NO. 1347. FRESH-WATER OSTRACODA—SHARPE. <».S9 



Shell alnio.st .smooth, with the exception of a f(>w small scattered papillar 

 elevations and anterior and posterior maroins with a frintre of sparsely 

 scattered long* hairs. 



Seen from above (fig-. 2) the shell is quite a uniform elonj^ate o\al, 

 anterior end narrowed somewhat, posterior cud rounded, ))roadest in 

 the middle. 



Seen from the side (%. 1) the shell is iiiohest about the middle, ven- 

 tral margin nearly straight, with a slight sinuosity at the middle. The 

 right valve of shell is slightly smaller that the left, its anterior mar- 

 gins armed wdtli a row of about twenty -five tuberculiform teeth (tig. 8). 

 The margin of the left valve has a rather wide hyaline Hange and a 

 row of scattered tubercles along the inner margin (fig. 4). 



Spines of the first maxillary process are toothed. Natatoi'v seta' of 

 the first antennae are plumose and reach well beyond the tei'minal claws. 



Terminal claws three and one-half times as long as the terminal seg- 

 ment. Sense club large, about five-sixths as long as width of segment 

 at its point of attachment. 



Furca rather stout, slightly bent, about twice as long as terminal 

 claw. Shorter claw about three-fourths as long as the longer. Dor- 

 sal seta width of furca from subterminal claw, bent, somewhat ])lu- 

 mose, and as long as subterminal claw; terminal seta tliree-tiftlis us 

 long- as dorsal one. 



Collected by Dr. E. Palmer from a trough fed by a spring llowing 

 from a butte near Big Butte Station, Idaho, in September, 181>8, and 

 now in the collection of the U. S. National Museum (Accession No. 

 27409); also collected at Guanajuato, Mexico, by Dr. .Vlfredo Duges, 

 April, 1901, and sent to the U. S. National Museum: 



Quincy, Illinois, 1882, Havana, Illinois. 189.5, and Urbanu. Illinois, 



1895. 



This species was originally described as Cyprinotus- pellucuia, base(l 

 laro-ely on the marginal rows of tubercles on the valves, the manner of 

 propagation being uncertain, although the material on hand contamed 

 no males. The additional material now on hand contams no males, 

 and it is therefore listed under the subgenus Cypris, in accordan,-e 

 with the preceding synopsis. 



2. Subgenus CYPRINOTUS. 



a Dorsal seta of furca more than one-half length of subterminal claw. 



h Dorsal seta at least twice width of furca from sul.ter.nmal claw, l^'^-"''";^ ' j^^^ 



of second foot strongly curved - - >ncon,rue^.. Ra.ndohr. 



«« Dorsal seta of furca not m..re than one-half length ol s.il.teri.nual cla« . 

 b Dorsal seta width of furca from subtermnial claw. 



e Shell yellowish-brown, marked with bluish-black ^-^g' -^'""^^f ^ ^ ; 



sum and sides, hairy --.- / . s;i,.,rn.. 



CO Shell dirty brown, leathery inconsistency no -]-^^^Y' T^^J^^^^^ 



bb Dorsal seta twice width of furca from subterminal ^^- ^^^^^^ 



green, shell marked with contorte<l lines, most noticeably on cephahc vo- 1. >i 



of valves 



