NO. 3580 OSTRACOD FAMILIES — KORNICKER 17 



with convex dorsal and ventral margins; surface smooth or with 

 complex ornamentation; anterior with rostrum and shallow-to-deep 

 antennal sinus; posterior rounded or with process; lamellar prolonga- 

 tion of selvage with fringe of hairs. 



First antenna: First joint without bristles; 2nd joint with 1 disto- 

 lateral bristle, 1 distodorsal bristle, and usually 1 disto ventral bristle; 

 3rd joint with 1 ventral and 1-4 dorsal bristles; 4th joint with 1-4 

 distoventral and 1-2 distodorsal bristles; 5th joint of male consider- 

 ably reduced but always represented ventraUy by a sensory bristle 

 broadening proximally and with numerous long filaments; 5th joint 

 of female not reduced, and with a stout distoventral bristle with short 

 filaments; 6th joint of male not reduced, and with a slender disto- 

 medial bristle; 6th joint of female considerably reduced but always 

 with a slender distomedial bristle; 7th joint reduced, and with 1 short 

 distodorsal bristle, 1 long distomedial bristle with short filaments, 

 and 1 long distoventral bristle with filaments (a-, b-, and c-bristles 

 respectively); 8th joint reduced and with 2 long bare distolateral 

 bristles (d- and e-bristles), and 2 long distomedial bristles with 

 filaments (f- and g-bristles) ; c- and f-bristles on male extremely long, 

 about length of shell. 



Second antenna: Endopodite of male with 3 joints, each jomt 

 with 2 or more bristles; endopodite of female with 1-3 joints having 

 total of 6 or more bristles. Exopodite: 3rd joint of male at least 

 twice length of 2nd joint; in female joints decreasing in length distaUy; 

 joints usually with basal spmes; 2nd to 8th joints each with 1 bristle; 

 9th joint usually with 6-7 bristles. 



Mandible: Coxale in female large, bifurcate at tip, in male reduced 

 or absent. Basale with 5-9 ventral bristles, 1-4 dorsal bristles, and 

 5-6 medial bristles. Exopodite elongate with 2 terminal bristles. 

 Endopodite: 1st joint with 4-7 ventral bristles; 2nd joint with 5 or 

 more dorsal bristles and ventraUy at least 1, but usuaUy about 6 

 bristles. End joint with 2-3 claws and 3-4 bristles. ^ 



Maxilla: Endites 3 in number; exopodite elongate with 3 bristles; 

 maxilla on female usually larger than on male. 



Fifth Ihnb: Exopodite: 1st jomt of female Avith 2 or more strong 

 teeth; 2nd joint of female forming large squarish sclerotized process 

 having large inward projecting tooth distaUy and an inner margin 

 either smooth or with small nodes or 2 large teeth; 1st and 2nd ]omts 

 of male without stout teeth; 3rd jomt with 3 bristles on mner lobe 

 and 2 on outer lobe; 4th joint elongate with 5-6 bristles. Endites 3 

 in number with a varying number of bristles. Epipodial appendage 

 with numerous bristles (more than 30). , • i o ^ 



Sixth Ihnb: Endites 4 in number; end jomt with 9-45 bristles; 2-4 

 bristles in place of epipodial appendage. 



226-965—67 3 



