384 PROCEEDINGS OF THE NATIONAL MUSEUM vol.90 



similar also to that of the second legs, but only three to four small 

 setae on the outer sides of the podomeres and long plumose seta at 

 the distal inner angle of the second podomere lacking. 



Fourth basipod like the second ; both rami of fourth legs with three 

 podomeres; exopod about twice as long as the endopod with three 

 similar podomeres; a stout pectinate seta at the distal outer angle of 

 each podomere, proximal to which there is a row of three or four 

 minute setae ; no setae on the inner sides of the podomeres ; four ter- 

 minal setae in a row, the two inner ones plumose and greatly elon- 

 gated, the two outer ones short and pectinate. Endopod with the 

 first two podomeres shorter than the third ; the inner distal angles of 

 the first and third podomeres with a plumose seta; on the outer side 

 of the first podomere one minute seta, of the second, two, and of the 

 third, five ; four terminal setae, the middle two longer than the endo- 

 pod and plumose, the outer and inner setae half as long and pectinate. 



Fifth legs (fig. 18, j) uniramose, lamellar, with two podomeres, 

 the basal one with a single seta on the outer side and expanded on 

 the inner side into a broad lamina terminated by a row of five setae; 

 the plumose outer two of these are, respectively, about two and four 

 times the lengths of the inner three, which in turn are about as long 

 as the inner expansion of the podomere; distal podomere stout, longer 

 than wide, with five setae terminally; innermost plumose seta over 

 three times the length of the podomere; outer four setae only one- 

 third or less the length of the innermost. 



All females observed had single ovisacs attached, containing 2 to 

 11 eggs (measuring TO/x by 60/x) in a single layer. 



Measurements based on 10 females are as follows: Total length, 

 exclusive of setae, 0.626 mm. (0.586-0.659 mm.) ; greatest width (first 

 thoracic segment), 0.131 mm. (0.091-0.158 mm.) ; length of anal setae, 

 0.476 mm. (0.428-0.500 mm.). 



Color in preserved specimens a transparent white, with the ovaries 

 and digestive tract a little darker. 



Male. — General body form similar to that of the female. Length 

 of body a little less, the anal setae, though of about the same size 

 as in the female, relatively longer, about four-fifths of the body 

 length. Setae on the thorax similar to those in the female. On the 

 abdominal segments 1, "2, and 3 a pair of small setae on the dorsum 

 and a lateral and ventral transverse row of still more minute setae 

 in the posterior part of the segment; terminal segment and anal 

 laminae with setae as in the female. 



Anterior antennae (fig. 18, a) with eight podomeres of different 

 sizes, joints more heavily chitinized than in the female, first two 

 podomeres equal, third shorter on the dorsal side, fourth largest, 

 rounded dorsally and concave ventrally, fifth shortest, rather indis- 



