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Ko. X.— PENJ3IDEA, STENOPIDEA, AND REPTANTIA 

 EROM THE WESTERN INDIAN OCEAN. 



By L. A. BoKRADAiLE, M.A., Lecturer in Natural Sciences at 

 Selioyn College, Cambridge. 



{Cummunicafed bij J. Stanley Gardiner, M.A., F.R.S., F.L.S.) 



(Plate 16.) 



Read 17th June, 1909. 



The Crustaceans enumerated in the following systematic list were collected by 

 Mr. Stanley Gardiner's two expeditions to the Islands and Banks of the Western 

 Indian Ocean. Together the collections contained twenty-two species, of which eight, 

 or perhaps nine, are new, one being the type of a new genus. All tiie species which were 

 already known have previously been recorded from some part of the Indian Ocean or 

 neighbouring waters, but Sicyonia carinata is interesting as having been taken also in 

 the Western Atlantic. 



DECAPODA NATANTIA. 



PEN^IDEA. 



Family Peiiseidas. 

 Subfamily Penseinee. 



Genus METAPEN^US, W.-Mason, 1891. 



1. MetajjencBUs moffiensis (PL.ath.), 1903. 



Parapenceus mogiensis, Rathbun, Proc. U.S. Nat. Mus. xxvi. p. 39. 

 Metopen<eiis mogiensis, Alcockj Cat. liid. Deo. Crust, iii. i. p. 29, pi. 5. fig. 15. 



The antennular flagella in most of the specimens are rather longer and more tapering 

 than in Alcock's figure, and the rostrum curves slightly upwards, more as in Miss 

 llathbun's figure than as in Alcock's. Tlie relative width of the two halves of the 

 petasma varies and the right half is sometimes rather larger than the left. 



Many specimens taken in depths down to 34 fathoms throughout the Maldives and in 

 the Seychelles and Cargados Carajos. 



2. Metapenceus stridulans, Ale, 1905. 



Ann. Mag. Nat. Hist. (7) xvi. p. 526; Cat. Ind. Dec. Crust, iii, i. p. 27, pi. 4.. fig. 14. 

 Taken in various localities in the Maldives. 



