996 PROCEEDINGS OF THE NATIONAL MUSEUM. 



This genus, first established by Brad}' and Norman with 7. gihha as 

 the type, has been further defined by Vavra (1891) and Kaufmann 

 (1900) until it now numbers about eight species and two varieties, all 

 found in Europe. 



28. CRYPTOCANDONA Kaufmann, 1900. 



Oryptocandona Kaufmann, Cypriden iind Darvvinuliden iler Schweiz, Revue 

 Suisse de Zool., VIII, 1900, p. 361. 



Shell smooth, somewhat translucent, J'irst antenna weak, its nata- 

 tory set» longer than the entire antenna. Branchial plate of three 

 set*. Penultimate segment of second foot unsegmented, therefore 

 foot four segmented. Terminal segment of second foot with three 

 setae of different lengths. Furca normal. 



This genus has been established by Kaufmann to include C'avdona- 

 like forms, but having very long natatory setse on the first antennae 

 and a branchial plate of three sette. I believe it will ultimately rank 

 as a group of the genus Oandotia, but consider it best here to use it as 

 given by Kaufmann.'^' 



No American forms known. 



29. CANDONA Baird, 18BO. 



Cypris O. F. Muller, Entonios. sen Insecta testacea, etc., 1792. 



Candona Baird, The natural history of the British Entomos., Ray Society, 



1850. — Vavra, Monog. der Ostrac. Bohmens, Arch. Naturw. Durchforsch. 



V. Bohmen, VIII, 1891, p. 41. 



Shell white, translucent. Natatory seta3 of first antenna shorter 

 than entire antenna. No natatory setae on second antenna. Second 

 antennae of male six-segmented with two special sense organs, of 

 female five-segmented. 



Branchial j)late of two seta?. Palp of second maxilla of female two- 

 segmented, of male not segmented, and difl^erent in shape. Second foot 

 five- or six-segmented, with two unequally long backwardly directed 

 setae and one forwardly directed seta, Furca normal, strong. Ductus 

 of about .seven rows of chitinous spines. Shell of male ordinarily 

 larger and of another form than that of the female. Can not swim, 

 but creep along the bottom, or burrow. 



Eight forms are reported for America. 



a One of shorter setfe at tij) of second foot sharply refiexed reflexa Sharpe. 



aa Setfe at tip of second foot not refiexed. 



h Length of shell about 1.50 mm. Shell ine(iuivalve, second foot nix-segmented. 



crogmani Turner. 

 hb Length of shell about 1.25 nun, or less. 

 c Furca curved. 



d Second foot six-segmented. 



€ Claws (if furca stout, terminal one one-third length of ramus. 



fahseformis Fischer. 



« Kaufmann, Revue Suisse de Zool., VIII, 1900, p. 361. 



