ON SOME OSTRACODA, MOSTLY NEW, IN THE COLLECTION 

 OF THE UNITED STATES NATIONAL MUSEUM. 



By Richard W. Sharpe, 

 Department of Biology, Dewitt Clinton High School, New York City. 



Tho Ostracoda herein recorded are from collections made in the 

 Mississippi Valley in the States of Illinois, Wisconsin, and Nebraska, 

 from Massachusetts, and from Barbados, British West Indies. 



The specimens from Wisconsin were originally sent to the U. S. 

 National Museum for identification by Miss Eflie J. Rigden, of the 

 University of Wisconsin. They were collected from aquaria at the 

 university greenhouse, and the suspicion naturally arises that they 

 were introduced with some exotic water plants. 



The specimens from Nebraska were kindly sent to the writer for 

 identification and study by his friend, Prof. A. S. Pearse, of the 

 University of Michigan. Those from Barbados were recently sent 

 to the National Museum by the Imperial Department of Agriculture 

 for the West Indies, and were collected by the entomologist of the 

 department, Mr. Henry A. Ballon, on May 1. 1909. 



Genus CYPRIS O. F. Muller, 1792. 



Subgenus CYPRIS 0. F. Muller, 1792. 



CYPRIS (CYPRIS) GLOBULOSA, new species. 



Dimensions. — Length of female, 0.77 mm.; breadth, 0.58 nun.; 

 height, 0.52 mm. Male, unknown. 



Characters. — An unusually small member of this genus, very much 

 resembling Cypridopsis-\ike forms, not alone in size, but in shape. 

 Indeed, the individuals are so plump that instead of lying on their 

 side, as is so common among ( )stracods, t hey usually remain dorsal or 

 ventral side up. r riie shells of preserved specimens -how no especial 

 markings of any sort . 



Seen from the side (fig. la) the shell is two-thirds as high as long, 

 with the highest point in the middle: dorsal margin slightly humped; 

 ventral margin sinuate in the middle. Seen from above (fig. 1/') the 

 shell is broadly egg-shaped, but pointed anteriorly, where the right 

 shell overlaps the left; shell sparsely hairy, with the greatest 



Proceedings U. S. National Museum, Vol. 38— No. 1750. 



335 



