2(50 CARCINOLÜGICAL STUDIES. 



the arcuate iuner margin of the upper part of' 

 the palm finally, between the articulation of the mobile 

 finger and that of the carpus, is formed by a crest of 

 small granules (fig. 6^). The mobile finger is a little 

 punctate at its base, for the rest quite smooth, and its 

 upper margin presents a longitudinal row of seven 

 or eight small acute teeth on its proximal half. 

 The inner margin is armed with ten or twelve small teeth , 

 of which one at the base, one in the middle and one at 

 the end are a little larger. The index is conical, its outer 

 surface convex and smooth, not at all punctate, 

 like that of the mobile finger, and the under margin is also 

 smooth; its inner margin is armed with several teeth 

 of somewhat unequal size. 



The ambulatory legs are stout. The meropodites 

 are enlarged, so that e. g. those of the penultimate 

 pair are only a little more than twice as long as broad 

 (8 'A mm. long and 3V2 mm. broad); these joints are trans- 

 versely rugose on their outer surface , their upper margin 

 ends into an acute tooth before the distal end and the 

 lower margin is unarmed as usually. The propodites are also 

 short, those of the penultimate pair e. g. are scarcely 

 three times as long as broad and the dactylopodites of all 

 the legs are a little shorter than the propodites. The three 

 last joints are hairy on their margins. 



Distance between the external orbital angles . I2V4 mm. 



Greatest width of the cephalothorax . . . . I2V2 » 



Length of the cephalothorax 10 » 



Breadth of the front between the orbits . . T'A » 



Ses. sulcata Smith is , indeed , closely allied to our spe- 

 cies , but the interregional grooves , especially on the an- 

 terior part of the cephalothorax , are described as deep 

 and well marked sulci, from which this species has 

 doubtless received its name , so that I suppose it to be a 

 different form , though it may be possible that the absence 

 of grooves in our individual from Cura9ao must be ascri- 



Notes from the Leyden Museum , Vol. XI V. 



