826 



FRESH-WATER BIOLOGY 



(no) 



Both claws of furca not S-shaped — gently curved (Fig. 1299 a). 



Candona recticaiida Sharpe 1897. 



Male 1. 18 mm. long, 0.70 

 mm. wide. Shell curved with 

 scattered papillar elevations. 

 The spermatogonia show 

 through as four bands. Sec- 

 ond leg six-segmented. Furca 

 straight, about thirteen times 

 as long as wide, with a dorsal 

 sinus base of furca very broad. 

 Right maxillary palp of male 

 club-shaped (Fig. i3ooif). Bot- 

 tom of ponds; February. Illi- 

 nois. 



Fig. 1299. 

 Candana recticaiida. (a) Furca; 

 (6) Second leg; (c) End of second 

 antenna; (if) Right maxillary 

 palp of male; (e) Left maxillary 

 palp of male. 



112 (113) Second leg six-segmented 114 



113 (112) Second leg less than six-segmented 116 



114 (115) Shell with fine longitudinal striations when in glycerin. Max- 

 illary palps of male enormously thickened, their fingers fully 

 as thick as the stem (Fig. 1300 d). 



Candona fahaeformis Fischer 1854. 



Length i.oo to 1.26 mm., height 

 0.47 to 0.50 mm., width 0.49 to 0.51 

 mm. Shell yellowish transparent, 

 strongly compressed, the left valve 

 overlapping the right at both ex- 

 tremities, and also with dorsal 

 flanges. Furca ten times as long 

 as wide, straight. Abundant in 

 small pools in March, April, and 

 September. Georgia, Ilhnois. 



Fig. 1300. 

 Candona fahaeformis. (o) Side view of 

 male, X 30; (6) Sideview of female, 

 X 30; (c) Furca; (d) Right max- 

 illary palp of male, X 75. 



£15 (114) Shell without fine longitudinal striations. Maxillary palp of male 

 with finger about one-half as thick as stem (Fig. 1301 c). 



Candona acuminata Fischer 1854. 



Length 1.20 to 1.50 mm., height 0.60 mm., width 

 0.46 to 0.50 mm. Posterior extremity of shell sharply 

 pointed. Dorsally about as Candona fahaeformis, but 

 less compressed, and dorsal flanges weaker. Furca 

 eight times as long as wide, decidedly curved, and 

 much the broader at its base. River shores and 

 ponds with rich vegetation; April, May, and Septem" 

 l3er. Texas. 



Fig. 1301. 



Candona acuminata, (a) Left shell of female, X 20; 



(&) Furca: (c^ Left maxillary palp of male. 



