. Fresh-water biology. Freshwater biology. THE OSTRACODA 8ll 31 (30) Furca normal, with two spines and two setae (Fig. 1264 6). . 32 33 (33) Second segment of first leg with two setae on anterior margin (Fig. 1260 d). Three spines on first maxillary process. Chlamydotheca Saussure 1858 . 34 33 (32) Second segment of first leg with one seta on anterior margin (Fig. 1277 b). Two spines on first maxillary process. Herpetocypris Brady and Norman 1889 . 38 34 (35) Shell plain, no special markings of any sort. Seen from above, the shell is decidedly wedge-shaped anteriorly (Fig. 1260). Chlamydotheca
. Fresh-water biology. Freshwater biology. THE OSTRACODA 8ll 31 (30) Furca normal, with two spines and two setae (Fig. 1264 6). . 32 33 (33) Second segment of first leg with two setae on anterior margin (Fig. 1260 d). Three spines on first maxillary process. Chlamydotheca Saussure 1858 . 34 33 (32) Second segment of first leg with one seta on anterior margin (Fig. 1277 b). Two spines on first maxillary process. Herpetocypris Brady and Norman 1889 . 38 34 (35) Shell plain, no special markings of any sort. Seen from above, the shell is decidedly wedge-shaped anteriorly (Fig. 1260). Chlamydotheca azteka Saussure Length mm., height mm., breadth mm. Yellowish gray. One of the largest species of the genus known. Natatory setae of the second antennae reach to tips of terminal claws. No males known. Seen from above, the shell is much more wedge-shaped anteriorly than C. mexicana. It also lacks the greenish stripes in the shell. Furca almost straight, about 18 times as long as wide, and faintly pectinate on the dorsal margin. Texas, Mexico. Ditches and pools, Oc- tober. Fig. 1260. Chlamydotheca azteka. (a) Side view, X 15: (A) Dorsal view; (c) Furca, X 150; {d) First leg, X 125. 3S (34) Shell with semicontorted and radially arranged colored bands. Shell more tumid from above (Fig. 1261) 36 36 (37) Shell with at least six sinuous radiating dark-green bands on its sides Chlamydotheca herricki Turner 1895. Length mm., height mm., width mm. Light ground color with sinuous and radially arranged dark-green bands. Claws of first mandibular process, smooth. Terminal claw of first leg almost as long as entire leg. Furca straight, one- half the dorsal margin pectinate, about twenty times aslong as wide. Shallow canal basin. Ohio. Fig. 1261. Chlamydotheca herricki, (o) Side view, X 25; (6) Dorsal view; (c) Furca, X Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - color
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