reddish orange. EXPLANATION OF PLATE XIX. Fig. 1. Upperside of Agrias stuarti c$ • 2. Underside of Agrias stuarti 8 • 3. Upperside oi Agrias beatifica Q. 4. LTnderside of Agrias beatifica V. 6. On some Crustaceans collected at the Mauritius. By E D W A R D J. MIERS, F.L.S., F.Z.S. [Received March 15, 1882.] (Plate XX.) The Crustaceans which I have now the pleasure of bringing before the notice of the Society were obtained at the Mauritius by M . Robillard, and recently forwarded by him to the British Museum. They are:-(1) a fine Spider-crab, described below as Naxia robillardi, which was dredged at a depth of 30 fathoms [that such a large and interesting a species should have remained so long unnoticed is very remarkable; and I can only account for it on the supposition that this crab lives habitually at considerable depths, and hence has escaped the notice of collectors of the littoral forms, most of which are well known]. (2) an example of Neptunus sieboldi, A. M.-Edwards, a swimming crab hitherto a desideratum to the national collection ; and (3) several specimens of a Hermit Crab which I think is Cceno-bita perlata, M.-Edwards : although having the inferior surface of tbe joints of the first three legs very hairy, these specimens in all other particulars coincide with M.-Edwards's brief description in the 'Histoire naturelle des Crustaces' (ii. p. 242, 1837), and with the excellent figure in the large illustrated edition of Cuvier's ' Regne Animal' (pl. xliv. fig. 1). In order to complete the account of the Crustaceans received from the Mauritius through M . V. de Robillard, I have added a brief notice of a fossorial Crustacean of which two examples, both unfortunately imperfect, were sent two years ago to the British Museum by the same collector, and which I propose to designate Callianassa mauritiana. NAXIA (NAXIOIDES) ROBILLARDI, sp. n. (Plate XX. fig. 1.) The carapace is subpyriform, rather convex, and covered with lone stout conical spines ; of these spines about 13, situated on the trie region, are arranged in three somewhat irregular transverse series behind and in front of which are some smaller spines : |
