2S TERTIARY ENTOMOSTRACA OF ENGLAND. 



(C. scabra, Minister; see Bosquet's ■ Entom. Tertiair.,' 1 p. 103, pi. v, fig. 7); in 

 others they pass into spines (G. ericea, G. irpex, and others ; G. S. Brady, 

 ' Challenger Ostrac.,' pis. xvii and xviii) ; we have also a passage-form. 



The above and two following forms have a subovate edge view. They were 

 found in the London Clay of Piccadilly, London, by Messrs. Sherborn and 

 Chapman. (British Museum.) 



29. Cythere scabropapulosa, Jones. Plate II, fig. 16. 



Cythebe scabkopapolosa, Jones. Monogr. Tert. Entom., 1857, p. 31, pi. v, 



fig. 16; Jones and Sherborn, Geol. Mag., 

 1887, p. 391, pi. xi, fig. 5. 



This specimen from the London Clay of Piccadilly is more uniformly convex 

 and more rounded posteriorly than the Bracklesham specimen figured in the 

 Monograph, 1857. Moreover, the anterior margin is strongly denticulated, but 

 the dorsal edge is not quite so roughly tuberculated as seen in the valve from 

 Bracklesham. (British Museum.) 



Dr. G. S. Brady's " G. scabro papulosa " from the Antwerp Crag (' Trans. Zool. 

 Soc.,' vol. x, 1878, p. 393, pi. lxvi, fig. 2), being much rougher and more warty, 

 is nearer to G. scabra, Miinster, and might be regarded as G. scabropapulosa, var. 

 ruclis. 



29*. Cythere scabropapulosa, Jones ; var. aculeata, /. 8f 8. Plate II, figs. 17 a, b. 



Cythebe scabbopapulosa, Jones. Geol. Mag., 1887, p. 391, pi. xi, fig. G. 



This is a well-grown valve of C. scabropapulosa becoming hispid, by the 

 tubercles ending with a sharp prickle or spine. A further development of this 

 spinose condition is seen in G. irpex, Brady, mentioned above. Our specimen, like 

 the foregoing, is from the London Clay of Piccadilly. (British Museum.) 



30. Cythere delirata, 2 Jones 8f Sherborn. Plate III, figs. 16 a, b. 



Cytuere delibata, Jones fy Sherborn. Geol. Mag., 1887, p. 391. 



A Cythere of the not uncommon suboblong form, but with the rare ornament 

 of slight furrows diverging up and down from the median line of the posterior 



1 ' Mem. Couronnes, &c, Acad. Roy. Belg.,' vol. xxiv. 



2 Ploughed with divergent furrows. 



