210 .Mr. ]j. A. Borr.ulailo — yofcs on Gdridea. 



12. ^'Ki/eon ru<^fiiio.<tnn. 



Related to A. medium (Ale. it And.), ISO'J, but lias (1) the 

 heatliiiijf of tlie ridges of the carapace much coarser, (2) no 

 tooth on either side of base of rostrum, (3) the large spine 

 near the pteryj^ostomial angle placed at the end of the supra- 

 niarjTinal, not lateral, ridge. 



Westerji Indian Ocean. 



13. UrocarideUa gracUh. 



Rostrum j^j^„ nearly twice as long as carapace. Antenna! 

 and hejiatic spines present. Anfennular stalk three-quarters 

 length of antc-nnal scale. Latter not half length of rostrum, 

 subtruncate, its distal spine not projecting. First leg out- 

 reaching antennal scale by tingers. Second legs equal and 

 similar, unarmed, outreaching antennal scale by band and 

 part of \vi ist. 



Maldive Is. 



l-l. Pahemonella elegans. 



Related to P. tridentata, Borr., 1809, but with rostrum 

 lanceolate, not reaching end of first juint uf antennai, its 

 formula ^, 



Salomon I. 



15. Pahnmonella longirostris. 



Rostrum ^, outreaching antennular stalk by nearly half its 

 own length, upcurved. First wrist half as long again as 

 its hand. Arm of second leg of even width throughout. 



FardifTolu Atoll, Maldive Is. 



IQ. PericUmenes {Cristiger) frater. 



Related to P. soror, Nobili, 1904, but (1) teeth on upper 

 edge of rostrum closer set towards tip, (2) two distal spines 

 on first joint of antennule, (3) antennal scale decidedly out- 

 reaches first leg, (4) no accessory denticle on dactylopodites 

 of last three legs. 



Seychelles. 



17. PericUmenes {Cristiger) incerlus. 



Related to P. //arvus, Borr., 1898, but (1) body more 

 slender, (2) rostrum shallower, (3) a denticle on carapace 

 behind beginning of rostral crest, (4) penultimate joint of 

 third maxilliped longer than end-joint. 



AJaldive Is. 



