NO. 3573 COPEPODS — HUMES AND HO 5 



Segment of leg 5 (fig. 23) 29/^ x 67/x. Genital segment longer than 

 wide, 164/x x 122/i in greatest dimensions, and in dorsal view rather 

 bottle shaped, its lateral borders gently rounded. No intersegmental 

 sclerite ventrally between these 2 segments. Fom- postgenital seg- 

 ments 18)u X 45)U, 19iJ, X 43ju, 15/x x 40ju, and 17/i x 43/x, respectively, 

 from anterior to posterior. 



Caudal ramus (fig. 24) resembling that of female, but slightly less 

 elongated, its greatest dimensions 31jLi x 21ju, or 1.48 times longer 

 than wide. 



Surfaces of prosome and urosome with minute hairs as in female. 

 Ratio of length of prosome to that of urosome 1.56:1. 



Rostral area like that in female. 



First antenna resembling that of female, but an aesthete added on 

 segments 2 and 4 (at exact points indicated by arrows in fig. 7), so 

 that formida is 4, 13 + 1 aesthete, 6, 3 + 1 aesthete, 4 + 1 aesthete, 

 2 + 1 aesthete, and 7+1 aesthete. Second antenna (fig. 25) more 

 slender than in female, and last segment elongated, 68;^ along outer 

 edge, 52 IX along inner edge, and 15/i wide. First segment with inner 

 crescentic row of small spinules. Second segment with numerous 

 small spinules along inner surface, arranged in 2 groups proximal and 

 distal to seta. Last segment with row of very small spinules along 

 inner surface. Armatiu-e like that of female, but 2 claws more nearly 

 equal in length (34/i and S5fi), though posterior claw more slender 

 than other. 



Labrum, mandible, paragnath, first maxilla, and second maxilla like 

 those in female. Maxilliped (fig. 26) 4-segmented (assuming that 

 proximal part of claw represents fourth segment). First segment 

 unornamented. Second segment bearing on medial surface 2 setae 

 and 2 rows of long spinules. Small third segment unarmed. Slender 

 slightly recurved terminal claw 178^ in length (measiu-ed along axis), 

 with narrow terminal lamella, smooth lamellar fringe along its concave 

 sm*face, and 2 setae near its base, one on posterior surface 44)U long 

 and finely barbed, other on anterior siu"face 17 ix long, naked, and 

 hyaline. Suggestion of division about midway along claw. 



Postoral area resembling that of female. 



Legs 1-4 resembling those in female and with same spine and setal 

 formula, except for endopod of leg 1 (fig. 27), which has arrangement 

 of 0:1 ; 0:1 ; 1,1,4. On last segment of this endopod 2 spines, outermost 

 of setae in female being here replaced by a spine; outer spine 29)u long, 

 inner spine 43/* long and recurved distally, and both spines with strong 

 lateral spinules. In alcoholized specimens last segment of endopod 

 flexed outwardly. Terminal spines on endopod of leg 4 in one male 

 19)Li (outer) and 51ju (inner), in another 16/1 and 37)u, with an average 

 of 17.5/1 and 44/i, ratio of 1:2.5. 



