THE OSTRACODA 



82 S 



105 (106) Subterminal claw of furca decidedly S-shaped (Fig. 1296 d). 



Candona simpsoni Sharpe 1897. 



Length 0.73 mm., height 0.31 mm., width 0.29 

 mm. Yellowish white. Left valve overlaps the 

 right. Upper and lower valve margins nearly 

 parallel. Furca curved, stout, seven times as 

 long as wide with the subterminal claw decidedly 

 S-shaped a marked character. Dorsal seta 

 twice width of furca from subterminal claw, and 

 two-thirds its length. Bottom forms of lakes 

 and river shores, and ponds; spring and autumn. 

 Illinois. 



FIG. 1296. 



Candona simpsoni. (a) Side view, X 47; (6) Second leg; 

 (c) Second antenna; (d) Furca. 



106 (105) Subterminal claw not S-shaped (Fig. 1297 c) 107 



107 Shell with dorsal and ventral margins nearly parallel (Fig. 1297 a). 



Candona parallda G. W. Muller 1900. 



Length 0.78 to 0.85 mm., height 0.42 to 0.46 mm., 

 width 0.35 to 0.42 mm. Height to length about as 

 i to 1 8. Furca straight, about seven times as long as 

 wide, its terminal seta rudimentary, and its terminal 

 claws doubly pectinate with unusual teeth. Dorsal 

 seta about twice width of furca from subterminal 

 claw. Second leg five-segmented. Swampy ponds; 

 May. Colorado. 



FIG. 1297. 



Candona parallela. (a) Side view, X 37i; (&) Second leg; 

 (c) Furca; (d) Terminal claws of furca. 



108(109) Furca plainly curved (Fig. 13016) 112 



109 (108) Furca not plainly curved, approximately straight (Fig. 1298 d). no 



no (in) Both claws of furca plainly S-shaped (Fig. 1298 d). 



Candona sigmoides Sharpe 1897. 



Length of male 1.25 mm., height 

 i .63 mm. Second leg five-segmented. 

 Furca long and straight, about twelve 

 times as wide as average width. 

 Dorsal seta about four times width 

 of furca from subterminal claw. Fe- 

 male not known. Lake and river 

 shores; May and October. Illinois. 



FIG. 1298. 



Candona sigmoides. (a) Side view of 

 male, X 15; (&) Second leg; (c) Second 

 antenna; (d) Furca. 



