18 TERTIARY ENTOMOSTRACA OF ENGLAND. 



From the London Clay of Piccadilly, London ; collected by Messrs. Sherborn 

 and Chapman. 1 (British Museum.) 



8. Bairdia rhomboidea, Jones Sf Sherborn. Plate I, figs. 3 a, b, c. 



Bairdia rhomboidea, Jones fy Sherborn. Geol. Mag., 1887, p. 388. 



A stiff-looking Bairdia, broadly angular in front, nearly parallel above and 

 below; narrow behind, with a curve on the ventral, and a slope on the dorsal edge 

 of this end. The antero-ventral margin is suddenly nipped in, leaving' a projec- 

 tion behind the antero-ventral slope. The surface is very delicately punctate. 



From the White Crag of Sutton, Suffolk. (British Museum.) 



9. Batrdia ovoidea, Jones Sf Sherborn. Plate III, figs 3 a, b. 



Bairdia ovoidea, Jones & Sherborn. Geol. Mag., 1887, p. 388, pi. xi, fig. 3. 



A very small roundish Bairdia, triangularly obovate, pitted, rosetted at the 

 muscle-spot, with a rather unusual subcircular pattern. The valve is somewhat 

 like fig. 2, pi. iv, ' Monogr. Tert. Entom.,' but much less of a subdeltoidal shape, 

 being well rounded on the anteroventral margin, and curved without any angle 

 behind ; both ends are somewhat obliquely rounded ; the anterior half of the valve 

 is broader (higher) than the hinder portion. 



From the London Clay of Piccadilly, London. Collected by Messrs. Sherborn 

 and Chapman. (British Museum.) 



X. DARWINULA 9 (Darwinella), Brady 8f Robertson, 1870 and J 885. 



1. Darwinula Stevensoni, Brady Sf Bobertson. 



Darwinella Stevensoni, Brady Sf Bobertson. Monogr. Post-Terfc. Foram., 1874, 



p. Ml, pi. ii, figs. 13—17. 



This species belongs to the brackish water of tidal rivers, and has been found 

 in the Forest-bed series of Norfolk, at Mundesley, by Mr. Clement Reid, F.G.S. 

 See ' Geol. Mag.,' 1887, p. 459. (Museum Practical Geology.) 



1 In the ' Journ. Roy. Microsc. Soc.,' ser. ii, vol. vi, p. 740, this specimen was doubtfully collated 

 with Sowerby's Cythere barbata ('Trans. Geol. Soc.,' ser. 2, vol. v, 1834, p. 131, pi. ix, fig. 1), but this 

 latter was probably a Ci/theridea. See ' Monogr. Tert. Entom.,' 1857, p. 61, footnote. 



2 The generic name has been changed, owing to priority of use, from Polycheles to Darwinella and 

 Darwinula (see 'Quart. Journ. Geol. Soc.,' vol. xli, 18S5, p. 346). 



