Boone, Crustacea, Cruise of "Alva," 1931 



89 



along their lateral margins ; the thicker, longer flagellum is two- 

 thirds as long as the peduncle. 



The antennae have a typical Peneus scaphocerite, the distal 

 fourth of which extends beyond the antennular peduncle; the 

 flagellum is quite long. 



The external maxillipeds extend two-thirds of the length of the 

 scaphocerite and have the rounded distal article arising from the 

 external distal angle of the propodus and elongate-clavate, as long 

 as the propodus and with the distal end rounded. The inner distal 

 angle of the propodus is produced beyond the base of the dactyl 

 as a blunt thick node, one-sixth as long as the propodus, distally 

 truncate and supporting a tuft of setae almost as long as the 

 dactyl. The dactyl is much compressed laterally, distally rounded, 

 with the outer lateral and distal margins setose. 



The first, second, third and fourth pairs of legs bear epipo- 

 dites ; there are none on the fifth pair of legs nor on the external 

 maxillipeds. 



The first pair of legs each bear an antrorse spine arising from 

 the inner ventral, distal angle of both the basis and ischium ; the 

 second pair of legs have this spine arising only from the basis 

 joints. 



The third pair of legs is much the longest ; the first pair extend 

 to the base of the propodal joint of the third maxillipeds ; the sec- 

 ond pair of legs extend to midway the dactyl of this maxilliped ; 

 the third and longest pair of legs extend as far as the third maxil- 

 liped or slightly beyond it and is very weakly chelate. 



Text figure 5 — Peneus monodon (Fabricius), petasmas of adult male, 

 shown from posterior side, X 4. 



