234 Aiinals of the South African Museum. 



Family CYTHERIDiE. 

 Genus CYTHEEE Miiller. 



Cythere ? DRUPACEA Jones. 



C. drujmcca Jones, 1884, Quart. Journ. Geol. Soc, vol. xl., p. 772, 

 pi. xxxiv., fig. 30. 



A single specimen of a Cythere with united valves occurred in the 

 present series, which most resemhles the above species. There are, 

 however, one or two slight differences which make the determination 

 doubtful, and only the discovery of a more extensive series of speci- 

 mens would make a proper comparison possible. These differences 

 are — a steeper face to the ventral border, approaching that of 

 Gytheropteron, and a blunt spinose ornamentation of the anterior 

 and posterior extremities towards the ventral angles. 



The specimen described by Professor Eupert Jones came from 

 the Great Oolite stratum of the Richmond boring, England. 



Genus CYTHEREIS Jones. 



Cythebeis ornatissima Reuss sp., var. reticulata Jones and 

 Hinde. 



C. ornatissima Reuss sp., var. reticulata Jones and Hinde, 1890, 

 Mon. Cret. Entom., p. 24, pi. i., figs. 67, 68, 77 ; pi. iv., 

 figs. 9-12. Chapman, 1894, Quart. Journ. Geol. Soc, vol. l, 

 p. 689. Id., 1898, Ann. Mag. Nat. Hist., ser. 7, vol. ii., 

 p. 340. 



A very perfectly preserved valve of this pretty variety occurred in 

 the present series, having two rows of prickles along the anterior 

 border, a characteristic median ridge and tubercle, and a small 

 sharp posterior spine. This species ranges from the Neocomian to 

 the Senonian in England and Ireland. 



Genus CYTHERIDBA Bosquet. 

 Cytheridea longicaudata sp. nov. 

 Plate XXIX., fig. 21. 

 Specific Characters. — Carapace subtriangular, broad in front, 

 attenuated behind. Both angles of the front margin well rounded ; 



