﻿FRESH-WATER OSTRACODA FROM BRAZIL — TRESSLER 67 



distal margin. Furca with pectinated dorsal margin. Mainly large 

 forms, easily distinguished. Restricted to North and South America, 

 as far as is known. 



CHLAMYDOTHECA ALEGRENSIS, new species 



Figure 12, j-m 



Specific characters. — Female: Dorsal margin broadly rounded and 

 highest anterior to the middle. Both extremities well rounded, the 

 anterior more so than the posterior. Ventral margin flat. Eye 

 large and prominent. Posteroventral margin of both valves with a 

 number of toothlike spines, which become progressively larger toward 

 the posteroventral corner. Surface of the valves smooth and sparsely 

 covered with fine hairs. Flanges only slightly produced at anterior 

 margin. Second antennae with natatory setae which do not reach 

 the tips of the terminal claws by a slight margin. First thoracic leg 

 with typical double setae on second segment and a heavy, rather short 

 terminal claw\ Terminal setae at base of terminal claw, well devel- 

 oped. Second leg, typical of the genus, with a curved beaklike terminal 

 claw and a heavy, short, recurved seta. Setae on terminal and sub- 

 terminal segments heavily plumose. Furca only slightly curved. 

 Terminal seta one-fourth length of terminal claw. Dorsal seta one-half 

 the length of subterminal claw. Claws finely toothed in their distal 

 portions. Dorsal margin of furca finely toothed. Length 1.72 mm.; 

 height 1.02 mm. 



Male: Unknown. 



Holotype.—U.S.'N.M. No. 83027. 



Type locality. — Temporary pools near Porto Alegre, Rio Grande do 

 Sul, collected by Dr. Kleerekoper. 



Three additional specimens, also collected by Dr. Kleerekoper, 

 are from a reservoir near Porto Alegre (September) and on grassland 

 near Porto Alegre (September), 



Remarks. — This species does not show the well-marked flanges at 

 posterior and anterior margins so characteristic of the genus. There 

 is only a slight indication of a flange on the anterior margin but the 

 double setae on the first leg and the structure of the other parts leave 

 no doubt as to the identity of the genus. 



CHLAMYDOTHECA INCISA (Clans) 



Figure IZ, I 



Pachycypris incisa Claus, Arb. Inst. Wien, vol. 10, p. 205, 1892. 



Cypris labiata Sars, Arch. Naturv. Christiania, vol. 24, No. 1, p. 20, 1901. 



Chlamydotheca incisa G. W. Muller, Das Tierreich, vol. 31, p. 184, 1912. 



Specific characters. — Female: Height greater than half the length. 

 Highest in the middle. Dorsal margin broadly rounded. Both 

 extremities broadly rounded, the anterior extremitj' of both valves 



