78 REPORT OF NEW JERSEY STATE MUSEUM. 



twice as long as terminal one and armed with two setae in 

 its inner edge and outer margin of segment with three combs 

 of minute teeth. Sometimes terminal claw weakly sigmoid, 

 likely of younger stages of growth. Furca stout, nearly straight, 

 one-sixth wide as long measured along anterior edge, and ter- 

 minal seta varying from one-half to two-thirds length of terminal 

 claw. Terminal claw stout, slightly curved near tip, toothed 

 near tip and about one-half length of ramus measured along 

 anterior margin. Subterminal claw also slightly curved near 

 tip, toothed, but little shorter than terminal claw. Dorsal seta 

 hardly distinguishable and usually wanting. Length 0.45 to 0.48 

 mm. ; breadth 0.24 to 0.28 mm. ; height 0.3 to 0.34 mm. Rather 

 common in ponds and swamps southeast of Chicago, Illinois, 

 and at Clarke Junction, Indiana. (Sharpe.) 



Remarks. — This species is world-wide in its distribution, and 

 is said to be somewhat variable. It has been once recorded from 

 New Jersey. Fossils are also known from the English Tertiary. 



Genus CYPRIA Zenkei*. 



Cypria Zenker, Arch. Naturg., XX, 1854, p. 77. Type Cypris punctata (nee. 

 Jurine) Zenker, first species (=zCypris inscidpta Rischer), designated by 

 Norman and Brady, Tr. Roy. Dublin Soc, (2) IV, 1889, p. 68. 



Physocypria Sharpe, Proc. U. S. Nat. Mus., XXVI, 1903, pp. 993, 994- Type 

 Cypria piistulosa Sharpe, first species. 



Second antennas of female five- jointed, of male six-jointed. 

 Distal end of fourth joint of second antennae bears two olfactory 

 setae. Natatory setae of second antennae extend far beyond tips 

 of terminal claws. Mandibular palp much elongated. Palp of 

 first maxilla strongly developed. Second maxilla bears well- 

 developed branchial plate. Palp of second maxilla un jointed and 

 ends in three setae in femiale. In male it formis hooked prehensile 

 organ, and right and left palp dissimilar. Caudal rami robust, 

 and dorsal setae situated about midway of outer border. Eye 

 large. Muscle impressions four. Center of Zenker's organ sur- 

 rounded by seven whorls of chitinous setae. Upper part of 

 organ forms blind sac, and lower ends in funnel-shaped origin 

 of vas deferens. Copulatory organ triangular. Males numerous. 



