1882.] ON CRUSTACEANS FROM MAURITIUS. 339 



at the end of the cell of the primaries, and passing in a how 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. L^pperside of Aijrias sfuarfi ^. 

 2. Underside oi Aqrias siuarti (^. 

 'A. Upperside of Agriiis heatifica 2 . 

 4. VwAer^iAe oi Agrias heatifica j. 



6. On some Crustaceans coUectetl at the Mauritius. 

 By Edward J. Mieks, 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. Robil- 

 lard, and recently forwarded hy 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 Coeno- 

 hita ferlata, M.-Edwards : although having the inferior surface 

 of the 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' (pi. xhv. 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, hoth unfor- 

 tunately imperfect, were sent two years ago to the British Museum 

 by the same collector, and which I propose to designate CaUianassa 

 maurifiana. 



Naxia (Naxioides) robillardi, sp. n. (Plate XX. fig. 1.) 

 The carapace is subpyriform, rather convex, and covered with 

 long stout conical spines ; of these spines about 13, situated on the 

 gastric region, are arranged in three somewhat irregular trans- 

 verse series, behind and in front of which are some smaller spines : 



