226 U.S. NATIONAL MUSEUM BULLETIN 236 



antennular segments 1 and 2. Ventrally it is hollowed; the margin is 

 thickened. Thoracic somites 2 and 3 of nearly same length; 4th seg- 

 ment slightly shorter. Epimeral plates moderately developed, cut 

 off squarely at end. 



5th thoracic somite narrow but well visible in lateral and dorsal 

 aspects. Genital somite composed of fused abdominal somites 

 1 and 2, in dorsal aspect as long as combined lengths of abdominal 

 somites 3 and 4 (in the drawing of the lateral aspect a considerable 

 part of the genital somite is telescoped under the 5th thoracic somite). 

 Line of fusion between abdominal somites 1 and 2 obscure, but 

 laterodorsally marked by row of spinules. Spinules also occur on 

 sides of 3rd and 4th abdominal somites; the position can best be seen 

 from figures S>ld, 89a. Anal somite slightly longer than 4th abdominal 

 somite, spinules border insertion of furcal rami. Anal flap broadly 

 rounded, haired. 



Furca IK times as broad as long, with 5 marginal setae and 1 ap- 

 pendicular seta, and some scattered spinules along internal and 

 external margins. Setae 1, 4, 5, and appendicular seta of moderate 

 length, fine; setae 2 and 3 lengthened and thickened. 



Antennules (fig. 90/) 8-segmented, )i length of cephalic somite. 

 4th segment twice as long as broad, with small conical process bearing 

 aesthetasc and 2 setae. 



The antenna and mouth parts are the same as in the male and will 

 be described below. 



Leg 1 (fig. 90a) with 3-segmented exopodite and endopodite. 

 Coxa with spinulose external tubercles. Basis with slender external 

 spine and big internal spine; insertion of endopodite placed on a 

 socle bordered with spinules. Segments of exopodite of nearly same 

 length, 2nd without internal seta; 3rd with total of 4 appendages. 

 Endopodite styliform, longer than whole exopodite, with fine subapical, 

 internal seta, 2>%, times as long as wide. 2nd endopodal segment 

 small, with internal seta. 3rd endopodal segment 2^ times as long 

 as wide, with 2 very unequal, geniculate spines and fine seta at apex. 



Exopodites and endopodites of legs 2 to 4, 3-segmented ; the particu- 

 lars of these feet can be taken from figures 906-c? and from the setal 

 formula: 



Baso-endopodite of leg 5 (fig. 90e), both sides closely approaching 

 each other but not touching, each with 5 setae, innermost seta short. 

 Exopodite Iji times as long as wide, with 6 setae, 2 of which are 

 lengthened; external margin spinulose. 



Color completely faded, colorless, transparent. 



