﻿70 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOo 



Remarks. — This large and easily recognized ostracod is much more 

 widely distributed than the early records would seem to indicate. 

 Its present range is from southern Brazil to as far north as Illinois and 

 Maryland. 



CHLAMYDOTHECA ARCUATA (Sars) 



Figure 13, h, i 



Cypris arcuata Sars, Arch. Naturv. Christiania, vol. 24, No. 1, p. 23, 1901. 

 Chlamydotheca mexicana Sharpe, Proc. U. S. Nat. Mus., vol. 26, p. 976, 1903. 

 Chlamydotheca arcuata Furtos, Ohio Biol. Surv. Bull. 29, vol. 5, No. 6, p. 440, 1933. 



Specific characters. — Female: Dorsal margin strongly arched and 

 rounded. Anterior flanges well developed, that of the right equaling 

 one-eighth the total length of the valve. From above broadest in the 

 posterior third; left valve encloses the right and projects beyond it at 

 the posterior extremity. Both extremities pointed, the anterior 

 being more sharply pointed. Natatory setae of second antennae do 

 not reach to the tips of the terminal claws. Furca long and straight 

 with a pectinated dorsal margin. Dorsal seta half the length of the 

 terminal seta. Terminal claw shorter than dorsal seta. Length 2.68 

 mm.; height 1.53 mm. 



Male: Unknown. 



Material examined. — Eleven specimens, all females, were found in 

 a collection made by Dr. Wright in Acude Umary, Sao Pedro, South 

 Ceara (August) and one specimen was found in an artificial lake at 

 Lavras, Ceard (August). 



Recorded distribution. — Ohio, Mexico (Furtos. 1933); Florida (Hoff, 

 1944); Louisiana (Tressler, 1947); Brazil (Itatiba) (Sars, 1901). 



CHLAMYDOTHECA KLEEKEKOPEKI, new species 



Figure 12, o-s 



Specijic characters. — Female: Valves of markedly dissimilar shapes; 

 the right valve slightly higher than the left, with a prominent spine 

 at the posteroventral border. Left valve more broadly rounded in 

 the anterior end and flattened on the dorsal margin. Eight valve 

 highest in the posterior half with a slightly flattened mid portion, 

 which forms an angle just anterior to the center and then slopes 

 steeply toward the anterior end. Posterior m.argin broadly rounded; 

 ventral margin nearly straight. Left valve with a broadly rounded 

 posterior margin; ventral margin convex. Inner duplicatures well 

 developed in both shells, the anterior duplicature larger than the 

 posterior. Valves smooth and very sparsely haired. Natatory setae 

 of second antennae well developed and barely reaching the tips of the 

 terminal claws. First leg with well-developed terminal claw and 

 definitely divided third segment. Second leg with a very much re- 

 curved terminal beak and a long reflexed seta. Furca long and 



