103 



epibranchial tooth. The regions of the carapace are not very well defined. 

 The tip of the mesogastric area is hardly distinguishable apart from the groove 

 separating the epigastric crests. The epibranchial regions are somewhat tumid 

 just behind the wings of the broad shallow cervical groove, the tumidity almost 

 forming a transverse ridge. 



Front in the adult about two-tifths the greatest breadth of the carapace, 

 well deflexed, square-cut, with the free edge nearly straight ; there may be a few 

 small tubercles on its dorsal surface, and some of them tend to fall in a line 

 parallel with its edge. 



External orbital angle well formed but not prominent, not separated from 

 the lower border of the orbit by any gap. 



Antero-lateral borders of carapace short, sharp, but scarcely crest-like, not 

 denticulate ; lateral epibranchial tooth small but distinct and sharp. 



Epigastric crests with a sharp sub-crescentic edge, overlapping, and well in 

 advance of, the sharp post- orbital crests. Each post- orbital crest consists of 

 two portions, an inner and longer and nearly straight portion, which ends just 

 inside the line of the orbital tooth, and an outer shorter (and sometimes less 

 distinct) portion lying somewhat obliquely behind the outer end of the main 

 part of the crest. 



In the abdomen of the adult male, both the 6th and the 7th segments are 

 slightly longer than broad. 



Antennal flagellum very short, but quite visible. 



In the external maxillipeds the exopodite is longer than the ischium and is 

 non-flagellate ; and the merus is much broader than long; the longitudinal 

 groove on the ventral surface of the ischium is faint, sometimes very faint. 



The terminal joint of the mandibular palp is bifurcate from the base, and 

 consists of two lobes— a broad anterior lobe overlapping the ventral surface of 

 the mandible, and a narrower falciform lobe which lies behind the incisor edge 

 of the mandible. 



The chelipeds are very unequal in the adult male, but are subequal in the 

 female; merus and carpus with fine squamiform sculpture, hand practically 

 smooth; carpus with the usual spine at its inner angle; in the larger cheliped 

 of the male the dactylus, which is barely as long as the palm, is strongly arched 

 and meets the fixed finger only at tip. 



The legs are considerably longer than the smaller cheliped, and the 

 posterior border of the propodites is armed with sharp, horny-looking spines 

 like those of the dactyli; the longer propodites are about twice as long as 

 broad, and are shorter than the broad comjjressed dactyli. 



In the largest female, which is fully adult, the carapace is tVths inch long 

 and iiths inch broad. 



— — . Mergui. J. Anderson. ^ S > ^ 9 (among which are, probably, 



o the types of the species). 



