232 A. Alcock — Garcinological Fauna of India. [No. 1, 



(2) the regions though as well defined are not nearly so much 

 broken up into tubercles : 



(3) just behind the 3rd tooth of the antero-lateral margin is a 

 distinct indentation, making the anterior end of the postero-lateral 

 border dentiform : 



(4) the chelipeds are distinctly stouter and the hand is concealed 

 in a fleshy glove : 



(5) the first pair of legs is as stout as the fourth. 

 Length of carapace 5 millim., breadth 7 millim. 



Colours in spirit, white, with a wider and more angular network 

 of fine dark lines. 



In the Indian Museum is a single female from off Ceylon, 26J fms. 



Appendix to Hyperolissa ? 



Plattpilumnus, Wood-Mason. 



Platipilumnus, Wood-Mason MS., Alcock, Ann. Mag. Nat. Hist. May 1894, 

 p 401. 



Carapace hexagonal — the prominent bilaminar horizontally-pro- 

 jecting front forming the shortest side of the hexagon — thin, depressed, 

 perfectly flat, with the regions and subregions very faintly impressed : 

 the antero-lateral borders are spinate, the postero-lateral are slightly 

 convergent, and the posterior border is long. 



Front about a third the greatest breadth of the carapace. Upper 

 margin of orbit spinate, the inner angle of the lower margin acutely 

 spiniform. 



The antennules fold transversely. The basal antennal joint, though 

 of fair length, does not reach the front; the next joint lies loosely in 

 the wide orbital hiatus ; the antennary flagellum is long, about twice 

 the major diameter of the orbit. 



Buccal cavern quadrangular, very well defined anteriorly ; the 

 external maxillipeds do not nearly cover it, but leave the efferent 

 branchial channels permanently widely open ; the endostomial ridges 

 that define these last are well defined posteriorly, bnt do not reach the 

 anterior border of the buccal cavern. 



Chelipeds in the female, markedly unequal, fingers long, pointed. 



Legs long, slender, compressed, spiny. 



As there is only a single female in the Indian Museum, I cannot be 

 sure of the place of this genus in the system. It probably belongs to 

 the Cancroidea, and should be placed near Galene. 



