838 CRUSTACEA. 



minis partim celatij 2di Imique biramei, ramis incequalibus, extus 

 non prcecipue armatis. 



Cephalothorax narrow elliptical, abdomen inflexed under the venter; 

 head subquadrate ; eyes situated at the anterior angles, and a little 

 prominent. Antennae pediform, with a very short flagellum, or 

 none, the inferior pair a little the longest. Four anterior feet sub- 

 chelate ; second pair much the stouter. Caudal stylets of the third 

 pair minute, simple, partly concealed by the extremity of the abdo- 

 men ; first and second pairs with the branches unequal, and not 

 specially armed on the outer side. 



The species of this genus, as the figures show, have somewhat of 

 a spider-like aspect, when seen in a dorsal view. The abdomen is 

 flexed commonly close against the venter, and is quite narrow, its 

 width being less than half that of the thorax. 



The branches of the stylets of the first and second pairs are subcy- 

 lindrical, and the inner of each is considerably longer than the outer. 

 Both are armed above with a few spines, in two series, and there are 

 longer spines at the extremity. The extremity of the abdomen is 

 gibbous and setose above, and covers mostly or wholly the third pair 

 of stylets. The species approximate in form to the Icilii, but have 

 the hands and antennae of the Corophinaa. 



Platophium brasiliense. 



Maris : — Corpus superne visum angustd ellipticum. Antennae infra 

 ciliatce; internee basi externarum breviores, flagello 3-&-articidato ; 

 externoe dimidio corporis paido Ion giores, flag ello 3-articidato. Pedes 

 lmi manu parvd instructi; 2di manu validd, oblong d, infra fere 

 recta, et pilis phimosis tenuissimis et longissimis (latitudine manus 

 longioribus) et confertis ornatd, carpo parce oblongo infra non pro- 

 dudo, articulo olio antice infra valde producto. Pedes 10 postici sub- 

 cequi) setts brevibus, sat paucis, articidi diametro 6ti non longioribus. 



Feminae : — Corpus latius ellipticum. Antennas paido breviores, internee 

 basi externarum paido longiores. Pedes 2di manu mediocri instructi, 

 lata, paulo oblong a, infra arcuatd et liirsutd, pilis long is non ornatd, 

 carpo non oblongo. 



Male: — Body seen from above narrow-elliptical. Antennae ciliate be- 

 low; inner shorter than base of outer, flagellum three to five-jointed; 



