128 FOSSIL ESTHERI^. 



abundantly in the Wealden shales of Hanover (with Estheria ; see above, p. 104), as we 

 find them in England also, both in the Weald Clay and the Purbeck Beds. The 

 variations in size, shape, and surface-condition, such as are shown in figs. 26 — 30, with 

 others intermediate, are also met with in England. 



M. Bosquet judiciously proposed the term Cypridea for these Wealden Cyprid(B 

 ('Descript. Entom. Tertiair.,' 1850, p. 48) ; and I have already pointed out ('Monogr. 

 Tert. Entom.,' 1850, p. 9 & p. 21) that they are related to the recent Cyprideis, which, 

 though probably a sub-genus of Cythere, inhabits fresh and brackish water. 



10. Cypridea oblonga (?), Boemer, sp. PI. V, figs. 31 — 34. 



Cypris oblonga, Boemer. Verstein. Nordd. Oolithengeb. Nachtrag, 1839, p. 32, pi. 20, 

 fig. 21. 

 — — Bunker. Monog. Nordd. Wealdenbild., 1846, p. 60, pi. 15, fig. 26. 



In company with C. Valdensis, this narrower form occurs plentifully in the Wealden 

 shale of Hanover (with Estheria) ; and although in the specimens I have examined I 

 cannot detect the antero-ventral notch, it may still exist in some, as figiued by Dr. 

 Dunker. Eig. 33 is most like the form illustrated in the 'Monogr. Nordd. Weald.;' 

 but I think that variation of growth and modification by pressure may have given 

 rise to the somewhat similar valves figs. 31, 32, and 34. These are all freely mixed 

 on some planes of the shale, and seem to ofier intermediate gradations, even into C. 

 Valdensis, with which they also occur. They are, moreover, generally much crushed, 

 and their margins are not clearly exposed. 



Eigs. 31 and 34 are not unlike the Candona noticed in the foregoing pages and 

 figured in PI. V, but for the present I propose to leave them as here arranged, hoping 

 for a future opportunity of elucidating all the Wealden Cyprida. 



