LE BERT I A 3EFVEI WALTER. 377 



pair extending inwards for about three-fourths of the breadth. 

 The outer margins have two or three long hairs. The fourth 

 pair cover more than half the ventral surface and extend round 

 the sides well beyond the third pair. The genital area is enclosed 

 by them except for a narrow strip on the posterior median line. 

 The fourth pair have the posterior margin well rounded towards 

 the sides. 



The first pair of legs are about 0"5 mm. in length ; the second 

 pair 0"6 mm. ; the third pair 0*7 mm., and the fourth pair a little 

 over 1 mm. The second, third and fourth segments of the first 

 pair of legs have each one broad pectinated spine at the distal 

 end while in addition the second and third segments carry a few 

 short curved spines. The fourth and fifth have a few rudimen- 

 tary hairs. Bristles are apparently confined to the third and 

 fourth segments, which have one each distal. The first and 

 second segments of the second pair of legs have each one long 

 thin spine distaL The third and fourth segments have the distal 

 ends fringed with broad pectinated spines, the largest being on 

 the flexor surface. The fifth and sixth segments resemble those 

 of the first pair of legs. The first four segments of the third 

 pair of legs resemble those of the second pair, but with more 

 numerous spines. The first segment of the fourth pair of legs 

 has six or seven spines for the most part clustered at the distal 

 end of flexor surface, and where it articulates with the second 

 segment there are a few fine hairs. Distal spines of second and 

 third segments short and pectinated. The spines on all the 

 segments of the fourth pair of legs are relatively more slender 

 and straighter than on the other legs. The fifth segment has a 

 few fine spines and several fine hairs. Swimming hairs are either 

 wanting or of a very rudimentary character. 



As indicated above, the genital area is surrounded by the 

 fourth pair of epimera, except for a narrow strip. In outline it 

 is pyrif orm, with the usual anterior and posterior ridges for muscle 

 attachment, which, however, do not appear to be linked up to 

 the epimera. The posterior pair of acetabula are slightly smaller 

 than the other two pairs. Along the inner edge of each valve 

 there are about twenty hairs. 



The anus is surrounded by a strong ring and has on each side 

 a gland pore. 



A single specimen of which the sex cannot be determined was 



