336 Mr. F. Chapman on Ostracoda 



by Messrs. Jones and Sherborn from the London Clay of 

 Piccadilly (Sherborn and Chapman coll.). In the Gault of 

 Folkestone it occurred in the washings from zones iii., v., x., 

 and xi. 



Cythere Harrisianaj Jones, var. reticosa^ Jones and Hinde. 



Cythere Harrisiana, Jones, var. reticosa, Jones and Hinde, 1890, Suppl. 

 Mod. Cret. Entom. p. 18, pi. i. fig. 46. 



This variety was originally described from Gault specimens. 

 At first sight it is perhaps difficult to separate this variety 

 from those varieties of Cythere Koninckiana, Bosquet, which 

 have a weak ornamentation ; the surface of the carapace in 

 C. Harrisiana^ Yar. o'eticosa, is, however, merely pitted, whilst 

 C. KonincJciana has a raised mesh-like ornament. 



C. Harrisiana, var. reticosa^ is represented in the series of 

 Ostracoda from Swaflfham by one valve only. 



Cythere gaultina, Jones. 



Cythere gaulthia, Jones, 1849, Monogi'. Entom. Cret. p. 17, pi. ii. 

 figs. 7 a-c ; Jones and Hinde, 1890, Suppl. Mon. Cret. Entom. p. 18, 

 pi. i. figs. 35, 36. 



The specimens from Swaffham, of which five valves were 

 found, are somewhat smaller than those found in the Gault 

 of Kent and Surrey, but the surfaces of the valves are charac- 

 teristically marked with the tessellated ornamentation and 

 with tlie low pyramidal elevation. 



Cythere gaultina, Jones, var. excavata, Chapman and 

 Sherborn. (Figs. 2 a, h.) 



Cythereis excavata, Chapman and Sherborn, 1893, Geol. Mag. toI. x. 

 p. 348, pl. xiv. fig. 8. 



This appears to be a variety of the type C. gaultina^ but 



Fiff. 2. 



5. 



Cythere c/aultina, Jones, var. excavata, Chapman and Sherborn, 

 a, left valve ; b, edge of valve, x 40. 



differs in the e.x.iggerated form of the surface-ornament both 



