824 



FRESH-WATER BIOLOGY 



98 (97) Furca decidedly curved. 

 1293 a). . . 



Dorsal-valve margins " humped " (Fig. 

 Typhlocypris delawarensis Turner 1895. 



Length 0.95 mm., width 0.43 mm., height 0.54 mm. Color 

 greenish yellow with brown blotches. Maxillary spines plain. 

 Terminal claws of furca slender and plain. Furca slender and 

 much curved. Creeks; March. Delaware. (A doubtful form, 

 not well described.) 



FIG. 1293. 

 Typhlocypris delawarensis. (a) Side view, X 15; (b) Furca. 



99 (100) Shorter seta of terminal segment of second leg outwardly flexed 



(Fig. 129401). 



Candona reflexa Sharpe 1897. 



Shell twice as long as high, cine- 

 reous. Second leg five-segmented, 

 its terminal segment as wide as long, 

 and about one- third as long as the 

 penultimate segment. Furca eight 

 times as long as wide and slightly 

 curved. Dorsal seta as long as sub- 

 terminal claw. This is the only 

 Candona known with the peculiar, 

 partly reflexed seta of the second 

 foot, and it may be a characteristic 

 of a young stage. Tows along lake 

 shores along the bottom; April to 

 November. Illinois. 



FIG. 1294. 



Candona reflexa. (a) Second leg; 

 (6) Furca; (c) First leg. 



ioo (99) Shorter seta of terminal segment of second leg not outwardly 

 flexed (Fig. 1296 >) < 101 



101 (102) Length of shell more than 1.50 mm. 



Candona crogmani Turner 1894. 



Length 1.52 mm., height 0.76 mm., width 0.58 mm. 

 Shell thin, pellucid, inequivalve, greenish yellow. Max- 

 illary spines plain. Second leg indistinctly segmented. 

 Furca straight, ten times as long as average width, its 

 terminal claws pectinate. Dorsal seta one-third length 

 of furca from subterminal claw. Shallow, temporary 

 ponds; December. Georgia. 



FIG. 1295. 



Candona crogmani. (a) Side view, X 15; (&) Dorsal view; 

 (c) Furca. 



102 (101) Length of shell not more than 1.50 mm 103 



103 (104) Length of shell less than one mm 105 



104 (103) Length of shell more than one mm 108 



