133 



2nd pair of legs are shorter than those behind them and hardly reach the tip of 

 the antennal scale. 



In an egg-laden female the carapace (rostrum included) is 30 millim., the 

 abdomen 41 millim. long, measured in the middle line. 



Found only in the Andaman Sea, at 370-419, 405, 490, and 500 fathoms. 



This species very closely resembles G. hastacauda, but can be at once dis- 

 tinguished (1) by the fact that the anterior part of the 3rd or dorso-lateral crest 

 of the carapace ends behind the orbital spine instead of being continuous with 

 it, and (2) by the elongate-oval antennal scale. 



Regd. Nos. 55 (Type of the species) : 139 ^ ) 14 . . 1 : 5!! . 2514-2515 



Subgenus Plastocrangon, nov. 

 Differs from Glyphocrangon only in the following particulars :— 

 The eyes are small and in life are of an opaque yellow-ochre colour, in spirit 

 they are of the same neutral tint as the carapace. The dorsal and subdorsal 

 crests of the carapace are broken up into lines of tubercles. The branchiae are 

 only 9 on either side, arthrobranchiaa being absent from the Xth and Xlth 

 somites: otherwise the branchial formula is as in Glyphocrangon. 



I. 



Synopsis of the Indian species of the subgenus Plastocrangon. 



The anterior half of the 4th or " lateral " crest of the carapace ends in a 

 huge vertically-compressed wing-like spine, lying behind and external 

 to the branehiostegal spine, and projecting far beyond the anterior 

 border of the carapace : — 



The anterior half of the 4th or " lateral " crest of the carapace 

 has no spine but the large spine aforesaid : posterior half of 

 3rd or " doi so-lateral " crest entire 



I. 



•2. 



II. 



The anterior half of the 4th or "lateral " crest of the carapace 

 is cut into two portions, the anterior of which is the large 

 spine aforesaid : posterior half of 3rd or - dorso-lateral " crest 

 cut into two lobes 



The anterior half of the 4th or " lateral " crest of the carapace is cut into 

 two small teeth, the anterior of which falls far short of the anterior 

 border of the carapace. Abdominal terga and plenra crisply sculp- 

 tured 



P. caeca. 



P- cerea. 



P. csecescens. 



80. 



Glyphocrangon {Plastocrangon) cmcescens, Wood-Mason. 



Qlyphocranqon csecescens, Wood-Masou. Ann. Maf;. Nat. Hist., Nov. 1801, p 35" 

 ItXTOTRATIONS OF THE ZOOLOGY OF THE INVESTIGATOR, CRUSTACEA, Plate VII. Fl(; 5 



The rostrum, the length of the free portion of which is nearly equal to that 

 of the rest of the carapace measured in the middlo line, is traversed dorsally by 



