450 Jones and Sherborn — Tertiary Entomostraca. 



IV. — FuKTHER Notes on the Tektiaby Entomosteaca of England, 

 WITH Special Reference to those from the London Clay. 



By Professor T. Eupert Jones, F.E.S., and C. Davies Sherbokn, F.G.S.^ 



{Continued from p. 392.) 

 28. Cythere costellata (Eoemer), var. triangulata, nov. 



The specimen under notice is relatively shorter, broader (higher), 

 more triangular, and with sharper ridges than the figure in the 

 ' Monograph,' 1856, pi. vii. f. 21. The anterior hinge is more pro- 

 minent, and the front margin rather oblique. It is also narrower 

 behind, ending with three small spines or denticles. The edge view 

 is acute-ovate. From the Belosepia-bed, Bracklesham. T. E. 

 Jones' Collection. 



This variety of C. costellata is figured and described in the 

 ' Monogr. Post-Tert. Entom.' 1874, p. 152, pi. xvi. figs. 13-15, from 

 Selsey, and there recognized as being probably of Tertiary date, 

 though found in the superficial mud. 



29. Cythere plicata, Miinster. 

 We have a nan-ow and compressed carapace, contracted posteriorly, 

 from the Belosepia-bed, Bracklesham. T. R. Jones's Collection. 

 This species is noticed in the Geol. Mag. 1874, p. 479, as having 

 been found in the London Clay of Copenhagen Fields, with two 

 species of CJiara. 



30. Cythere latimarginata, Speyer. 



Cythere latimarginata, Speyer, Tert. Ostrac. CaselL, 1863, p. 22,'pl. iii. fig. 3. 



Cythere abyssicola, G. 0. Sars, Overs. Norg. Mar. Ostrac, 1865, p. 163. 



Cythere latiniarqinata, Brady, Crosskey, and Robertson, Monogr. Post-Tert. Entom., 



1874, p. 163, pi. xvi. fig. 6. 

 Cythere latitnarginata, G. S. Brady, Trans. Zool. Soc, vol. x. p. 389, pi. Ixiv. fig. 8. 



Following Dr. Brady's determination of this species in the papers 

 above mentioned, we refer this specimen to Speyer's species. The 

 figure in the " Monogr. Post-Tert. Entom." comes nearest to our 

 form, but is furthest from Speyer's original figure, to which the 

 figures of the Antwerp-Crag specimens in ' Trans. Zool. Soc' nearly 

 approximate. 



One valve ; White (Coralline) Crag. T. R. Jones's Collection. 



31. Cythere angulatopora (Reuss). 



Cypridina angulatopora, Eeuss, Haidinger's Nat. Abth. vol. iii. 1854, p. 86, pi. x. 

 fig. 32. 

 An oblong valve, with parallel dorsal and ventral margins, and 

 rounded ends. Surface with numerous small, more or less angular 

 pits, arranged in parallel rows. A series of pits independently of 

 the other ornament, follows the semicircular outline of the anterior 

 end, just within the margin. The hinder margin is toothed. A 

 single valve, associated with Nummulites elegans, in a bed regarded as 

 at the top of the Bracklesham series. Hunting Bridge, New Forest. 

 Collected by Mr. Keeping. T. R. Jones' Collection. 



1 For Plate XI. sea September Number Geol. Mag. facing p. 385. 



