6 aS'. I. Smith on Brazilian Crustacea. 



thin and four lobed ; the median lobes are very mucli the largest, are 

 evenly rounded, and a little more prominent than the lateral, which 

 project as small obtusely triangular teeth. The superior margin of 

 the orbit is broken by two incisions leaving the margin between them 

 projecting as a slight, rounded lobe. The post-orbital tooth is short 

 and slender, and is separated from the second tootli of the antero- 

 lateral margin by a broad sinus whicli breaks the margin completely. 

 The remaining teeth of the antero-lateral margin are triangular in form, 

 much thickened vertically, and separated by quite broad sinuses, and 

 the posterior two on each side are very slender and of nearly equal 

 prominence. 



Beneath, tlie edge of the front is thin and projects sharply down- 

 ward. The epistome is smooth and its labial border has a small lobe 

 in the middle, a slight notch each side and another at each angle of 

 the buccal area. The external maxillipeds are smooth except the me- 

 rus, which is slightly granulated and also has the antero-exterior angle 

 very slightly produced laterally and not at all rounded. The inferior 

 margin of the orbit is prominent and divided into two lobes by a deep 

 and narrow sinus ; the inner lobe forms a stout tooth which projects 

 as far forward as the inner angle of the superior margin ; the outer 

 lobe is broad and its exterior angle projects slightly in advance of the 

 post-orbital tooth. The external hiatus of the orbit is a deep trian- 

 gular notch. In one specimen, however, it is wholly closed on one 

 side, possibly from some accident. The 'sub-orbital and sub-hejjatic 

 regions are quite coarsely granulous. The tubercle of the sub-hepatic 

 region forms a slight granulous prominence just beneath the post-or- 

 bital tooth. The sub-branchial region is pubescent and slightly gran- 

 ulous. In the male, the sternum is smooth and the abdomen quite 

 narrow, being narrowest at the penultimate segment, and the terminal 

 segment is about five-sixths as long as broad, and its extremity evenly 

 rounded. In the female the abdomen is broadly ovate, the greatest 

 breadth being at the fourth segment. 



The chelipeds are a little unequal. The carpi are granular-rugose 

 externally and have a deej? groove along the outer margin next the 

 articulation with the hand. The hands are slightly rugose above, and 

 the fingers are slender, deflexed, marked with slight, impressed longi- 

 tudinal lines and slightly and obtusely toothed mthin, and the dacty- 

 lus in the larger hand usually has a stout tooth at the base. The 

 ambulatory legs are slender, and pubescent along the edges of all the 

 segments and over the whole surface of the dactyli. 



