North American Fresh-water Ostracoda. 427 



the female in that the terminal claw is armed with 

 three or four strong teeth at tip (PI. XL., Fig. 5). 

 The basal part of the penultimate segment has two cir- 

 cles of hairs, as has also the antepenultimate segment, 

 which is two sevenths the length of the penultimate. 

 *'Urticating seta" two-segmented, reaching to the middle 

 of the terminal spine; all the inner setae blunt and spiue- 

 like, as in L. reticvlata. 



IMaxillse and mandibles not especially different from 

 those of other members of the genus. 



Feet of first pair (PI. XXXIX., Fig. 11) shortest, armed 

 like those of the second. 



Basal segment of second pair faintly ciliated exteriorly 

 near the base; penultimate segment slightly longer than 

 the last, both together equaling the antepenultimate; 

 terminal claw nearly equal to three preceding segments, 

 and in male with two or three accessory teeth near the 

 tip (PI. XL., Fig. 3). 



Feet of third pair (PI. XL., Fig. 4) in the male 

 with an unusually long terminal seta, — as long as 

 the united segments of the foot, — faintly cross-striated 

 on its distal half, its place of attachment surrounded by 

 a circle of cilia, as is also the joint between the last and 

 penultimate segments; the last two segments together 

 equal to the antepenultimate, which has on its inner dis- 

 tal edge a plumose seta as long as the segment; basal seg- 

 ment somewhat triangular in shape, three times as long 

 as wide. 



Rudimentary caudal rami (PI. XXXIX., Fig. 12) cy- 

 lindrical, six to seven times as long as wide, gradually 

 tapering to a seta-like extremity which is five sevenths 

 as long as the main part of the ramus. Two dorsal 

 setae: one situated about the width of ramus from base 

 and as long as the width of the ramus; the other just 

 anterior to the seta-like termination, and about the same 

 length as the first. The male sexual grasping organs are 

 unusually well developed and as shown in PI. XL., 

 Fio-. 2. 



