o38 Mr. F. Chapman on Ostracoda 



numbered 2 and 4 on the plate in the * Geological Magazine ' 

 above referred to have been obviously transposed. Moreover 

 the raised rim or mesh-wall surrounding the pittings, so 



Fig-. 4. 



a. J, 



Cyihere Konmckiana, Bosquet, a, left valve ; h, edge of valve. X 40. 



characteristic of C. Koninckiana^ is not very clear in the 

 specimen from which the drawing was made. 



This species is represented in the Cambridge Greensand 

 by four separate valves and a carapace from Swaffhara. 



(Subgenus) Cytheeeis, Jones, 1849. 



Cythereis triplicata (Romer). 



Cytherina ti-ij)lkata, Eomer, 1840, ^^er,stei^. norddeutt-cb. Kreidegeb. 



p. 104, pi. xvi. fig. 16. 

 Cythereis triplicata, Jones, 1849, Mon. Eutom. Cret. p. 18, pi. iii. 



figs, da-h ; Jones and Hinde, 1860, Siippi. Mon. Cret. Entom. p. 19, 



pi. i. figs. 56-61. 



This species, which ranges from the Gault to the Chalk, 

 nas been previously noticed in the Cambridge Greensand. 

 It is fairly frequent in the Greensand of S waff ham. 



Cythereis triplicata (Romer), var. lineata, Chapman 

 and Sherborn. 



Cythereis triplicata (Eomer), var. lineuta, Cbapnian and Sberborn, 1893, 

 Geol. Mag. vol. x. p. 348, pi. xiv. fig. 5. 



Four separate valves of this variety were found at S waff ham. 



Cythereis auricidata (Cornuel). 



Cythere auriculutu, Cornuel, 1846, Mem. Soc. geol. France, ser. 2, 



vol. i. pt. 1, p. 200, pi. viii. figs. 14-16. 

 Cythei-eis awiculuta, Jones and liiude, 1890, Suppl. Mon. Cret. Entom. 



pp. 19, 20, pi. i. tigs. 53-55. 



This species seems to be well distributed througli the 

 Cretaceous formation, but is new to the Cambridge Greensand. 

 It is somewhat common in the washings from JSwaffham. 



