NO. 1347. FRESH- WA TER OSTRA CODA-SI 1. 1 kl'E. \) 8 5 



Siniocyprir. G. W. Mui.ler, Zool. Anz., Xo. 653 1901. 



Amphicirpris Sars, Fresh-water Entonios^. of South Auicrica, Ardiiv. lur Matli 



ogNaturvid., XXIV, No. 1, 1901, p. 16. " 

 Neocypris Sars, Fresh-water Entomos. of Soutli Aiiierica, Ardiiv. for >hitli ...r 



Xaturvid., XXIY, No. 1, 1901, p. 29. • - • • r- 



Natatory .setiy reaching to tips of terminal claws or somewhat 

 beyond. 



Second antennae five -segmented in both ninU» and femak\ liciiiicliiiil 

 phite of six pkimose setaj. Terminal segment of second foot hcak- 

 shaped, with a toothed hook-shaped claw. Fnrca normal, willi (wo 

 claws and two setffi. 



Propagation sexual or asexual. Ductus, when present, of numerous 

 chitinous spines thickly crowded over entire surface of cylinder and 

 usually not in wreaths. I have tentatively divided this genus into the 

 five following groups, for reasons given in the introduction (p. ltt)I»: sec 

 Key, p. itTl). 



1. Sujjgenus CYPRIS. 



a Length between 1 mm. and 2 mm. 



h Both spines on first process of first maxilla smooth. 



<■ Terminal claw of second foot as long as terminal segment. 



(I Caudal ramus straight; subterminal claw two-thirds as loug as the ti-rmiual. 



Shell four-ninths as high as long clarata * liainl. 



dd Caudal ramus weakly S -shaped. 



e Subterminal claw of furca half as long as the terminal. Shell two-thirds 



as high as long rlrtiis Jurine. 



ee Subterminal claw of furca nearly as long as terminal. Shell one-half as 



high as long altissiinus Chambers. 



cc Terminal claw of second foot twice as long as terminal segment. Terminal claw 



of furca nearly as long as entire furca onuita * 0. F. Midler. 



hh Both spines on first process of first maxilla toothed. 

 c Shell not reticulated with broken lines. 



d Shell less than twice as longas high. Terminal claw of furca half as long a.s 

 furca. 

 e Subterminal claw of fnrca three-fourtiis as long as terminal, both smooth, 



jielluridd Sharpe. 



ee Subterminal claw two-thirds as long as the terminal fu.saita (Jurine). 



dd Shell more than twice as long as high. Terminal claw of furca one-thinl 

 as long as furca. Subterminal claw two-thirds as long as terminal. 



ti.'«'heri* Lilljeltorg. 

 cr Shell reticulated. Terminal claw of furca about three-fifths as long as ramus. 

 Terminal seta not more than one-fourth as long as terminal claw. 



rcliriddla Za<ldacli. 

 wi Length between 2 mm. and :! mm. Third and fourth segment.s of first foot fused. 



Shell spinous /'«'"•'■" < >• ^'- >^>''l^'''- 



aaa Length 3 mm. or more. 



b Both spines of maxillary process smooth. Dorsal margin of shell strongly r^n- 



vex, marked with dark bands h.rrirl.; Turner. 



hb Both spines of maxillary process toothed. Dorsal margin of sh<-ll nearly 

 straight, marked with dark bands p,rde(jim.-< Ilernck. 



