NO. 1347. FREm- WA TER OSTRA CODA-SIL I lil'K c) 7 3 



gg Furca abnormal, "terminal seta missing. "(•') 



1, fexual. Length,3.00mn..ormore..:...;subgen«8««».,«e./,.J. 

 aaaa Natatory setie usually long. Second foot usuallv beak-shaped at ti,, with •, 

 claw. Furca rudimentary, with a lash-Hke end bristle. 



Subfamily CYPKinoi-siN- v \\ 

 h Furca with no dorsal seta, lamellar and ending in a long bristle. 

 (• Shell irregularly sculptured and roughly tubercled. Fin^t fuf.t -J-,..- 

 mented. End segment of second foot not beak-shaped, but small ami 



conical ,. ■ 1,. 



'fiiron/jiriK, 1 1(. 



hl> t urea usually with dorsal seta, or at least with 2 end set;e. 



r Natatory sette normal, or at least reaching to middle of terminal claws. 

 <1 Shell covered with prominent concentric lines. Second anteniuti of sexes 



different Zmon,prl.,'20. 



dd Shell plain, at least no concentric lines or bands. 



e Shell broad from above, tumid. Branchial plate of from 2 to .") j)lniu(.se 



setse. Parthenogenetic dfpndojmx, 21. 



ee Shell rather narrow from above. Second antennae usually 4-seg- 

 mented. Branchial plate of not more than 2 setie. Sexual or 



asexual Potanioci/prU, 22. 



cc Natatory setje very rudimentary, not adapted for swimming. 



Paracypridopfiis, 23. 

 aaaaa Natatory setse very long, usually twice as long as distance from their origin 

 to tips of end claws. Second feet with 3 seta^ 1 long, the other 2 ratlu r 

 short and backwardly directed. Furca usually normal. 



Subfamily Cvci,o('VPKiniN.K, V. 

 b Natatory sette reaching well beyond end-claws. 



e Terminal segment of second foot small. Ductus of circlets of spine-like 

 setie, and a distinct central axis. Fourth segment of second antenna of 



male with 2 sense organs Q/pria, 24. 



d V^alves of shell of about same size. Right valve margin not usually 



crenulate Subgenus Cgpria, 1. 



dd Valves of shell of decidedly different sizes. Terminal margins of right 



shell crenulate Subgenus I^hgifoqipria, 2. 



cc Terminal segment of second foot long and narrow, three times as long 

 as broad. Ductus of numerous long filaments; no distinct central axis. 

 Fourth segment of second antenna of male with no sense organ on distal 



end Ct/cloci/prls^ -"1. 



hh Natatory setie reaching but to tips of end-claws or slightly beyond. 



c Furca with 2 small dorsal set*. Shell smooth PontoparUt, 2H. 



cc Furca normal. Shell tubercled or furrowed in region of eyes, resend>ling 



marine forms or Lbiinicythere I- ;/"<7//j/"(-">', 2 < . 



aaiiaad. Natatory set* entire lacking, or little developed. Second antenna' 0: 

 female 5-segmented; of male mostly 6-segmented, and with 2 sense clubs. 

 Terminal segment of second foot with 3 unlike seta', 2 of whii-ii are back- 

 wardly directed Subfamily Candomn.k, VI. 



h Shell not reticulated or honeycombed. 



c Natatory seta of first antenna longer than entire antenna. I'enultiiuate 

 segment of second foot of 2 fused segments; foot therefore 4-segmente.l. 



Furca normal Cn/plocandoua, 28. 



cc Natatory seta of first antenna shorter than antenna. Second antenna 

 6-segmented in male and 5-segmented in female. 

 d Furca normal. Branchial plate of 2 seta\ Eye present, small. 



Cdiidoiitt, 2!1. 



