414 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



Furca (fig. 3) very faintly curved at middle, approximately 15 

 times as long as wide throughout, the dorsal edge armed with a row 

 of closely set, coarse teeth for about one-half its length. 



Terminal claw stout, nearly straight, about six and one-half times 

 as long as width of furca. Subterminal claw about four and one-half 

 times as long as width of furca, the terminal seta being about the same 

 length. The usual dorsal seta of Cypris is replaced by a spine, which 

 is one and one-half times as long as average width of furca, and 

 situated about one-half width of furca from subterminal claw. This 

 spine is one of the chief characteristics of the genus. All of the claws 

 are smooth and show little evidence of pectinations. 



Maxillary palps of the male (fig. 2) resembling those of the genus 

 Cypria. but blunt and strong. Copulatory organs of male plate-like. 



This species may be at once distinguished from all other described 

 species of the genus by the strongly pectinated furca. But nine 

 species of the genus have heretofore been described, seven from 

 Australia by Prof. G. O. Sars and two from Europe by Dr. G. S. 

 Brady. Most of these were characterized by faint longitudinal stria- 

 tions on the shell, Avhich I fancy might not always be in evidence, 

 depending on age. 



The shell of the female is somewhat smaller than that of the male, 

 all dimensions being in proportion. 



Described from a number of specimens belonging to the U. S. 

 National Museum from Europe?, type localit}^. (Jeffreys collection, 

 No. TOT.) The male was described from a single specimen found in 

 the stomach of Spatula elypeata (Linna?us), South Carolina. Bio- 

 logical survey Nos. 12045 and 59664. 



Type.— Cat. No. 38340, U.S.N.M. 



Sioblainily NOTODROMADIN"JE. 

 13. Genus CYPROIS Zenker, 18S4. 



Cyprois Zenker, Wieg. Arcbiv. f. Naturg., XX, 1854, Pt. 1, p. SO. — Brady 

 and Norman, Trans. Royal Dublin Soc, 1S89, p. 96. — Daday, Termesz. 

 Fus., XVIII, 1895.— Kaufmann, Revue Suisse de Zool., VIII, 1900, p. 

 258.— MtJXLER, Zoologica, XII, Heft 30, 1900, p. 49.— Sharpe, Proc. 

 P. S. Nat Mus., XXVI, 1903, p. 975. 



Shell high, compressed, smooth, and showing a similarity to that 

 of the genus Notod muni*. Second antenna 5-segmented in both 

 sexes. First maxillary process with six strong toothed spines. Na- 

 tatory setae reach the tips of the terminal claws. Second foot ending 

 with a claw and a rellexed seta. Furca with the two terminal claws 

 seta-like, therefore an appearance as though four long seta 1 at tip 

 of ramus. Furca of the male more bent than that of the female. 

 No American forms heretofore reported. Sexual. 



