GRAPSOIDEA. 



long, being shorter than the breadth of the carapax. The hand at 

 base is only fine granulous ; the upper and moveable finger is broadest 

 towards base and narrow towards apex ; the lower finger has the apex 

 curved outward ; the arm is not crested on the anterior margin. It 

 may be an individual of the G. maracoani, with the right or large 

 hand partly grown after mutilation. Length of carapax, twelve and 

 three-fourths lines ; breadth, eighteen and three-fourths lines ; breadth 

 across the anterior angles slightly greater than that a short distance 

 posteriorly. 



G. maracoani, LATR. Encyc., pi. 296, f. 1; EDWARDS, ii. 51. 



GENUS HELCECIUS, Dana. 



Gelasimo affinis, antennis internis longitudinalibus, juxta frcmtem utrin- 

 que insitis, externis fronte paulum remotis, articulo maxillipedis ex- 

 terni Stio breviore quam 2dus. Rdes maris antici subcequi. Articuli 

 maxillipedis externi %dus Stiusque sulco lineatofere longitudinalibene 

 notati. Abdominis articulus 2dus maris sterno vix angustior. 



Related to Gelasimus, the inner antennjB being longitudinal either 

 side of the front, and the outer at a distance from the front, and 

 the third joint of the outer maxillipeds being much smaller than the 

 second. Anterior feet of male subequal. Second and third joints 

 of outer maxillipeds marked with a linear sulcus, which is nearly 

 longitudinal. Second joint of male abdomen hardly narrower than 

 the sternum behind. 



One of the species here included, the cordiformis, has been referred 

 to Gelasimus. But in Gelasimus, the outer maxillipeds have seldom 

 the sulcus here described, the anterior feet are always very unequal, 

 and the male abdomen at base is much narrower than the sternum 

 behind. Besides, the habit is different. The buccal mass is some- 

 what projecting, approaching that of Do to and Myctiris; the surface 

 just back of the anterior angles of the carapax is more abruptly inclined, 

 being nearly vertical for a short distance, which gives this portion of 

 the animal a fulness not seen in Gelasimus, and the orbits the appear- 

 ance of a somewhat lower position, in a front view. Yet the general 



