NO. 3574 COPEPOD CRUSTACEANS — LEWIS 35 



regions of ovoid bodies. Posterior median cephalothoracic region with 

 several spinules dorsally. 



Female free fourth pedigerous segment distinct from cephalotho- 

 rax and genital segment, greatest length, excluding alae, slightly 

 less than one-fifth the length of cephalothorax. Segment broadest 

 medially, with short, necklike region anteriorly. Alae small, sub- 

 rectangular although shape variable, arising from broad medial 

 portion of segment, extending posteriorly over part of anterior dorsal 

 surface of genital segment. Alae not connected as indicated by 

 Shiino (1954b). Median dorsal surface of segment with several 

 spinules. 



Female genital segment (fig. 13a) broad, lateral margins u-regular, 

 lateral siu-face projecting laterally past ventrally swollen medial 

 region. Anterior end of segment narrow, bearing pair of heavily 

 sclerotized, leglike plates (fig. 13e) ventrally, each with fimbriated 

 edge. Plates connected by ridge of heavy sclerotization similar 

 to interpodal plates of fourth thoracic legs. Homologies of struc- 

 ture unknown, no comparable structiu-e on male or on members of 

 genus Elytrophora, which appears closely related to Euryphorus. 

 Posterior sm-face of genital segment irregular, with pair of knobby 

 projections ventrally, in region of oviducal openings and with pair 

 of small, lappet-shaped projections dorsally, overlapping egg strings. 

 Female fifth legs (fig. 13c) situated ventral and lateral to base of 

 lappet-shaped projections, consisting of 2 nodules, first bearing 

 single plumose setule, second bearing 3 plumose setules. 



Female abdomen (fig. 12a) elongate, distinctly separable from 

 genital segment ventrally, indistinctly separable dorsally. Segmen- 

 tation of adult female obscured although suggestion of 3 segments. 

 First segment approximately 65 percent of total length, slender, 

 bearing paii' of large, curled, or uncm'led flaps projecting posteriorly 

 past caudal rami. Division between fii'st and second segments 

 suggested only by end of base of flaps although division complete 

 in male. Second segment elongate, forming 25 percent of abdomen 

 length. Division between second and thu'd "segments" indicated 

 by cuticidar constriction, third "segment" short, approximately 9 

 percent of abdomen length, median posterior sm'face projecting 

 slightly in biconvex anal region. Caudal rami (fig. 13/) ovate, mar- 

 gins irregular, distal inner surface plumose; distal sm-face with 2 

 large plumose setae from tubercular projection, 2 additional large 

 setae, one on either side of projection, and 2 plumose setules. 



Male cephalothorax (fig. 125) similar to that of female although 

 indentation of lateral margin less distinct and posterior median 

 region with fewer dorsal spinules. Free fourth pedigerous segment 

 similar, alae smaller, of general ovoid shape. Genital segment (fig. 



