COPEPODS OF THE WOODS HOLE KEGION 



255 



Distribution. — Scottish coast (T. Scott) ; Norwegian coast (Sars). 



Color. — Body transparent with a whitish tinge, but without pig- 

 ment markings ; eye invisible. 



Feviale. — Slender and cylindrical, with almost no distinction be- 

 tween metasome and urosome ; cephalic segment short ; rostrum small 

 but well defined and acute at the tip; urosome four-fifths as long as 

 metasome; genital segment not divided; anal segment as long as 

 penultimate segment; caudal rami as long as anal segment, tapered 

 distally, each with a dorsal tooth and filiform seta in front of the 

 middle, two or three outer 

 setae, and an apical seta 

 which is stout and spini- 

 form proximally and passes 

 abruptly at an angle into a 

 filiform distal portion. 



Two basal segments of 

 first antennae enlarged and 

 together as long as the 

 other five segments ; exopod 

 of first leg much shorter 

 than basal endopod seg- 

 ment, the latter linear with 

 an inner seta; no inner 

 setae on any of the exopods ; 

 fifth leg triangular, with a 

 stout terminal spine, 4 in- 

 ner and 3 outer setae, with- 

 out any trace of segmenta- 

 tion. Total length, 0.75- 

 0.85 mm. 



Male. — As large as the 

 female ; cephalic segment 

 less than half as long as the 

 rest of the metasome, the 

 other body segments all 



about the same length; genital segment distinctly divided; caudal 

 rami slender, half the length of the anal segment, three times as long 

 as wide ; apical setae enlarged at the base and filiform distally. First 

 antennae much longer than the cephalic segment, the two basal seg- 

 ments together considerably longer than the rest of the antenna, the 

 fourth segment sw^ollen and armed with a slender aesthetask. The 

 exopod of the second antenna is somewhat stouter than in the female, 

 with two subequal apical setae. The terminal claw of the maxilliped 

 is shorter than the second segment and without an accessory spine. 

 The first endopod is twice the length of the exopod and has three 

 apical setae, the inner one very small ; its basal segment is five times 



Figure 166. — Evansula incerta: a, Male, dorsal; 

 b, c, d, e, male, first, second, third, and fourth 

 legs ; /, male, fifth and sixth legs ; g, female, 

 fifth leg 



