6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Description. — Female cephalo thorax (fig. 2a) bell shaped, consist- 

 mg of cephalon, maxilliped-bearing, and first pedigeroiis segments. 

 Second pedigeroiis segment distinct from and slightly narrower than 

 cephalo thorax; third pedigeroiis segment distinct from and slightly 

 narrower than second; fom-th pedigerous segment distinct from and 

 slightly narrower than thu'd, broadly rounded posteriorly. Fifth 

 pedigerous segment approximately haK the width of fourth, anterior 

 end overhung by posterior end of fourth pedigerous segment. 

 Genital segment (fig. 2c) distinct from fifth pedigerous segment, lateral 

 margins convex; oviducal opening surrounded by series of small 

 sclerites. Remaining urosome segments 4 in number, each tapered 

 slightly, narrower and shorter than preceding segment. Caudal ramus 

 (fig. 2/) subrectangular, short, with 2 long and 3 short terminal setae. 



Male prosome (fig. 26) more ovoid than that of female, general 

 makeup otherwise similar. Urosome tapered, genital segment (fig. 

 2d) similar in shape to remaining 4 urosome segments although 

 larger. 



Female and male antennule (fig. 2%) 5- or 6-segmented, proximal 

 segment expanded on proximal posterior surface. Female and male 

 antenna (figs. 2l, m) uniramous, 3-segmented, situated posterior and 

 slightly lateral to antennule base; first segment approximately one 

 and one-half times the length of second, both segments without arma- 

 ture. Thu'd segment elongate, length slightly less than that of first 

 segment, proximal portion with folded, flaplike extension with dentic- 

 ulations, naked seta and large, spinelike projection distally (fig. 2m) 

 Distal end of third segment with 1 naked seta and 4 clawlike spines. 



Female and male mandible (fig. 2j) rodhke, 2-parted. Fkst part 

 tapered slightly from proximal to distal end, second part tapered to 

 pointed distal end, curved inward slightly distally. Female and 

 male with Y-shaped postantennal process on anterior ventral surface 

 (fig. 2i), arms of Y with 9-10 transverse rows of spinules giving 

 brushlike appearance. Female and male maxillule (fig. 2j) situated 

 immediately posterior to mandible base, consisting of pair of setae 

 attached to platehke area of heavy sclerotization contiguous with 

 posterior edge of platelike area of heavy sclerotization forming attach- 

 ment surface for mandible. Maxilla (fig. 2k) represented by large. 



Figure 2. — Pseudotaeniacanthuspuhi,ne.vi%^&dQ%,doxs,a\ view: a, female; b, male. Fifth 

 pedigerous segment, fifth leg, genital segment, sixth leg, and first abdominal segment: c, fe- 

 male; d, male, same, also includes anterior end of fiist abdominal segment. Right fifth 

 leg: e, posterior view. Ventral view: /, caudal ramus; g, female cephalothorax (mdbl= 

 mandible, mxpd = maxilliped); h, male cephalothorax (mxpd = maxilliped); i, right antennule 

 and heavily sclerotized postantennal process; ;', right mandible (mdbl), maxillule (ma-1), 

 and paragnath (pg); k, maxilla; /, antenna; m, projection on proximal portion of third 

 segment of antenna. 



