285 



are perfectly smooth except for some vesiculous granules on the ventral surface 

 of the ischium merus and carpus : in the male the palm is a little broadened and 

 inflated, and in both sexes there is an enlarged bicuspid tooth at the basal end 

 of the cutting edge of the dactylus. 



The legs are about half the length of the chelipeds: they have a few- 

 scattered silky seta? of enormous length ; their propodites are slightly expanded 

 in their distal half, where the posterior border is serrated ; their dactyli are 

 strongly serrated along the posterior border. 



The thoracic sternum has its edges deeply lobed in correspondence with the 

 segments of which it consists : the segment corresponding with the external 

 maxillipeds has a pair of median teeth, and that of the chelipeds has its anterior 

 angles strongly spiniform. 



Length of fully extended body of an adult male 30 millim., of chelipeds 70 

 millim. 



Arabian Sea, off Cape Comorin, 459 fathoms : Bay of Bengal, off Ceylon, 

 805;fathoms. 



^ j AT 9328 1356 1362 3759 3760 



Regd. Nos. — : — :_:_:—. 



52. UrOptycllllS bacillimanus, Alcock & Anderson. 



Uroptychus bacillimanus, Alcock and Anderson, Ann. Mag. Nat. Hist., Jan. 1899, p. 25. 

 Illustrations of the Zoology of the Investigator, Crustacea, Plate XLV. Pig. 3. 



Nearest to U. gracilimanus, Henderson, from which it seems to differ only 

 in having the carapace pitted and the posterior border of the propodites of the 

 legs unarmed, and to the Atlantic U. rubrovittatus, A. M.-Edw., from which it 

 differs in having slender chelipeds and also the posterior border of the propodites 

 of the legs unarmed. 



Carapace unarmed, except for a tiny spinule at either antero-lateral angle 

 and another even smaller at the outer angle of either orbital notch ; its surface 

 covered with a fine squamiform pitting, its lateral borders with a regular 

 squamiform crenulation. 



Rostrum triangular, simple, acute, more than a third of its length projecting 

 beyond the eyes. 



Abdomen smooth ; the third to sixth pleura rounded. 



Eyes small, their major diameter less than a fifth the length of the rostrum, 

 brown in colour. 



Antennal acicle acutely triangular, reaching about two-thirds the distance 

 along the terminal joint of the antennal peduncle. 



Chelipeds in both sexes about twice the length of the fully extended body, 

 very slender in the male, still more slender in the female, perfectly smooth, but 



