174 



far beyond the eyes, and is transversely sinuate and obliquely 

 depressed ; its outer ends have distinct closed incisions, but 

 there is no sign of a median notch. 



The antero-lateral margins are arcuate, much longer than 

 the postero-lateral, cristate, thin, and divided into four lobes 

 by distinct notches. The postero-lateral margins are concave 

 and much converging, making the sharply-accentuated pos- 

 terior margin narrow. 



The sub-orbital and pterygostomial regions are granular, 

 as also is the epistome and basal joints of the antennae. 



The sternal plastron is punctated. 



The pleon of the male is narrow, five-segmented, the first 

 two segments occupying all the space between the last pair of 

 legs, the three coalesced segments are wider at the base and 

 tapering, the last segment is a small truncated triangle. 



The orbits are oval, rather small, with two closed inci- 

 sions above and one below near the exterior angle, the inter- 

 nal sub-ocular angle is only slisfhtly accentuated. The ocular 

 peduncles are much curved, do not fill the orbits, and each has 

 a small tubercle close to the eye. 



The fossettes are slightly oblique beneath the strongly 

 over-arching front ; the basal joint of the antennule has a 

 strong oblique lip-like ridge. 



The epistome is narrow and sunken, anteriorly it is con- 

 tinuous with the interantennulary septum, an oblique line tra- 

 verses it from the bases of the antennae, becoming obliterated 

 medianly. 



The basal joint of the antenna is very oblique and tightly 

 wedged in between the sub-frontal thickening and the subocu- 

 lar region, its distal anterior half is cut away on account of 

 this thickening, the end reaches the sub-ocular angle. The 

 remaining joints and the flagellum are very small and lie in 

 the orbit. 



The buccal frame is subquadrate, its anterior margin is 

 somewhat arched and is somewhat sunken, dipping a little in 

 the middle : it has a median and two lateral closed incisions. 



The external maxillipeds completely close the buccal ori- 

 fice. The merus is granular, with a depression on the exter- 

 nal surface, subquadrate, with the internal distal angle trun- 

 cated and the distal margin slightly oblique ; it is about half 

 as long as the ischium, the division-line between them having 

 an insinuation ; the ischium is less granular and somewhat 

 punctate, and has a longitudinal groove. The exopod nearly 

 reaches the external angle of the merus. 



The chelipeds are robust, the merus is trigonous, not 

 reaching as far as tlie margin of the carapace ; its upper edge 

 bears some irregular tubercles and a few coarse hairs. The 



