48 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



with small, fan-shaped projection from outer margin at widest point 

 and 2 larger, frilled membranes more distally, 1 on inner surface, 

 second on outer. Second segment also with small roughened area on 

 distal outer surface, similar to that of adhesion surface; distal end 

 bearing 2 setalike terminal processes, innermost slightly less than 

 twice the length of outer, with fine membrane along outer and inner 

 margin, outermost with finely frilled membrane along outer margin. 



Female maxilliped (fig. 17e) 2-segmented, situated posterior and 

 slightly medial to maxilla base. First segment strongly developed, 

 narrow proximally and distally, broad medially, ^^dth pair of small, 

 shelflike projections on medial posterior surface. Second segment 

 short, distinct from clawlike terminal process, with setule-like acces- 

 sory process on inner surface, at junction of segment and terminal 

 process. Male maxilliped (fig. 17/) differing from that of female by 

 presence of large, lobate projection from proximal inner surface of 

 first segment, projection containing heavily sclerotized, clawlike proc- 

 ess; ridges on first segment not as distinct as in female. 



Female and male sternal furca (fig. 17 g) V-shaped, tines slender, 

 extending posteriorly over interpodal plate of first thoracic legs. 



For nature of legs and armature, see figures 18a-/ and table 8. 

 Small, platelike projection present immediately behind interpodal 

 plate of first thoracic legs, with minute nodules in immature adults, 

 similar to those of Euryphorus nordmanni Milne-Edwards. 



Description. — Immature adult. Female cephalo thorax (fig. 19a) 

 ovoid, consisting of cephalon and first 4 thoracic segments. Frontal 

 region approximately one-twelfth the total length of cephalothorax, 

 'SAdth median cleft and narrow membrane on anterior margin. Lateral 

 cephalothoracic margins convex, Avith membrane; mth distinct inden- 

 tation medially, indentation formed by folding of dorsal cuticle, ex- 

 tending inward to median cephalothoracic region. Posterior lateral 

 cephalothoracic region broadly rounded, terminating at junction Avith 

 median cephalothoracic region, forming outer surface of posterior sinus 

 (fig. 19c). Sinus irregularly U-shaped, outer margin with fine, irreg- 

 ular membrane. Posterior median cephalothoracic region not extend- 

 ing to end of posterior lateral cephalothoracic region, margin lobed 

 laterally, flat medially, distinct from anterior end of free fourth pedig- 

 erous segment. Major dorsal cephalothoracic grooves forming irregu- 

 lar H, anterior legs of H extending to just posterior to ocular region, 

 turning inward sharply. Ocular elements distinct. Dorsal cephalo- 

 thoracic surface Avith niunerous, elongate pliunosities arranged in 2 

 gTOups, one extending anteriorly, from just posterior to crossbar of 

 dorsal cephalothoracic grooves, to anterior region of longitudinal 

 grooves; second group, containing fewer plumosities, located on poste- 

 rior lateral cephalothoracic region. 



