no.1750. ON SOME OSTRACODA, MOSTLY VEW—SHARPE. 



339 



Occurrence. — Found abundantly in all the brackish ponds in the 

 vicinity of Woods Hole, and at Xaushon Island, Massachusetts 

 during July and August. 



Distribution. — Small sandy lakes, Havana, Illinois, May to August, 

 (Sharpe). Ponds at Jackson Park, Chicago, May. 



Genus CHLAM YDOTHEC A Saussure, 1858. 



CHLAMYDOTHECA BARBADENSIS, new species. 



Dimensions. — Male, length 3.4 mm., heighl 1.6 mm.: female, 

 length 3.8 mm., height 1.8 mm. 



Fl(.. .".. CHLAMYDOTHECA BARBADENSIS. 0, RAKE-LIKE ORGANS OF MOUTH, 

 X140; b, LEFT SHELL <>F MALI . 20; C, RIGHT SHELL OF FEMALE, X20| (I. 

 SPINES OF FIRST MAXILLARY PROCESS, • 120; e, FIRS! II',. 70; f, TERMINAL 

 SEGMENT OF SECOND LEG, ■ 70; ff, h, MAXILLARY PALPS OF MALE, 80; i,PENIS, 



■ iill; /, ii i:, ». i,ii. 



Characters. Viewed laterally (fig. 56) the shell of the male is aboul 

 three-fifths as high as long. The greatest height is in the anterior 

 third, just back of the eye spot, from which the dorsal margin 

 slopes rapidly posteriorly; ventral margin nearly straight; shells of 

 alcoholic specimens with no especial indications of color markings, 

 and quite pellucid, showing the internal organs quite plainly; 

 shells of both male and female showing the anterior flanges SO 

 characteristic of the genus; shell of the female (fig. 5c) nol quite so 



