FAXON: XOTEsj ON' THE CKUSTACEA. 155 



Iconaxius caribbseus, sp. nov. 



Plate I. Figs. 1-4. 



Similar to Iconaxius acutifrons Bate, but different in the form of the ros- 

 trum, which is much broader than in I. acutifrons, less triangular in its out- 

 line, and broadly rounded at the anterior end ; the upper border of the 

 propodite of the larger cheliped, moreover, is entire, not denticulate as in 

 /. acutifrons. The eyes are larger, and more heavily pigmented. 



The margins of the rostrum are minutely denticulate, as in /. acutifrons, 

 the median keel entire. 



Length, 17 mm. 



Station 166. 150 fathoms. 1 specimen. 

 " 232. 88 " 1 " 



" 241. 163 " 3 



" 283. 237 " 1 (type). 



Lives as a commen.sal in Sponges of the genus Farrea. 



The genus Iconaxius, of which four species have been previou.sly described, 

 has a wide distribution in the warm and temperate seas. It has been recorded 

 from such remote localities as the Arabian Gulf, Banda Sea, Japan, Kerma- 

 dec Islands, and the Gulf of Panama. It is now for the first time recorded 

 from the Atlantic. 



Polycheles crucifer (W.-S.). 



Polycheles agassizii (A. M. Edw.). 



Polycheles sculptus Smith. 



