CYTHEIIE. 21 



7. Cythbre reourata, 1 Jones 8f Sherbom. Plate I, fig. 1. 



Cythere recurata, Jones & Sherborn. Geol. Mag., 1887, p. 388. 



Oblong-reniform, nearly equal at the ends in the outline, but thickest poste- 

 riorly, as seen in edge view. Approximating to fig. 7 g of G. S. Brady's 

 C. demissa, in pi. xii of the ' Report Challenger Ostracoda,' but more even in 

 outline. Coarsely punctate ; the pits somewhat in lines, but with a tendency to 

 assume a concentric arrangement on the front half of the valve. There are others 

 of the same outline, but differing in the ornament. 



From the " Norwich Crag " of Southwold. (British Museum.) 



8. Cythere ? amissa, Jones. 



Cythere Kostelensis (non Beuss). Jones, Q. J. G. S., vol. x, 1854, p. 161, pi. iii, 



fig. 10 ; Monogr. Tert. Entom., 1857, p. 28, 

 pi. vi, figs. 14 a, b. 

 — amissa, Jones. Geol. Mag., 1870, p. 156. 



The doubt with which this was referred to Reuss' C. Kostelensis was confirmed 

 when a better figure of that species was published by Egger (' Neues Jahrb., &c.,' 

 1858, p. 429, pi. iv, fig. 4. The Woolwich specimen was named C. amissa in 1870. 

 Its generic relationship is somewhat doubtful. (British Museum.) 



9. Cythere Charlesworthiana, Jones Sf Sherborn. Plate III, fig. 10. 



Cstheee Charlesworthiana, Jones & Sherborn. Geol. Mag., 1887, p. 390. 



A neat small Cythere, oblong, with front end rather obliquely rounded, and 

 the posterior nearly square. Ventral edge slightly incurved, dorsal faintly arched. 

 Broadest at the anterior third near the front hinge-joint. Surface ornamented 

 with very delicate elongate pits, arranged in lines lengthwise, but curving in 

 front, parallel with the margin. The anterior margin is neatly denticulate, espe- 

 cially on its dorsal third. This differs from our Cythere recurata in being truncated 

 posteriorly, broader and denticulated in front, and also in its ornament. The 

 form nearest to this that we know of is C. te7iera,G. S. Brady, ' Trans. Linn. Soc.,' 

 vol. xxvi, p. 399, pi. xxviii, figs. 29 — 32 ; but in shape and ornament it differs. 



From the Weybourn Crag of East Runton, collected by Mr. Clement Reid, 

 F.G.S. (Museum Practical Geology.) 



1 " Finished in a workman-like manner.'' 



