Ill 



The front is well arched, thin, not dcpj-essed more than 

 the anterior part of the carapace, without a groove along 

 the margin as in A. hispinom, rather less than half the 

 width of the carapace, n-ot greatly accentuated from the 

 upper orbital border; upper orbital border entire ending 

 rather obtusely at the external angle, the oblique extent be- 

 ing equal to about half the front. 



Antero-lateral margins slightly arcuate, with a faint in- 

 sinuation near the lateral angle, but no spine; postero-lateral 

 margins slightly converging; posterior margin very slightly 

 insinuate. 



The antennules when folded are well covered by the 

 front. 



The sub-orbital margin is entire, the inner sub-ocular 

 angle prominent. The ophthalmopods have a small tubercle 

 above. 



The basal antennal joint does not attain to the process 

 of the sub-ocular angle, but on the other side reaches a sub- 

 frontal process, the third joint reaches the margin of the 

 front, the flagellum is slightly longer than the three pedun- 

 cular joints together. 



The epistome is short and somewhat sunken. 

 The endostomial ridges are distinct. 



The upper margj.n of the buccal frame is arcuate, with 

 the external ends prominent. 



The oblique pterygostomial ridges are well marked. 

 The external maxillipeds are broad and well cover the 

 buccal orifice ; the ischium presents a nearly flat surface, and 

 its lower internal angle is not much cut away, the margin bor- 

 dering the merus is slightly oblique ; the merus is sub-quad- 

 rate, very slightly projecting at the external distal angle, 

 slightly insinuated on the distal margin, the inner distal angle 

 truncated with the upper end of this somewhat accentuated, 

 the surface is scarcely excavate. The exopod barely attains 

 to the external angle of the merus. 



The chelipeds in the female are sub-equal, the merus 

 reaches the lateral angle of the carapace, and bears a 

 small spiniform tubercle about the middle of its upper edge : 

 the carpus is sub-quadrate on the upper surface, which is 

 convex, with a strong inner projection or tooth : the hand is 

 short, laterally compressed, smooth, and rounded on the out- 

 side, on the inner side it is vertically abrupt : the fingers are 

 nearly as long as the palm and much compressed laterally : the 

 immobile finger has an oblique ridge below, extending for a 

 short distance on to the palm, otherwise the fingers are not 

 markedly ridged, they are crossed at the tips, and in that 



