214 U.S. NATIONAL MUSEUM BULLETIN 23 6 



Legs 2 to 4 as in the adult feuiale stage; the setal formula is: 



endopodile exopodite 



leg 2 1.1.121 1.1.223 



leg 3 1.2.321 1.1.323 



leg 4 1.1.221 1.1.323 



5th legs with setation and shape of adult female stage, but without 

 rows of fuie spinules that are found on posterior and anterior aspect. 

 Separation between baso-endopodite and exopodite incomplete, but 

 future line of articulation already mdicated. Development of spinules 

 can best be judged from figure 86c. 2 setae on small lobe at end of 

 each side of 1st abdominal somite, representing armature of genital 

 plates. In spite of these setae, which suggest the condition in the 

 adult male, I think this specimen is an immature female because of 

 the structure of antennules and endopodite of leg 2 (fig. 8Qd). 



Adult male, total length 0.86 mm.; greatest diameter 0.24 mm.; 

 length of longest furcal seta 0.67 mm. 



General shape of body moderately slender, especially in dorsal 

 aspect, where greatest diameter is at 2nd thoracic somite (fig. 82a). 

 Anterior part of body narrowing and more or less conical; posterior 

 parts also narrowing, with separation between cephalothorax and 

 abdomen indistinct. Back, in lateral view, curved; head separated 

 from rostrum by shallow groove (fig. 826). Rostrum heavy, tri- 

 angular, curving downward and forward, a very prominent feature in 

 dorsal aspect, as long as first two antennular segments; apex rounded. 



Head and 1st thoracic somite fused to form cephalic somite, in 

 length equal to combined lengths of thoracic somites 2 to 4. Laterally 

 the cephalic somite is moderately produced to cover basal parts of 

 oral appendages; posterolateral corner backwardly produced. 

 Epimeral plates of thoracic somites 2 to 4 rounded, slightly back- 

 wardly produced. 



5th thoracic somite small, visible both in lateral and dorsal aspects. 

 Genital (1st abdominal) somite large, slightly broader than long, 

 about lYi times length of 2nd or 3rd abdominal somites, which have 

 same length. 4th abdominal somite short, as long as anal somite. 

 All abdominal somites are strongly set with spinules; in addition to 

 a completely closed row of spinules at the distal end of each somite 

 there are oblique rows on the sides, the position of which appears 

 clearly from figure 826. Anal somite with bluntly pointed anal oper- 

 culum and lateral row of spinules; in addition, spinules border in- 

 sertion of furca on anal somite. 



Furcal rami slightly broader than long (proportion 5:4). 5 

 marginal setae and 1 appendicular seta on each ramus. Moreover, 

 each ramus has a strong spine placed between setae 4 and 5, and some 

 dispersed spinules along the internal border. Appendicular seta 



