NO. 1750. 



ON SOME OSTRACODA, MOSTLY W'U sll VRPE. 



337 



gin, except a small portion at the middle, being armed with a row 

 of about sixty tuberculiform teeth, which are more prominently 

 shown postero-ventrally ; left valve with smooth margins (fig. 26); 

 ventral margin slightly flanged at the middle, and with a much nar- 



Fig. 2.— Cypris (Cyprinotus) dentata. a. left shell of female, X60; h, left 



SHELLOFMALE, <60; C, RIGHT SHELL OF MALE, <C0; d, DORSAL VIEW OF MALE, GO. 



rower growing line than the right; viewed dorsally (fig. '2d) the 



left valve overlaps the right both anteriorly and posteriorly 1 



abruptly narrowed anteriorly but yet rather blunt at the extreme 



tip; spines of the first maxillary process strong, blunt, and toothed: 



natatory seta 1 of the second antenme simple, the longer reaching 



well beyond tips of the terminal claws: 



terminal claw of the second leg (fig. 36) 



slender, decidedly curved, slightly longer 



than the width of terminal segment , and 



faintly toothed; maxillary palps of the 



male stout and decidedly hooked, as in 



figures 3 c, </; ductus in sac, and of 



about twenty-six whorls of spines; 



penis dig. Be) triangular, and with a 



boot-shaped branch; furca (fig. 3a) 



about sixteen times as long as wide, 



slightly curved, and about twice as long 



as the terminal (daw; both (daws nearly 



smooth, slightly curved, the shorter 



two-thirds the length of the longer, 



and situated about the width of the 



ramus from it; terminal seta slender. 



about four-fifths length of dorsal one. 



which is situated about width of ramus from subterminal claw , and 



is one-half its length. 



Remarks.- -The specimens were collected by Prof. A. S. Pearse, of 

 the University of Michigan, in a small pond near Stamford, Nebraska, 

 Proc.N.M.vol.38 in 



i i,,. 3. ri pRi Cyprinotus) dentata, 



a, Fl i:< \. 105; l>. SECOND LEG, ■ 250; 

 M \ XILLARY PALP OF M U.E, ■ 130; </. 

 \i \ XILLAR1 I'M. I' OF \l VLi:, ■ 130; I . 

 l'l MS. 



