105 



The rostral liorns are rather long, slender, tapering, not 

 divergent, projecting horizontally, slightly distant; each is 

 bifid at the apex, with a lateral spine lower down on the 

 distal third, and a faint spinule near the base on the outer 

 side. 



The upper orbital border is slightly raised, and Ijears 

 a large supra-orbital spine, which is curved forwards and 

 outwards, and immediately anterior to this there are two 

 or three minute teeth on the margin. There is a post-ocular 

 spine on the hepatic region, and below and behind it the 

 sub-hepatic region is visible from above as a conical promi- 

 nence tipped with two small teeth. The branchial regions 

 have each a lateral spine. 



The posterior margin is medianly slightly insinuate, and 

 towards the sides bears a row of minute spinules. 



A faint median groove extends from the rostral horns 

 a short distance behind on the narrow inter-ocular space. 



The ocular peduncles are thick, and the eyes well deve- 

 loped and retractile towards the sides of the carapace. 

 There is a small spinule on the anterior side of the peduncle. 



The antennular fossettes are elongate, and the median 

 ridge between each is produced to a large downward pro- 

 jecting spine. 



The basal antennal joint is narrow on the part 

 forming the external boundary of the fossette. It appears 

 slightly grooved longitudinally, and is curved to form the 

 lower border of the eye socket, it distally bears a strong 

 spine, which projects forwards and downwards and very 

 slightly outwards. The portion which limits the fossette bears 

 three or four spinules along its length, with a few very 

 small ones on the external border; the basal portion of tlje 

 joint is continuous with the epistome. The second pedun- 

 cular joint is short, the third long, the flagellum sparingly 

 furnished with long setae. 



The epistome is long and narrow. 



The antero-external angles of the buccal frame are promi- 

 nent and acute, the upper margin dips medianly into the 

 cavity. 



The pterygostomial region has a prominent oblique 

 ridge, which bears a strong spine about the middle. 



The sternal plastron has a strong, transverse, lunate 

 ridge between the bases of the chelipeds, this ridge has its 

 outer ends spined ; a rather large excavated area exists be- 

 tween the ridge and the base of the buccal frame; on the 

 posterior side the ridge is reached by the terminal segment 

 of the pleon. 



The pleon is composed of six segments in the male. The 



