44 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



posterior borders serrate. Plates widely separated. Genital segment 

 longer than wide (5.7 by 3.9 mm). Posterior corners of genital 

 segment produced and truncated. Abdomen 2-segmented. Each 

 segment bearing a dorsal plate. Plate of segment 1 bilobed. Plate 

 of segment 2 single. Caudal ramus large (1.6 by 0.8 mm) and bearing 

 6 short, naked spines. 



Oral area as in figure 198. Adhesion pads reduced. First antenna 

 (fig. 199) 2-segmented. First segment with 29 short, stout spines 

 (majority of the spines covered with spinules). Second segment with 

 14 naked setae. Second antenna (fig. 200) with a terminal claw 

 recurved at tip, with 2 short spines along outer edge. Small adhesion 

 areas on the penultimate segment. Mandible (fig. 201) of the usual 

 type with 11 teeth at tip (fig. 202). First maxilla (see fig. 201) a 

 broad lobe with a group of 3 setae near base and a broad terminal spine. 

 Second maxilla (fig. 202) with terminal claw subdivided into 2 seg- 

 ments (fig. 204). Terminal segment with short rows of fringe. 

 Penultimate segment with group of broad bladelike setae on inner 

 distal corner and surface of segment covered with stout setules. 

 Antepenultimate segment with large spine and patch of hairs at inner 

 distal corner. Maxilliped (fig. 205) with strong terminal claw. 



Legs 1-4 biramose. Spine and setal formula as follows : 



Leg 1 (fig. 206) with both rami 2-segmented. No adhesion pads on 

 the rami. Leg 2 (fig. 207) with each ramus 3-segmented. Outer 

 edge of first exopod segment striated as an adhesion area. Outer 

 edges of other exopod segments serrated. Leg 3 (fig. 208) with exopod 

 of only 2 clearly separated segments. Terminal segment shows some 

 evidence of being subdivided but indicates a fusion of last 2 segments. 

 Leg 4 with each ramus in shape of a broad lamella (see fig. 198). 

 Exopod bearing 4 short spines. Endopod unarmed. Leg 5 (see fig. 

 209) a single lobe with 1 small setae. Leg 6 (see fig. 219) located near 

 junction of abdomen and genital segment and composed of 2 spatulate 

 processes projecting under lateral extensions of first abdominal seg- 

 ment. Two sclerotized areas located on the midline of genital seg- 

 ment. These probably function in attachment of spermatophores. 



Egg strings long and folded (fig. 210) forming 3 strands. 



Color in life cream and without pigmentation. 



Male. — Body form as in figm-e 211. Total length 9.7 mm (based 

 on an average of 2 specimens). Greatest width 5.1 mm (measured 

 at the widest part of the cephalon). Cephalon about one-half body 



