276 



Rostrum from two- fifths to less than a third the length of the carapace, its 

 horizontal portion has an obscurely bifid ending. 



The great median gastric spine is very much larger than the cardiac spine, 

 which again is a little larger than the paired gastric spines. Of the two oblique 

 spines of the lateral borders the hepatic is much larger than the antero-lateral. 

 Posterior border quite smooth. 



The 2nd-4th abdominal terga are deeply grooved transversely and are only 

 obscurely granular, each is armed with a median procurved spine, of which the 

 third is smaller and blunter than the first two. The pleura of the 2nd abdominal 

 somite are tubercular, like the carajjace : those of the 3rd and 4th are only 

 obscurely so. The last two terga and the telson are smooth and polished, except 

 for a few scattered vesiculous granules on and near the telson. 



Eyes large, freely movable, somewhat reniform on the inner side. The 

 basal joint of the antennular peduncle ends externally in two spines, one of which 

 is large. The antennal peduncle is non-spinose, and the flagellum is much longer 

 than the body. 



The ventral border of the merus of the external maxillipeds is subcristiform 

 and cut into 2 or 3 spines, 2 of which are very large. 



The chelipeds are much shorter than the extended body : the borders of the 

 merus and carpus end in teeth or spines none of which are conspicuous except 

 one on the carpus : the fingers are longer than the palm, straight, incurved at 

 tip, and deeply excavated on the inner surface. 



The legs are a little longer than the chelipeds : they are non-spinose except 

 for the terminal teeth or spines of the merus, and their dactyli have the posterior 

 edge serrated. 



The colours in life, as observed in these seas, varies from dull chalky-orange 

 to bright orange red with whitish patches. 



Bay of Bengal, 1300, 1310 and 1520 fathoms; Arabian Sea, 1022 and 1070 

 fathoms. 



In the largest specimen— an egg-laden female — the total length of the fully 

 extended body is 51 millim., that of the chelipeds 32 millim. 



7667 8874 79 6108 9326 3413-3416 



Regd. Nos. ^ : ^ 



7 * y * 9 " 10 



Galacatltha rostrata var. Investigatoris, Ale. & Anderson. 



Galacantha investigatoris, Alcock and Anderson, Journ. Asiatic Soc. Bengal, LXIII. pt. 2, 1894, p. 173. 

 Illustrations of the Zoology of the Investigator, Crustacea, Plate XII. Fig. 4. 



Differs only in the following unimportant particulars : — 



All the abdominal terga behind the 1st (including the telson) and pleura are 



