201 



In the female the 1st pair of abdominal appendages are very fine uniramous 

 filaments, the 2nd pair are almost as slender but are biramous, and the 3rd-5th 

 pairs are foliaceous and biramous with a small internal appendix. 



In an egg-laden female the carapace is 3 millim. long, measured in the 

 middle line, and the abdomen 9'5 millim. The eggs are large. 



Andaman Sea 185 and 244 fathoms. One specimen was extracted from 

 a water-logged mangrove twig dredged from the bottom. 



Regd. No. ^? (Type of the species) : 5 f 4 . 



Gebicuxa n. gen. 



Differs from Gebia in having the lat pair of thoracic legs simple and the last pair almost perfectly chelate : 

 the telson is much shorter than the caudal swimmereta. 



Carapace shorter than the abdomen, the posterior border very concave, the 

 Uneae thalassinicas and cervical suture very distinct. Rostrum broadly triangular. 



The abdominal terga, which are very unequal in length and breadth, do not 

 overlap one another: the pleura are rudimentary: the telson is short and 

 quadrate, the caudal swimmerets broadly foliaceous, the exopodite being without 

 a diagonal suture. 



Eyestalks short, almost hidden beneath the rostrum. The antennular 

 flagella, which are two in number, are short. No antennal scale, the antennal 

 flagellum as long as the body. 



The 2nd and 3rd maxillipeds are strictly pediform: both have slender 

 exopodites but no epipodites. There are no epipodites on any of the thoracic 

 appendages. 



The 1st pair of thoracic legs, which are equal and symmetrical, are longer 

 and much stouter than any of the others : they must be described as strictly 

 mouodactylous, for though the dactylus can be flexed at right angles with the 

 propodite, yet when so flexed it stands quite clear of the propodite and its tip 

 does not impinge against anything. The 2nd-4th pairs of legs are monodactyl- 

 ous, but the 5th pair are almost perfect ckeke. 



The abdominal appendages of the 1st somite are slender and uniramous : 

 those of the 2nd-5th somites are biramous, with the exopodite long lamellar and 

 setose, and the endopodite short and styliform. 



The gills are small arthrobranchia?, arranged in pairs on somites IX to 

 XIII as in Ctillianassa, and the gill-elements are disposed in two rows one on 

 either side of a central stem, like phyllobranchiae. 



The single species at present known belongs to the Andaman oligobenthos. 

 26 



