New Zealand Awphipod. 



573 



fidcnce in any of tliese diflfeiences as good specific cliaractcr.^, 

 and consider that the distinction must be made principally 

 by the cliaiacters of the first gnathopod of the male (.-'ee 

 fi;j;ure). For the sake of comparison, however, I ^ive here a 

 fewjiointsin which my (male) specimens appear to differ from 

 the other species, it being understood that in the characters 

 not mentioned there is no appreciable difference. 



Seba ti/pica : first gnathopod of male (highly magnified). 



In the antenna the second joint of the peduncle is more 

 slender than the first and is equal to it in length or only very 

 slightly longer; the lower antenna is hardly, if at all, shorter 

 than the upi)er ; in all the pereiopoda the meros is more or 

 less produced alongside tlie carpus; in the first pereiopod 

 this projection reaches about to the middle of the carpus, in 

 the last j)ereiopod it reaches slightly beyond the distal end of 

 the carpus, the intervening pereiopoda showing intermediate 

 stages; the first uropod has the peduncle a little shorter 

 than that of the second, the outer branch is longer than 

 the peduncle and about two thirds the length of the inner 

 branch ; in the second uropods the branches are subequal. 

 My specimens are about the same size as S. armata^ but 

 considerably smaller than S. Saundcrsii. 



