from the " Cambridge Gi'eensand." 335 



Bythocypris, G. S. Brady, 1880. 



Bythocypris Brownei, Jones and Hinde. 



Bythocypris Brownei, Jones and Hinde, 1800, Suppl. Mon, Cret. 

 Entom. pp. 13, 14, pi. iii. figs. 38, 39, 42, 43. 



One carapace of this rare form, occurring hitherto in the 

 Chalk and the Chalk-rock, was obtained from the Cambridge 

 Greensand of Svvaffham. 



Bythocypris Reussiana, Jones and Hinde. 



Bythocypris Reussiana, Jones and Hinde, 1890, Suppl. Mon. Cret. 

 Entom. p. 12, pi. ii. figs. 56 and 61-03. 



This species has been described and noted from the Chalk, 

 the " Chalk-detritus," and the Gault. One carapace was 

 found in the Cambridge Greensand at Swaffham. 



Bythocypris ? iernica (Jones). 



Bythocypris? iernica, Jones and Hinde, 1890, Suppl. Mon. Cret. 

 Entom. pp. 14, 15, pi. iii. figs. 31, 32. 



Formerly recorded from the Upper Chalk of the North of 

 Ireland, this rare species is represented in the Cambridge- 

 Greensand washings from Swaffham by one carapace. 



Family Cytheridae. 

 Cythere, Miiller, 1785. 



Cythere Harrisiana, Jones. 



Cythere Harrisiana, Jones and Hinde, 1890, Suppl. Mon. Cret. Entom. 

 pp. 16, 17, pi. i. figs. 47-52. 



Several valves of the type-form occur in the Greensand 

 washings from Swaffham. 



This species has already been noticed in the Cambridge 

 Greensand, and it ranges from the Lower Greensand to the 

 Upper Chalk. 



Cythere Harrisiana, Jones, var. setosa, Jones and Hinde. 



Cythere Hai-risiana, Jones and Skerborn, 1887, Geol. Mao-, vol. iv. 



p. 452, woodcut tig. 1. 

 Cythere Harrisiana, var. setosa, Jones and Hinde, 1890, Suppl. Mou. 



Cret. Entom. pp. 17, 18, pi. i. figs. 43-45. 



To this variety three of the valves found at Svvaffham can 

 be assigned. It was described by the above authors from 

 the Gault of Kent and Surrey and the Chalk of Ireland, and 



