Recent and Fossil Foraminifera. 429 



Cristellaria subarcuatula var- scapha Williamson, 1858, Recent Foram. Gt. 



Britain, p. 30, pi. ii. figs. 60, 61. 

 Cristellaria italica (Defrance) Brady, 1S84, Foram. ' Challenger,' p. 544, pi. 



lxviii. figs. 17, 18, 20-3. 

 Ditto. (Defrance) Brady, 1887, Synopsis British Becent Foraminifera. 



Fossil only. One good and typical specimen, of medium size. 



116. Cristellaria rotulata Lamarck sp. 



Lenticulites rotulata Lamarck, 1804, Ann. Mus., vol. v. p. 188, No. 3 ; and 



1806, vol viii. pi. lxii. fig. 11. 

 Cristellaria rotulata (Lamarck) d'Orbigny, 1840, Mem. Soc. Geol. France, 



ser. 1, vol. iv. p. 26, pi. ii. figs. 16-18. 

 Cristellaria cal 'car (Linne) typlca Williamson, 1858, Becent Foram. Gt. Britain, 



p. 27, pi. ii. figs. 52, 53. 

 Cristellaria rotulata (Lamarck) Brady, 1884, Foram ' Challenger,' p. 547, 



pi. Ixix. fig. 13 a, b. 

 Ditto. (Lamarck) Brady, 1887, Synopsis British Recent Foraminifera, 

 Ditto. (Lamarck) Goi : s, 1894, Arctic and Scandinavian Foraminifera, p. 60, 



pi. x. figs. 559-78. 



Fossil and recent. All the specimens are small ; the largest 

 recent specimen is somewhat abnormal, and is characterised by a 

 very large primordial chamber. The fossil specimens have the 

 appearance of being derived from the London Clay. 



117. Cristellaria crassa d'Orbigny. 



Cristellaria crassa d'Orbigny, 1846, Foram. Foss. Yienne,p. 90, pi. iv. figs. 1-3. 

 JRobulina deformis Reuss, 1851, Zeitschr. d. deutsch. geol. Gesell., vol. iii. 



p. 70, pi. iv. fig. 30. 

 Cristellaria crassa (d'Orbigny) Brady, 1884, Foram. ' Challenger,' p. 549, pi. 



lxx. fig. 1 a, b. 



One fossil specimen, apparently derived from the Chalk. The 

 species, according to Brady, is very rare in the recent condition. It 

 occurs more frequently in many later Tertiary deposits. 



118. Cristellaria nitida d'Orbigny. 



Cristellaria nitida d'Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 291, No. 5. 

 Cristellaria cassis (pars) (Fichtel and Moll) Parker, Jones, and Brady, 1871, 



Ann. and Mag. Nat. Hist., ser. iv. vol. viii. p. 244, pi. x. fig. 88. 

 Cristellaria nitida (d'Orbigny) Brady, 1884, Foram. ' Challenger,' p. 549, pi. 



lxx. fig. 2 a, b. 



Fossil. One specimen, from a clay. The carina is slightly 

 serrate. 



