18I7.J GENUS GRAPSU9. 99 



with the second joint of the tibia, armed with moveable 

 spines; hands equaU 



SPECIES, 



G. cinereus. Thorax rugose, with a sinus be- 

 hind the anterior angle; clypeus entire; third joint of the 

 first pair of feet serrate within, and dentate at the tip; car- 

 pus onc-spined; hands granulate beneath. 



Found in the Gulf-Stream, common. 



Grapsus cinereus? Latr. hist. nat. Crust, et Ins. from 



Bosc 



Cancellus marinus minimus quadi'atus^ Sloane's Jam. 



vol. 2. tab. 245, fig. 1. 



Thorax cinereous, varied with brown, anterior angles 

 acute, with a sinus behind them on the edge, between the 

 eyes are two impressed, abbreviated lines; clypeus entire, 

 hardly undulated at tip; third joint of the anterior feet ser- 

 rate on the inner edge, at the tip four-toothed; carpus with 

 an obtuse tooth within; hands rather large, granulate be- 

 neath; Jingers dentate within, teeth conspicuous; all the 

 remaining feet, except the last, dentate at the hind tip of 

 the third joint, that of the second pair with a much larger 

 tooth; all rugose above, and, with the exception also of the 

 posterior pair, armed with two moveable, short spines, at 

 the tip of the third joint, which are separated by an impress- 

 ed line, which is obsolete on the last pair; ^ye-^ sanguineous. 

 Length two fifths of an inch. 



Taken by captain Hamilton in the Gulf- Stream, and by 

 him presented to the Academy. Sloane, in his history of 

 Jamaica, calls it Cancellus marinus minimus quadratus^ 

 and observes that it is found on Sargaso cind other sea 

 plants. VV'e also learn that Columbus, in his celebrated 

 voyage which discovered the West Indies to the civilized 



