C\iSiV2i-marl of Hitch'n, Herts. 595 



liyocypris Braclii^ G. O. Sars. 

 (Pi. XV. figs, lo, 14.) 



liyocypris JBradii, G. O. Sars, 1890, Oversigt af Norges Cnistaceer, 

 II. Brancli. Ostrac. Cirrip., Christ. Vidensk. Selsk. Forliand. p, 50 ; 

 Brady and Norman, 1896, Sci. Trans. K. Dubl. Soc. ser. 2, vol. v. 

 p. 728, pi. Ixiii. figs. 22, 23, pi. Ixviii. figs. 18, 19. 



The commoner form of this genus in the Hitchin deposit 

 appears to be the non-tuberculate type defined by G. O. Sars 

 under the above name, of which three valves were found. 



Genns Candona, Baird. 



Candona pubescens (Koch). 

 (PI. XV. figs. 15-17.) 



Cyp-is pubescens, Koch, 1837, Deutschlands Crustaceen &c., Heft xi. 



p. o. 

 Candona 2nibescens, Brady and Nonnan, 1896, Sci. Trans. R. Dubl. Soc. 



ser. 2, vol. v. p. 729, pl. Ixiii. fig. 24, pi. btiv. figs. 20, 21, pl. Isviii. 



figs. 7-9. 



This is a common species in the living condition. As a 

 post-Tertiary fossil it has been recorded from Whittlesea, the 

 Valley-drift near Salisbury, the old land-drift at Chesilton, 

 Portland, the gravels at Barnwell, near Cambridge, and from 

 Hitchin. In the last-named deposit well-formed valves of 

 the species are found, but they are not very common. There 

 are also present several valves of the form usually described 

 under the name of G. albicans, but now thought to be only 

 the young form of C. pubescens. 



Candona lactea, Baird. 

 (Pl. XV. figs. 18, 19.) 



Candona lactea, Baird, 1850, Proc. Zool. Soc. Lond. p. 255, pl. xviii. 

 figs. 25-27 ; Brady, 1868, Monogr. Rec. Brit. Ostrac. p. 382, pl. xxiv. 

 figs. 55-58 ; Brady and Norman, 1889, Sci. Trans. R. Dubl. Soc. 

 ser. 2, vol. iv. p. 100. 



This common freshwater species, which is well known from 

 numerous post-Tertiary deposits, is very common at Hitchin. 



Candona Candida (O. F. Miiller). 

 (Pl. XV. figs. 20, 21.) 



Cypris Candida, MuUer, 1785, Entom. p. 62, pl. vi. figs. 7-9. 



Candona Candida, Jones, 1857, Monogr. Tert. Entom. p. 19, pl. i. 



figs. 8a-f; Brady and Norman, 1889, Sci. Trans. R. Dubl. Soc. ser. 2, 



vol. iv. p. 08, pl. X. figs. 20-23. 



This species is very common in ponds and ditches. 



