186 U.S. NATIONAL MUSEUM BULLETIN 236 



Antenna with allobasis and 2-segmented exopodite, bearing 2 and 4 

 setae on the segments. Setae and spines of endopodite normally 

 developed. 



Mouth parts not studied in detail; maxillipede without spines on 

 basis. 



Leg 1 with 2-segmented endopodite, 1st segment styliform, internal 

 seta attached above middle of segment. 2nd segment of exopodite 

 only slightly longer than 3rd, the latter with normally developed 

 setae and spines (fig. 68c). 



Legs 2 to 4 have the following setal formula: 



endopodite exopodite 



leg 2 1.1.121 1.1.123 



leg 3 1.1.221 0.1.323 



leg 4 1.1.221 0.1.323 



Exopodite of leg 5 rather slender, 2% times as long as wide, with 6 

 marginal setae, not differing from type described above. 



The specimen carries a ball composed of 3 remarkably large eggs. 



Adult male (from locality 590, corresponding Avith female described 

 above), total length 0.39 mm.; greatest diameter 0.05 mm.; length 

 longest f ureal seta 0.12 mm. 



Body, especially in dorsal view, at once striking by extreme slender- 

 ness and long, slender rostrum (fig. 666). Head and 1st thoracic 

 somite fused; cephalic somite with parallel sides, anteriorly slightly 

 tapering, suddenly contracted at basal parts of antennules. Poste- 

 riorly body tapers gradually; division between cephalothorax and 

 abdomen very weak. Division between thoracic somites distinctly 

 marked by constrictions, length of cephalic somite equal to combined 

 length of thoracic somites 2 to 4. Back in lateral view smoothly 

 rounded, gradually continuing into curved, slender rostrum, separated 

 from cephalic somite by shallow groove (fig. 66a). Rostrum slender, 

 as long as antennular segments 1 and 2, apex curved inward. Median 

 parts of distal margin of cephalic somite and thoracic somites 2 and 

 3 backwardly produced to form saddle, covering beginning of each 

 following somite. 4th thoracic somite distally cut off squarely. 



5th thoracic somite small, laterodorsally with row of spinules, 

 interrupted medially. Abdominal somites 2 and 3 of equal length; 

 1st (genital) somite slightly longer, 4th slightly shorter. Spinules 

 occur on genital somite (dorsally and laterally), 2nd and 3rd somites 

 (completely closed distal row), and on 4th somite (dorsally and 

 ventrally). Anal somite small, anal flap broadly rounded, nude. 

 Insertion of furcal rami bordered by spinules. Furcal rami with 

 usual 5 marginal setae and 1 appendicular seta. Setae 2 and 3 

 lengthened and thickened, not swollen at base. Seta 4 fine, not 

 spiniform. 



