ChRYR-marl of Hitchin, Herts. 593 



Cypria lesvis, Brady and Norman, 1889, Sci. Trans. R. Dubl. Soc. ser. 2, 



vol. iv. p. 69. 

 Cyclocy2}ris Icevis, Brady and Norman, 1896, op. cit, vol. v. p. 718. 



The species is fairly common in the " freshwater bed " of 

 Hitchin. It is a common form in this country in fresh and 

 brackish water. 



Cyclocypris glohosa (G. 0. Sars). 

 (PI. XV. figs. 3, 4.) 



Cypris glolosa, G. 0. Sars, 1863, Om en i Sommeren 1862 foretagen 

 Zoologisk Reise i Christianias og Trondhjems Stifter, p. 27. 



Cypi-is cincrea, Brady, 1868, Mouogi-. Rec. Brit. Ostrac. p. 374, pi. xxiv. 

 tigs. 39-42, pi. xxxvi. fig. 7. 



Cyclocypris globosa, Brady and Norman, 1889, Sci. Trans. R. Dubl. Soc. 

 ser. 2, Tol. iv. p. 71, pi. xi. figs. 10-18, pi. xiv. figs. 1, 2. 



The discovery of this species in the Hitchin deposits is of 

 much interest, for it is quite a northern species, having been 

 recorded from fossil deposits in Scotland ; and as a recent 

 form it is still found living in the lochs and pools of the 

 border counties of England, in Scotland, and in Norway. 

 The species is by no means uncommon at Hitchin. 



Genus ScOTTiA, Brady and Norman. 



Scottia Browniana (Jones). 



Cypris Broumiana, Jones, 1850, Ann. & Mag. Nat. Hist. ser. 2, vol. vi. 

 p. 25, pi. iii. fig. 1 ; 1856,Monogr. Tert. Entom. p. 13, pi. i. figs. \a-d. 



This is also a northern species. Mr. T. Scott found it 

 living in pools in the island of Bute {Brady and Norman). 

 It was found fossil at Clacton, Essex, by Professor Kupert 

 Jones, and since recorded by him from Hitchin and from 

 Sidestrand, Suffolk, and Chesilton, Dorset. 



Genus Cypeis, Miiller. 



Cypris virens (Jurine). (PI. XV. figs. 5, 6.) 



Monoculus virens, Jurine, 1820, Hist, des Monocles, p. 174, pi. xviii. 



figs. 15, 16. 

 Cypris virens, Zaddach, 1844, Syn. Crust. Pruss. Prod. p. 35; Brady 



and Norman, 1889, Sci. Trans. R. Dubl. Soc. ser. 2, vol. iv. p. 74. 



A common and widely distributed form, and as a recent 

 species inhabiting " grassy pools and ditches which dry up in 

 the summer" [Brady and Norman). 



Only one valve of this species was found in the marl from 

 Hitchin. 



