

PROCEEDINGS OF THE VATIONAL MUSEUM. 



vol. 38. 



breadth just posterior to the middle; natatory setae of the second 

 antennae reaching well beyond tips of terminal claws: the two spines 

 of the firsl maxillary process stoul and toothed; terminal segment 

 of second fool beak-shaped (fig. id), and bearing a large hook-shaped 

 spine, and a seta which is about two and a half times the length of 

 the spine; terminal claw of first fool about as long as rest of foot: 

 caudal ramus smooth (fig. I c), long and slender, and about eighteen 

 times as long as wide: terminal claw very long and seta-like, fully 

 three-fourths as long ;is the ramus; subterminal claw about one-half 

 as long as terminal one. and also very slender and seta-like: terminal 

 seta weak, scarcely evident; dorsal seta aboul one-third length of 

 subterminal claw, and situated aboul t he width of the ramus from it. 

 Remarks. A number of specimens of this interesting Cypris were 

 sent to the l'. S. National Museum for identification by .Miss Effie J. 



Rigden, of the Universityof 

 Wisconsin. She had been 

 studying their light reac- 

 tions. Speaking of their 

 habitat she says: "The 

 Ostracods whose habitat 

 you wish to know were 

 taken from a tub in the 

 greenhouse at the Univer- 

 sity of Wisconsin. They 

 have been living there all 

 winter. T have not found 

 them elsewhere. The tub 

 is kept filled with fresh 



Fig. 1. -Cypris (Cypris) globulus, a, right shell from Water, and contains Several 



— — -• xao;* W ater plants, and a great 



deal of Vauch( ria, in which 

 the ( tetracods are generally found. I have been able to keep them for 

 weeks in a jar in which I have placed some of the Vauclieria." 

 Type-locality. — Madison, Wisconsin. 

 Type-specimen. -Cat. No. 3951 I. U.S.N.M. 



Subgenus CYPRINOTUS Brady. 1886. 

 CYPRIS (CYPRINOTUS) DENTATA, new species. 



Dimensions. Length, 1.3 to 1.4 mm,; height, 0.5 to 0.65 mm; 

 breadth, 0.5 to 0.58 mm. 



Characters. Preserved specimens show no especial shell markings, 

 and are yellowish, transparent, and smooth. 



ii from the side (fig. 2a) the shell margins are nearly parallel, 

 the posterior ext remit y being more acutely pointed than the anterior. 

 Righl valve (fig. 2c), somewhat smaller than the left, it.- entire mar- 



