Prof. T. Rupert Jones—Wealden Ostracoda. 537 
1824, pl. 485, pp. 136-8; and was named Cypris Valdensis by Dr. 
Fitton’ in 1836. See Guor. Mac. 1878, p. 109 and 277, Pl. 3, 
Fig. 11; and Quart. Journ. Geol. Soc. vol. xli. 1885, pp. 315-318, 
and 386-837. It is of very general occurrence in the Wealden 
beds,” especially the Weald Clay, and notably in the dark and 
thinly-laminated shales at Compton Bay in the Isle of Wight. It 
occurs, but is rare, in the Purbeck beds of Dorset. 
4, CypripEa DunkKERI, Jones. 
Cypridea Dunkeri, Jones, Quart. Journ. Geol. Soc. vol. xli. 1885, p. 339, pl. 8, 
Ho swOM LOS 17 
To the synonyms mentioned at p. 339, op. cit., add: 
Cypridea granulosa (Dunker), Jones, Grou, Mac. 1878, p. 110, Pl. III. Fig. 16. 
This species is rather rare, but occurs in the Weald Clay of Grange 
Chine,—West of Brook Point,—Brixton Bay,—Atherfield,—and 
Sandown, in the Isle of Wight. It is rarer elsewhere, but has been 
found in the Wadhurst Clay and the Netherfield Limestone of 
Sussex, and in the Upper and Middle Purbeck beds of Dorset. 
5. CYPRIDEA SPINIGERA (Sowerby). 
Cypris spinigera, Sowerby, in Fitton’s Memoir “ On the Strata below the Chalk,’’ 
Trans. Geol. Soc. ser. 2, vol. iv. 1836, p. 345, pl. 21, fig. 8. Figured also by 
Mantell, Lyell, and other authors, 
Cypridea spinigera, Jones, in Morris’s Catal. Brit. Foss. 1854, p. 104. 
Cytherideis unicornis, Jones, Mem. Geol. Surv. Isle of Wight, 1856, p. 158, pl. 7, 
figs. 24-26; Monogr. Tert. Entom. 1856, p. 48. 
Cypridea Vaildensis, Bristow, Mem. Geol. Surv. Isle of Wight, 1862, p. 4, fig. 1. 
Cytherideis unicornis, Jones, Grou. Mac. 1870, pp. 157, 188. 
Cypridea spinigera, Jones, GEou. Maa. 1878, p. 109. 
Jones, Q.J.G.S. vol. xli. 1885, pp. 316, 333, and 334. 
Jones and Sherborn, Grou. Mage. 1887, p. 386. 
In the Quart. Journ. Geol. Soc. 1885, Cypridea spinigera was 
mentioned as being common in the upper part of the Weald Clay at 
Compton Bay, Atherfield, and Sandown in the Isle of Wight, and as 
occurring also in the Wealden beds, but more rarely, of Sussex and 
Surrey. We now find that it occurs abundantly in the Tertiary 
beds of Hamstead Cliff on the north coast of the Isle of Wight. 
Specimens from this locality were described and figured in the Geol. 
Surv. Memoir I. of W. 1856, under the name of Cytherideis unicornis, 
as a subreniform Ostracod, sulcate and tuberculate when young, but 
with a sharp spine on each valve when adult. Careful examination 
of a further series of specimens leaves no doubt that it is the same 
species as that so plentiful in some of the Wealden strata. The 
Tertiary specimens are not so well preserved as those in the Wealden 
clays, nor are they so abundant; but many perfect specimens, young 
and adult, can be readily matched from the two formations. The 
Tertiary specimens are plentiful in a crushed state on the lamina 
of a dark-grey marl (“1D 6,” Geol. Survey) of the Lower Hamstead 
series, Hamstead Cliff. 
Note.—This species, or one extremely like it, has turned up in a 
specimen given to me by the late Dr. Mantell as coming from the 
1 Another species (Cypridea Austeni) was figured in his memoir instead of the true 
Cypridea Valdensis. See Grou. Mac. 1878, p. 277. 
* See Q.J.G.S. 1885, pp. 333 and 334, 
