Vol. 50.] ME. F. CHAPMAN ON THE BARGATE BEDS OF SURREY. 701 



30. Gaudrtina filiformis, Berthelin. 



G. filiformis, Berthelin, Mem. Soc. geol. France, ser. 3, vol. i, 

 (1880) no. 5, p. 25, pi. i. fig. 8. 



This form was first described from the Gault of France, and has 

 subsequently been found in the English Gault. 



One specimen from clay of Bargate Pebble-beds, Littleton. 



Valvulina, d'Orbigny. 



31. Valvulina conica, Parker & Jones. 



V. triangularis, var. conica, Parker & Jones, Phil. Trans. Roy. 

 Soc. vol. civ. (1865) p. 406, pi. xv. fig. 27. 



V. conica, Brady, 'Challenger' Pep. vol. ix. (1884) p. 392, 

 pi. xlix. figs. 15, 16. 



This species has been recorded from the Gaidt, and is also found 

 living at the present time. 



One specimen from Bargate Beds, Holloway Hill. 



32. Valvtjlina ftjsca (Williamson). 



Rotalina fusca, Williamson, ' Rec. For. Gt. Br.' 1858, p. 55, pi. v. 

 figs. 114, 115. 



Valvulina fusca, Brady, ' Challenger ' Rep. vol. ix. (1884) p. 392, 

 pi. xlix. figs. 13, 14. 



V. fusca has been found in the Gault, otherwise, like the preced- 

 ing species, it was known only from recent gatherings. 



Three specimens from Bargate Pebble-beds, Littleton ; they are 

 not attached, but they plainly show their adherent character. 



Btjlimina, d'Orbigny. 



33. Br/LiMiNA poltstropha, Reuss. (PL XXXIY. fig. 5.) 



B. polystropha, Reuss, ' Verstein. bohm. Kreid.' pt. ii. (1845) 

 p. 109, pi xxiv. fig. 53 a, b. 



This species is perhaps one of the most interesting and important 

 of the foraminifera found in the Bargate series, since it throws 

 some light on the actual position of the specimens found by Reuss 

 in the Chalk of Bohemia. The Bargate specimens are somewhat 

 coarsely arenaceous, with a rough surface, triserial, and they have 

 the aboral end distinctly twisted as in Reuss's figure ; moreover, 

 the aperture is clearly that of a Bulimina, being comma-shaped. 

 The figure given by Reuss (loc. cit.) is misleading, since the 

 surface of the test is depicted as being smooth, although in the 

 description of the species it is stated to be rough. The form re- 

 ferred to in the Monographs of the Gaidt Foraminifera of Montcley 1 

 and Folkestone 2 as Bulimina polystropha, Rss., I am now inclined 



1 Berthelin, Mem. Soc. geol. France, ser. 3, vol. i. (1880) no. 5, p. 30, pi. ii. 

 fig. 3 a, 6. 



2 Chapman, Journ. Roy. Micr. Soc. 1892, p. 756, pi. xii. fig. 11. 



