3° 



less than twice, as long as broad. Fourth pair of male pleopods 



with both rami terminating in very modified setae 10. 



9. Male pseudobranchial rami on second to fourth pairs of pleopods 

 not twisted but nearly straight. Distal joint of the exopod of 

 the uropods more than half as long as the proximal joint and 

 considerably more than twice as long as broad. Fourth pair of 

 male pleopods with the exopod normal, the endopod a little or 



somewhat elongated with the terminal setae modified 13. 



10. Antenna! squama with some spines along the outer margin . . S. serrata n. sp. 



10. Antennal squama without spines (the terminal denticle not included) 



along the outer margin 11. 



1 1 . Both rami of fourjh pair of male pleopods with one of their two 

 feebly curved setae of the terminal joint extremely long and thick, 



more than twice as long as the other seta S. inornata n. sp. 



1 1 . Both rami of fourth pair of male pleopods with their two terminal 



setae of moderate length, considerably curved 12. 



12. Lateral branches of the two feathered setae on the end of the 



telson extremely thin, far from easily visible 5. media n. sp. 



12. Lateral branches of the two feathered setse on the end of the 



telson strong, very conspicuous 5. plumicauda n. sp. 



13. In the male the antennal squama with the terminal lobe extremely 

 elongated, so that the denticle is placed at the middle of the outer 

 margin ; the endopods of fourth and third pairs of pleopods with 



the terminal setse considerably modified S. anomala n. sp. 



13. In the male the antennal squama shaped as in the females, with 

 the terminal lobe much broader than long; only the endopods of 



fourth pair of pleopods with the terminal setae modified 14. 



14. The outer seta of the penultimate joint of the endopod of fourth 

 pair of male pleopods plumose, not thickened and not reaching 

 the end of the outer extremely long and very thick seta of the 



terminal joint 5. distingitenda n. sp. 



14. The outer seta of the penultimate joint of the endopod of fourth 

 pair of male pleopods naked, thickened and considerably over- 

 reaching the end of the outer very moderately long seta of the 

 terminal joint S. conformalis n. sp. 



These 1 5 Asiatic species may be divided into four natural groups. 



Group 1 . End of telson with three small spines at the middle and a single pair or two 

 pairs of more lateral, long spines. Proximal joint of the endopod of the uropods with less than 

 half of its outer margin furnished with spines, and at least almost twice as long as the distal 

 joint, which is at most scarcely twice and generally considerably less than twice as long as broad. 



