. Recent and Fossil Foraminifera. 695 



Potystomella Lamarck. 

 215. Polystomella striatopunctata Fichtel and Moll sp. 

 (Plate XXI. fig. 2 a, b, c.) 



Nautilus striatopunctatus Fichtel and Moll, 1803, Test. Micr., p. 61, pi. ix. 

 figs, a, b, c. 



Polystomella poeyana d'Orbigny, 1839, Foram. Cuba, p. 75, pi. vi. figs. 25, 26. 



Polystomella umbilicatula Williamson, 1858, Recent Foram. Gt. Britain, p. 42, 

 pi. iii. figs. 81, 82. 



Polystomella umbilicatula var. incerta Williamson, ibid., p. 44, pi. iii. fig. 82a. 



Polystomella striatopunctata (Fitchel and Moll) Parker and Jones, 1860, Ann. 

 and Mag. Nat. Hist., ser. iii. -vol. v. p. 103, No. 6. 



Polystomella autonina (d'Orbigny) Terquem, 1S82, Mem. Soc. geol. France, 

 ser. 3, vol. ii No. 3, p. 47, pi. ii. fig. 25 a, b. 



Polystomella striatopunctata (Fichtel and Moll) Brady, 1884, Foram. ' Chal- 

 lenger,' p. 733,pl.cix. figs. 22, 23. 



Ditto. (Fichtel and Moll) Brady, 1887. Synopsis British Recent Forami- 

 nifera. 



Ditto. (Fichtel and Moll) Goes, 1894, Arctic and Scandinavian Forami- 

 nifera, p. 101, pi. xvii. figs. 815, 816. 



Very common, both recent and fossil, and presenting practically 

 every modification of this variable type. Among the recent speci- 

 mens many of the largest present a modification of the usual struc- 

 ture — which we have thought of sufficient interest to figure. The 

 shell is of a complanate and evolute type, and somewhat excavate 

 at the umbilicus, which is more or less filled in with a vesicular 

 extension of the final whorl of chambers, thus presenting as it were 

 a secondary deposit of chamberlets in the middle of the shell. This 

 variety also occurs in some abundance at Bognor. 



216. Polystomella crispa Linne sp. 



Nautilus crispus Linne, 1767, Syst. Nat., 12th ed. p. 1162, 275. 



Polystomella crispa (Linne) Lamarck, 1822, Anim. sans Vert., vol. vii. p. 625. 



No. 1. 

 Ditto. (Linue) Williamson, 1858, Recent Foram. Gt. Britain, p. 40, pi. iii. 



figs. 78-80. 

 Ditto. (Linne) Brady, 1884, Foram. « Challenger,' p. 736, pi. ex. figrs. 6, 7. 

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

 Ditto. (Linne) Goes, 1894, Arctic and Scandinavian Foraminifera, p. 102, 



pi. xvii. figs. 820, 821. 



Abundant, both recent and fossil, and in all stages of develop- 

 ment. The spinous, young specimens are particularly fine. 



The range of this handsome species extends back at least as 

 far as Eocene times, and it is of frequent occurrence in most later 

 deposits. 



3 a 2 



