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specimen (c?) of the Paris Museum. It is a pity, that my only adult specimen is a 9, in which 

 the specific characters, especially with regard to the chelipeds, are less distinct than in the ö\ 

 The carapace is much flattened and the regions are tolerably distinct; the four post- 

 frontal lobes are sharply defined, and the groove between the median lobes, that are i 1 /,, times 

 as broad as the lateral ones, is very deep ; there is an indistinct posterior lobe on each lateral 

 postfrontal lobe, which latter is separated from the inner orbital border by a furrow ; the meso- 

 gastric region is somewhat inflated, small and rounded posteriorly, anteriorly it extends with an 

 elongated process into the groove between the median postfrontal lobes; the cardiac region is 

 short, of the same "breadth as the mesogastric area; the intestinal region rather indistinctly 

 defined laterally by the branchio-intestinal furrows; the hepatic regions are flattened, somewhat 

 roughened, the outer branchial areas provided with a few oblique lines, the largest of which 

 is situated posteriorly and passes above the bases of the last walking legs. The w h o 1 e 

 carapace is punctate, and nearly all of the pits are beset with a small 

 tuft of hairs; these tufts are largest on the anterior margin of the postfrontal lobes and 

 on the protogastric region, very minute on the branchial regions, where they are arranged in 

 oblique rows, following the usual branchial lines ; on the intestinal area they are> elongated- 

 transverse. 



The front is vertically deflexed and not visible from above ; it is four times as high as 

 broad, roughened by tubercles, of which a transverse row of 3—4 large ones is placed im- 

 mediately beneath the median postfrontal lobes; the lateral margins are somewhat convergent 

 anteriorly and the anterior margin presents a large, shallow sinus in the middle, somewhat less 

 broad than the lateral lobes. that slope obliquely backward to the subrectangular lateral angles 

 of the front. The front between the eye-stalks occupies nearly 6o°/ of the distance between 

 the external orbital angles, and the latter distance is slightly less than the lengt h of 

 the carapace in the median line 1 ). The supra-orbital border is straight and oblique in 

 its inner, concave in its outer part and the external orbital angle is acute, prominent, directed 

 straight forward. The lateral margins of the carapace, that present two very indistinct 

 thickenings or traces of epibranchial teeth behind the external orbital angle, 

 are not exactly parallel, but very slightly concave in the middle of their course and diverging 

 backward towards the bases of the second pair of walking legs, so that the greatest 

 breadth of the carapace exceeds its lengt h. The posterior margin is (in the 9) 

 distinctly less broad than the front. 



The epistome is of the usual shape in Sesar/na, but there is a quadrate depression in 

 the middle of the surface and the posterior margin projects in the median line, where a ridge 

 parts backward on the palate. 



The abdomen of both sexes presents nothing remarkable. 



The chelipeds are equal in size, both in the young cT and in the 9- In the latter sex 

 they are short, equal in length to the greatest width of the carapace. Meropodite in 9 short, 

 margins sharp, upper border convex, with a small, subrectangular prominence near the distal end, 



1) In the young ,ƒ, however, the reverse is the case. 



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