2S TERTIARY ENTOMOSTRACA OF ENGLAND. 



(C. scahra, Miinster; see Bosquet's ' Entom. Tertiair.," p. 103, pi. v, fig. 7); iu 

 others they pass into spines (C. erlcea, 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. Sherlwrn and 

 Chapman. (British Museum.) 



2'J. CvTHEKK scABROPAPULosA, Joues. Plate II, fig. IG. 



Cytheee sCABHOPAPirLOSA, Joiies. Monogr. Tert. Eutom., 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. scahropafnlosa " from the Antwerp Crag (' Trans. Zool. 

 8oc.,' vol. X, 1878, p. 393, pi. Ixvi, fig. 2), being much rougher and more warty, 

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

 rudis. 



29*. CvTHEPvE SCABUOPAPULOSA, Jones ; var. ACULEATA, /. Sf 8. Plate II, figs. 17 a, b. 



Cttueee scaueopapulosa, Jones. Geol. Mag., 1887, p. 391, pi. xi, fig. 6. 



This is a well-grown valve of C. scahropapulosa 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. (Britisli Museum.) 



30. Cythere delirata,^ Jones Sf Sherborn. Plate III, figs. 16 c?., b. 



CxTHEHE DELIEATA, Jones ^ Sherhom. 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 



' 'Mem. Courounes, &e., Acad. Roy. Belg.,' vol. xxiv. 

 '^ Ploughed witli divergent furrows. 



