﻿FRESH-WATER OSTRACODA FROM BRAZIL — TRESSLER 71 



straight and finely haired along its dorsal margin. Terminal claws 

 strong and delicately toothed in their distal half. Subterminal claw 

 three-fourths the length of the terminal claw. Terminal seta seven- 

 sixteenths the length of the terminal claw. Dorsal seta strongly 

 developed and equal to the terminal seta in length. Both setae 

 heavily haired on distal portions. Length 4.6 mm.; height 2.95 mm. 



Male: Unknown. 



Holotype.—V.S.NM. No. 83013. 



Type locality. — The type and nine other females were found in a 

 collection made by Dr. Wright in the Acude Serrote near Maranguape. 

 Ceard (May). 



Remarks. — This large ostracod may be identified easily by the 

 shape of the shell. Chlamydotheca unispinosa, which has a similar 

 posterior spine, has a much lower and flatter shell. I take pleasure 

 in dedicating this species to Dr. Herm. Kleerekoper. 



CHLAMYDOTHECA WRIGHTI. new species 



FiGUBB 13, a-c 



Specific characters. — Female: Both valves with very prominent 

 anterior flanges. Dorsal margin arched and highest a little anterior 

 to the middle. Dorsal margin with a slight indentation in the ocular 

 region. Anterior and posterior ends rounded with prominent pore 

 canals in the hyaline border. Ventral margin flattened and slightly 

 concave. Right valve with a much wider anterior flange than the 

 left. Just posterior to the anterior flange there is a slight indication 

 of a shallow incisure. Surface of valves smooth with almost no hairs. 

 Color of preserved specimens a beautiful bluish green with brown 

 markings. Natatory setae of second antennae not as well developed 

 as in C. Heerekoperi and reaching to the tips of the terminal claws. 

 Terminal claw of first leg considerably shorter than in kleerekoperi 

 and not haired. Second segment of first leg with the two setae on 

 its inner distal margin, which are characteristic of the genus, and 

 in addition a third seta located just posterior to the regular pair. 

 Third seta slightly shorter than the posterior seta of the regular pair. 

 Second leg with a shorter reflexed seta and a more curved terminal 

 beak than in kleerekoperi. Terminal beak recurves in an almost 

 complete circle. Furca similar to that of kleerekoperi. Terminal 

 bristle two-sevenths the length of the terminal claw. Dorsal 

 margin with a series of five groups of fine hairs. Length 3.19 mm.; 

 height 1.75 mm. 



Male: Unknown. 



Holotype.—U.^.'^.M. No. 83010. 



Type locality. — The type and two other females were taken from 

 Acude LTm.ary, Sao Pedro, southern Ceard, by Dr. Wright (August). 



Remarks. — This species may be identified readily by the shape of 



