THE WATER FLEAS (CLADOCERA) 

 96 (99) Hepatic ceca present; post-abdomen bilobed- 



-0-1-3 

 1-1-3 



antennary scUi- 



97 (98) Post-abdomen very large, with few spines. . Grimaldina Richard ,89. 

 ^^^^ ^P^'^^^ GrimaUina hn.zzai Richard i8g.. 



Fig. 1 106. Grimaldina brazzai. 



Body comprcs.scd. somewhat /mad- 

 ran^ular. with all m.i': ' Uc* 



slightly convex. I'om .,„. 



mous. much (omprcsv ; .^\. 



elliptical in form; the pre aiul i-^rtioo 

 nivKJed |jy a notch into two jartv ol 

 which the anterior is the smallrr"- a 

 lonK spine in the notch which maris 

 junction of anal and pre anal (wrt* on 

 anal part two lateral rows of Miulj. 

 slender spines. aU)ut 7 in anterior.' 

 and 5 in rxjslerior row. Claws wnaJI 

 denticulate, with i .small hasal spine! 

 Ephippium roundtnl (j u a d r a n r u I a r: 

 CRR-chamhers rcniform with concave 

 sides toward each other. ^ (.South 

 America) small, like immature 9; an- 

 tennuleswith 2 ba.sal sense hairs; small 

 hook on first foot. Color rcrfdish- 

 brown. Length, 9 to og mm ; ^J . 

 0.5 mm. Louisiana; weedy prwb of 

 dear water. 



98 (97) Post-abdomen moderate; numerous small spines on prc-anal part. 



clusters of hairs on anal part. . . Whissicsid Daday iqov 



Sole American species Wlassicsia kinistimnsis Ww^i.- \gio 



Form ovaJ, not com- 

 pressed. Valves crrsled; 

 with spines on ventral mar- 

 gin; market! by vcr>- deli- 

 cate transverse striae which 

 anastomose, forminj: hne 

 vertical meslies Olfactory 

 setae subeijual. Two 

 rounde<| projct lions at base 

 of labrum on ventral sur- 

 face t>f heati. I^brum with 

 strong tonical projection 

 l^ointin^' backwanl and a 

 second f^rojcition just in 

 front of small terminal 

 lolx.'. I'ost aUlomcn with 

 line spines and hair> .\b- 

 dominal set .le ver>- lon^. not 

 set on projection Claws 

 with V e r >' small basal 

 spines live jwiirs of feet; 

 branchial sacs on all le«r&> 



$ with large antennule; small keel on labrum; hook on first foot. Color yellow. Ixnicih, 



9, 0.8 mm.; ^,0.4 mm. Marsh at Kinistino. Manitoba. 



Fig. 1107. Wlassicsia kinistinemis. 



99 (96) No hepatic ceca; post -abdomen various. 



