978 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



Terminal claw nearly straight, rather stout, nearly smooth, and one- 

 half leng-th of furca. Su})terminal claw two-thirds length of terminal 

 one and straight. Terminal seta slender, six-tifths length of dorsal 

 one, which is two-thirds as long as subterminal claw. No males found 

 in the material at hand. 



Descril>ed from eighteen specimens sent to the United States Na- 

 tional Museum by Mr. J. D. Mitchell, Victoria, Texas. Collected by 

 Mr. Mitchell from a ditch on a rice farm on the west side of the 

 Guadalupe River, Victoria County, Texas, October, 1902; also pools 

 in the neighborhood of Vera Cruz. " 



This species differs from C. mexlcana in size, markings, form of 

 shell as seen from above, and ratio of length of furca to its breadth. 

 C. azteca is larger, much more wedge-shaped anteriorly as seen from 

 above, lacks the greenish stripes on shell, and furca stouter and shorter 

 as compared with width. 



6. HERPETOCYPRIS Brady and Norman, 1889. 



Erpctorii'prii< Brady and Norman, A Monog. of the marine and fresh-Avater 

 Ostracoda, Sec. I, Trans. Royal Dublin Soc, 1889, p. 84. 



Herpetocyprh Sars, Oversigt af Norges Crustaceer, Christ. Vid. Selsk. Forhd., 

 No. 1, 1890, p. 62. — Cronenberg, Beitrag zur Ostracoden-Fauna der Umge- 

 gend Moscou, Bull. Soc. Imp. d. Moscou, No. 3, 189-t. — Brady and Norman, 

 A Monog. of the marine and fresh-water Ostracoda, Pt. 2, Trans. Royal Dublin 

 Soc, 1896, p. 722. — Kaufmann, Zur Systematik der Cypriden, Mitteil. dor 

 Naturf. Gesell. in Bern, 1900, p. 105. 



Natatory setffi rudimentary; no swimmers. Spines of first maxillary 

 process plainh^ toothed. Length, 1.80 mm. or more. First segment 

 of first foot with two setae. Dorsal seta of furca very small. Sexual 

 or asexual. Three of the following species are reported from America: 



a Length about 4.00 mm. Furca al)out twenty times as long as wide. 



harlKitus (Forbes). 

 aa Length between 2.00 mm. and 8.00 mm. 



b Terminal claw of second foot at least three times as long as terminal segment, 

 c Natatory set» of second antennte nearly reaching tips of terminal claws. 



intermedia * Kaufmann. 

 cc Natatory set«3 of second antennpe not longer than the fourth segment. 



d Dorsal edge of furca with five combs of coarse teeth. Terminal claw of furca 



long and slender rcp1uu!< Baird. 



dd Dorsal edge of furca with seven combs of weak set;e. Terminal claw of 



furca short and stout brevicxtudaia* Kaufmann. 



bb Terminal claw of second foot about as long as last segment. 



c Caudal ramus about ten times as long as wide sty-igata* O. F. Muller. 



>T Caudal raiims aVmut seventeen times as long as wide peregr'ma* Kaufmann. 



ua<i Length l)et ween 1.00 mm. and 2.00 mm. " 



b "Furca with only terminal claws, lacking both terminal and dorsal setse"? 



ii)inne.toten.vs (Herrick ). 



«De Saussure, Mem. Soc. Phys. et Nat. (ieneve, 1858, p. 490. 



