338 



PROCEEDINGS OF THE VATIONAL MUSEUM. 



VOL. 38. 



on Augusl 2, 1902, and later kindly sent to the writer for study and 

 identifical ion. 



Type-locality. Fresh-water pools near Stamford, Nebraska. 



Type-specimt n. Cat. No. 39513, U.S.N.M. 



Genus CYPRIA Zenker, 1854. 



CYPRIA OBESA Sharpe. 



Cypria obesa Sharpe, Bull. 111. State Lab. Nat. Hist., vol. 4, art. L5, L897, 

 p. 162, pi. 48, figs. 1-5. 



Dimensions. — Average length 0.58 mm.; average height 0.3 mm. 

 Fresh-water representatives of this species slightly larger. 



Remarks. The color of brackish water forms varies from a light 

 transparent brown to a reddish brown. The reddish tint may be due 

 to the fact that they are closely associated with, and feed upon, a red- 

 dish alga common 

 in the localities in 

 which this smaller 

 reddish variety is 

 found. Penis as in 

 fio;. 4d. Tn all other 

 respects, except inn; 

 size and color this 

 form agrees per- 

 fectly with ('. obesa. 

 1 am therefore des- 

 ignating it by this 

 name, rather than 

 adding a varietal 

 name, as it is well 

 known that mosl 

 Entomostraca vary in accordance with the seasons and differences 

 in character of habitat . 



Remarks. This is the only Ostracod of the brackish ponds in the 

 vicinity of Woods Hole, Massachusetts, which i- also found in fresh 

 water. It occurs abundantly, and is associated with the reddish 

 algae of such ponds during July ami August. 



Brady -peaks of other members of this <vnns as being found in 

 the brackish waters of the British coasts. He also mentions Cyclo- 

 cypris (Cypria) hevis as common "in fresh and brackish water-."' 

 As ' hevis is to he found in all sort- of stagnant and foul waters, 

 it i- not -u rpr i-iiiLf that it should be found in waters that are quite 

 brackish. 



l'n.. (.--Cypria obesa. a, right shell from within, X"0; 6, 



IT MAXILLARY PALP OF MALI ; c. SECOND FOOT, X210; (/, PEN1 . 



Brady and Norman, Monogr. of marine ami fresh-water Ostracoda, Sci. Trans, 

 j Dublin Soc, vol. I, L889. p I 



