16 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Female. — ^Body form as iii figure 5. Total length 9.7 mm. Great- 

 est width 1.5 mm. Cephalon as mde as long (1.3 mm), widest near 

 posterior border. Thoracic segments bearing legs 1-4 free. Segment 

 bearing leg 1 with well-developed aciculum, 1.3 mm in length, bifid 

 at tip. Thoracic segments 6 and 7 fused to form genital segment. 

 Genital segment long, comprising slightly more than one-half body 

 length. Abdomen 2-segmented. Terminal segment wdth posterior 

 sclerotized ring at point of attachment of caudal rami (see fig. 43). 

 Caudal rami (fig. 43) 3 times as long as wide (264pt by 94/i). Each 

 ramus fringed along inner margin, bearing 4 terminal and 2 sub- 

 terminal setae. Outer 2 terminal setae stout, plumose on mner 

 margins only. 



Oral area as in other members of genus. First antenna (fig. 44) 

 7-segmented, each segment with short, naked setae as in the figure. 

 Second antenna (fig. 45) chelate. Movable process with short spine 

 on mner margin, tips of immovable and movable processes pointed. 

 Mouth tube short. Labrum with lateral spinose lobes. Mandible in 

 form of stylet. First maxilla biramose. Second maxilla (fig. 47) 

 with short, bhmt claw at tip. Maxilliped (fig. 48) with long re- 

 curved claw. Maxilliped most prominent appendage of cephalon. 



Legs 1-4 biramose; each ramus 3-segmented. Spine and setal 

 formula as follows: 



Leg 1 (fig. 49) exopod with fringe on outer margm of all 3 segments. 

 Outer margin of last 2 endopod segments with row of many short 

 spmes. Legs 2 (fig. 50) and 3 (fig. 51) rami with outer margins armed 

 as leg 1. Leg 4 (fig. 52) exopod with fringe on first segment only. 

 Endopod outer margin as in preceding legs. Each corner of intercoxal 

 plate of legs 2-4 with well-developed, posteriorly directed spine. 

 Corners of intercoxal plate of leg 1 with knobs. Leg 5 represented by 

 4 setae located on margin near middle of genital segment. Setae 

 arranged in 2 groups of 2 setae each. Leg 6 a single seta at posterior 

 corner of genital segment. 



Egg strings uniseriate. 



Male. — Body form and appendages like those of female. Total 

 length 4.4 mm. Greatest width 1.0 mm. Male differs from female 

 in form of genital segment, abdomen, and caudal rami (fig. 53). 

 Abdomen 3-segmented, end of abdomen not sclerotized as m female. 

 Caudal rami nearly 6 times as long as wide (352/i by 6lAt). 



