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 1858. 



Length 3.30 mm., height 2.00 mm., 

 breadth 1.80 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 3.00 mm., height 1.70 mm., 

 width 1.43 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 100. 



