280 Messrs, J. Wood-Mason ayid A. Alcock on 



females and in the young of both sexes ends in a long stjli- 

 form process extending far beyond the peduncles of the 

 antennules, in the adult male is so shortened as to scarcely 

 pass beyond the end of the first joint of these appendages. 

 The only absolute difference which I have been able to detect 

 between our specimens and Duvernoy's figures and descrip- 

 tions is in the arrangement of the branchial pinnies above 

 described. 



Very many specimens of both sexes from Station 115, 188 

 to 220 fathoms. Several specimens had been previously 

 obtained in the same part of the Andaman Sea in 271 fathoms. 



Colour in life I'cd. 



14. Aristceus semidentatus (Sp. Bate). 



HemipetKsus semidentatus, Sp. Bate, ' Challenger ' Macvura, p. 805, 

 pi. xlix. fig. 1, 2 • 



Very many specimens of both sexes from Station 120, 240 

 to 276 fathoms. Previously obtained in lat. 20° 17' 30" N., 

 long. 80° 50' E., in 193 fathoms, and from the Swatch-of- 

 No-ground in 405 to 285 fathoms. 



This species presents precisely the same sexual characters 

 as the preceding, from which, so far as we have been at 

 present able to make out, it only differs in being quite 

 glabrous and as a rule smaller. 



15. Aristceus coruscans, sp. n. 

 Body elongate, slender, glabrous. Rostrum long, extend- 

 ing by nearly one half of its length beyond the peduncles of 



Fig. 6. 



Arhto'Ais eoruscans, $, f nat. size. 



