132 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



wavy, extending to ocular region, terminating in close proximity 

 to small grooves proceeding posteriorly from indentation of lateral 

 cephalothoracic margin. Eyes distinct, small, with small orbicular 

 crystalline body at outer edge of suborbicular region of dark pig- 

 ment, pigmented region contiguous on median longitudinal axis of 

 cephalo thorax. 



Free fourth pedigerous segment (fig. 33c) narrow, slightly more 

 than one-fifth the width of cephalothorax, distinct from genital seg- 

 ment and cephalothorax. Segment with posteriorly bilobed ala over- 

 lapping anterior region of genital segment dorsally, sinus between 

 lobes, deep, enlarged at apex. 



Genital segment (fig. 33c) broader anteriorly than medially, with 

 2 winglike expansions posteriorly. Median posterior surface forming 

 broadly U-shaped sinus dorsally, with 2 spinides from middle of sinus 

 apex. Lateral posterior surfaces, medial to wing-shaped expansions, 

 rounded, overlapping posterior processes, with 6 clawlike marginal 

 spinides. Segment with pair of heavily sclerotized processes pos- 

 teriorly, processes projecting well past caudal rami, with spine-bearing 

 ridge on inner dorsal surface. Distal end of processes spined on outer 

 and inner margins. Ventral surface of genital segment with lyre- 

 shaped process directed ventrally and anteriorly from origin in pos- 

 terior region of segment. Shiino (1955a, p. 179) terms this structure 

 "a pair of horn-like spermatophores . . . ." 



Abdomen (fig. 33c) termed 2-segmented by Capart (1953) and 

 Shiino (1955a) although segment division indistinct and incomplete. 

 Abdomen arising in apex of posterior sinus of genital segment, from 

 posterior end of short, necklike extension of genital segment. First 

 segment, excluding winglike projections, 3 times as wide as long, 

 winglike extensions directed posteriorly, curving around and covering 

 lateral regions of second segment. Second segment slightly narrower 

 than first, length approximately five-eighths the width, lateral regions 

 convex, posterior end with distinct, concave anal depression. Caudal 

 rami (fig. 34c) flattened except for small, heavily sclerotized ridge 

 along proximal inner surface. Lateral margins flatly convex, inner 

 lightly plumose distally, posterior surface UTegular, with 4 plumose 

 setae, 1 plumose setule and 1 bluntly pointed spicule. 



Antennule (fig. 34a) 2-segmented, first segment approximately five 

 times the length of second, broad and flattened, distal third broadly 

 rounded although margin slightly wavy, bearing 20 subconical plumose 

 setules and 2 more elongate plumose setules. Second antennular 

 segment club-shaped, with 10 naked setules distally. Antenna (fig. 

 346) 3-segmented, situated posterior and medial to antennide base; 

 first segment broader proxunally than distally, with knob on proximal- 

 outer lateral surface, second segment narrow proximally, broad 



