The Amphipoda of Bermuda. 



91 



In female, first gnathopods with trapezoidal epimeron projecting 

 anteriorl}- by acutel}' rounded angle, ventral margin slightl}- rounded 

 and armed with numerous short setae ; second joint robust, extend- 

 ing well be3'ond epimeron, anterior margin straight with small flat 

 rounded lobe at distal end ; third and fourth joints short, fourth 

 joint triangular, widened distally, provided with setae at apex and 

 on posterior margin ; wrist triangular armed with a few rather long 

 stout setae on rounded posterior margin which forms a kind of lobe 

 so that the wrist is broader than the hand, wrist provided with 

 several fascicles of setae on surface ; hand rather long, about ^/s 

 longer than wrist, subrectangular with anterior and posterior margins 

 nearly parallel, with posterior margin and palm provided with many 

 setae of different lengths, palm oblique and passing evenly into 



Fig. 35. Amphithoe ruhricata (Montagu). 



posterior margin, prehensile angle with a large submarginal spine ; 

 finger very long and slender with inner concave margin serrate. 



Second gnathopods with rectangular epimeron nearly as long as 

 high, convex on ventral margin which is armed with many short 

 setae ; second joint similar to that of first gnathopod ; third joint 

 short ; fourth joint twice as long as broad with wrist attached to 

 anterior margin, provided with setae apically and on posterior mar- 

 gin ; wrist more or less triangular, posterior margin strongly convex 

 forming a lobe which makes the wrist wider than the hand ; haiid 

 subrectangular, much shorter and stouter than that of first gnathopod, 

 palm oblique and forming with posterior margin a small process 

 which bears a submarginal prehensile spine, anterior margin pro- 

 vided with 4 fascicles of slender setae, posterior margin and palm 



