14 TERTIARY ENTOMOSTRACA OF ENGLAND. 



account of their general likeness to " Gandona reptans," which has since then been 

 transferred to Cypris on account of some slight differences in the limbs. This 

 doubt as to their generic relationship was indicated in the ' Geol. Mag.,' 1870, 

 p. 158, but it is not yet strong enough to lead us to alter the present 

 arrangement. (British Museum.) 



VI. CYPRIDBA, Bosquet, 1852. 



This genus is described at large in the 'Quart. Journ. Geol. Soc.,' vol. xli 

 (1885), p. 336. Remarks on the possible alliance existing between Cypridea and 

 Chlamydofheca have been made by G. S. Brady, in the ' Proceed. Zool. Soc. 

 Lond.,' 1886, p. 90; and in the 'Journ. Linn. Soc.,' vol. xix (1886), pp. 200, 201. 



In the early days of geology, naturalists could offer only Gythere and Gypris 

 for recent analogues of the fossil Entomostraca, since recognised as Ostracoda ; 

 Gypris being taken as the type for freshwater, and Gythere for marine, forms. 

 Hence the Ostracoda of the Weald Clay were called Gyprides, and, when differ- 

 entiated, Bosquet gave them the name of Gypridea. We have now found such 

 forms in the Tertiary Beds of the Isle of Wight. We know nothing of the soft 

 parts ; their shell-structure need not remove them from the Gyprididce, and we 

 place them after Candona, in the freshwater series (p. 2), although in their shell- 

 structure they have some relationship with Ghlaviydotheca, which is closely allied 

 to Gypris anatomically. 



1. Cypkidea si'iNiGERA {Sowerby, 1836). Plate I, figs. 8 — 11; and Plate III, 



figs. 1 a, h. 



Cypbis spinigeea, Sow. In Fitton's Memoir ' On the Strata below the Chalk,' 



Trans. Geol. Soc., ser. 2, vol. iv, 1836, p. 3i5, pi. xxi, 

 fig. 3. 

 Cypeidea — Jones. In Morris's Catal. Brit. Foss., 185i, p. 104. 



Cytheeideis unicoenis, Jones. Mem. Geol. vSurv., 1S56, p. 158, pi. vii, figs. 24 — 



26; Monogr. Tert. Entom., 1857, p. 48; and 

 Cytherideis ? unicornis, Jones, Geol. Mag., 

 1870, pp. 157, 159. 

 Cypuidea spinigeea, Jones. Quart. Journ. Geol. Soc, vol. xli, 1885, pp. 316, 333, 



and 334. 

 — — Jones S( Sherhorn. Geol. Mag., 1887, p. 386. 



This is referred to 'Quart. Journ. Geol. Soc.,' he. eit., as a species common 

 in the upper part of the Weald Clay at Compton Bay, Atherfield, and Sandown, 

 in the Isle of Wight, and as occurring in other Wealden Beds, but more rarely, 

 in Sussex and Surrey. 



