CARCINOLOGICAL STUDIES. 257 



fers from the other species of this section of the genus by 

 the following characters. The cephalothorax is slightly 

 longer than broad and its upper surface, on which 

 the interregional grooves are distinctly indicated , is much 

 flattened. The lateral margins are nearly parallel, 

 though slightly concave in the middle. The front, that is 

 almost perpendicular, is a little broader than half the dis- 

 tance between the external orbital angles; its upper mar- 

 gin is divided by rather deep grooves into four lobes , of 

 which the internal ones are a little broader than the external , 

 and its inferior margin is widely and profoundly emargi- 

 nate in the middle. The posterior margin of the cephalo- 

 thorax is narrow. 



The arm of the chelipedes has a denticulate tooth on its 

 anterior margin and the wrist is unarmed, having no tooth 

 at its inner angle. The outer surface of the hands is finely 

 granulate, the inner surface presents a transverse row of 

 little prominent granules. The palm is provided with a 

 finely pectinated longitudinal crest as in Ses. 

 taeniolata , and , as in this species , the mobile finger is 

 marked on its upper margin with a longitudinal row 

 of forty small transverse ridges. 



The meropodites of the ambulatory legs are much enlar- 

 ged, the propodites elongate and the dactylopodites consi- 

 derably shorter than the propodites. 



13. Sesarma curagaoensis, n. sp. 

 (Pig. 6). 



The Leyden Collection contains one male specimen, found 

 by Mr. Neervoort van de Poll on the island of Cura9ao. 

 I describe it as a new species, with some doubt however, 

 not only because this specimen may be a young one , not 

 yet presenting the characters of the adult , but also be- 

 cause only a part of the literature on West-Indian Deca- 

 poda is at my disposal. 



Ses. curagaoensis , indeed , belongs to those species of the 



]N'otes from the Leyden IMuseum , Vol. XIV. 



17* 



