Carcinologicdl Fauna of India. 187 



trum simple, shaped like the beak of a bird. Eyes retractile against 

 the sides of the carapace : a small pre- ocular and post-ocular spine, but 

 no definite orbit. 



Basal antennal joint slender throughout : the antennae visible, 

 dorsally, from the base of the second joint. 



Merus of the external maxillipeds produced antero-externally to 

 form a foliaceous lobe which covers the greatly produced efferent 

 branchial orifice. 



Abdomen in the male seven-jointed : in the female the fourth, fifth 

 and sixth segments, though distinctly recognizable, are firmly fused 

 together. 



Chelipeds in both sexes slender. Legs long and slender. 



Only eight branchiae on either side. 



Eneephaloides armstrongi, Wood-Mason. 



Encephaloides armstrongi, Wood-Mason, Ann. Mag. Nat. Hist., March, 1891 

 p. 259. 



Carapace heartshaped : its greatest breadth is equal to its length 

 with the rostrum : its surface in the adult is nodular or pustular, in the 

 young coarsely spiny. The gastric and hepatic regions are well-defined ; 

 but the cardiac and intestinal regions are entirely concealed by the 

 branchial regions, which rise up like a pair of mammae, and meet, but 

 without any fusion of walls, down the middle line. 



The rostrum, which is shaped exactly like the beak of a bird, is 

 about one-fourth the length of the carapace proper, and has a finely 

 serrated edge. 



In the male the abdomen is distinctly seven-jointed ; but in the 

 female the fourth, fifth and sixth segments are immovably sutured 

 together. 



The eyes which are small, slender, and unpigmented, are retractile 

 1 against the side of the carapace : there is a very narrow supra-orbital 

 eave ending anteriorly in a minute tooth, and there is a small post-ocular 

 spinule. 



On the dorsal aspect the antennae are plainly visible on either side 

 of the rostram, from the base of the 2nd joint of the peduncle : the 

 1 flagella, which are of hairlike tenuity, hardly surpass the tip of the 

 rostrum. 



Owing to the prolongation of the efferent branchial canal, the front 

 edge of the buccal frame is Y-shaped, and the merus of the external 

 maxillipeds ear-shaped. 

 33 



