332 Mr. F. Chapman on Oslracoda 



proved of much interest, and to facilitate the comparison of 

 the microzoic fauna of this with other Cretaceous groups the 

 following notes have been put together. 



Family CyprididsB. 

 Paracypris, G. O. Sars, 1865. 



Paracypris sih'qua, Jones and Hinde. 



Paracypris siliqua, Jones and Hinde, 1890, Suppl. Mon. Cret. Eiitoni. 

 pp. 2, 3, pi. ii. figs. 48, 49, 51, pi. iii. figs. 33, 34. 



This species has been described mainly from Upper- Chalk 

 specimens; it has also been recorded from the Gault of 

 Folkestone from zones x., xi., and xiii., but was not met with 

 in the Greensand seam zone xii.* It is by no means a common 

 form. One valve was found in the Greensand of Swaffham. 



PONTOCYPRIS, G. 0. Sars, 1865. 



Fontocypris Bosquetiana, Jones and Hinde. 



Pontocypris Bosquetiana^ Jones and Hinde, 1890, Suppl. Mon. Cret. 

 Entom. pp. 4, 5, pi. ii. fig. 65, pi. iv. fig. 3. 



This species was known from the Gault and the Chalk- 

 marl. 



Four characteristic and well-preserved carajjaces were 

 found in the Cambridge Greensand at Swaffham. 



Pontocypris triquetra (Jones). 



Bairdia triq%(etra, Jones, 1849, Monogr. Entom. Cret. p. 27, pi. vi. 



figs. 19 a-c. 

 Pontocypris triquetra, Jones and Hinde, 1890, Suppl. Mon. Cret. Entom. 



p. 4, pi. iii. figs. 22-24, 35-37. 



A well-distributed form, but apparently always rare. It 

 has been found in the Gault of Folkestone in zones v., vi., x., 

 and xiii. ; in the Greensand (Cenomanian) of Blackdown, 

 Devon ; tlie " Chalk detritus " ; and the Upper Chalk. 



One carapace and a single valve were found at Swaffham. 



* Chapman and Sherborn, Geol. Mag. vol. x. 1893, p. 346. — N.B. Zones 

 xi. to xiii. were then included in one bed, zone xi. The writer now 

 regards the Greensand seam at 20 feet from the top of the Gault at 

 Folkestone as zone xii., whilst above this is zone xiii. See also Journ. 

 E. Micr. Soc. 1898, p. 17. 



