Yol. 50.] HR. P. CHAPMAN ON THE BARGATE BEDS OP STJRKEY. 719 



whorls of semi-globular chambers arranged spirally ; inferior face 

 flat, the surface covered with papillae arranged somewhat concen- 

 trically. Peripheral edge obtuse. Diameter of test ^l inch (0*31 

 mm.) ; height ^j inch (01 mm.). 



One specimen from the Bargate Beds, Holloway Hill. 



Discorbina, Parker & Jones. 



113. Discorbina teebo (d'Orbigny). 



jRotalia (Trochulina) turbo, d'Orbigny, Ann. Sci. Nat. vol. vii. 

 (1826) p. 274, no. 29 : Modele no. 73. 



Discorbina turbo, Brady, ' Challenger' Eep. vol. is. (1884) p. 642, 

 pi. lxxxvii. fig. 8 a, b, c. 



This species has previously been found in the Chalk of Maestricht 

 and some strata of later age ; and as a recent form it is found iu 

 shallow water, and deeper to 420 fathoms. 



One specimen from the Pebble-beds, Littleton. 



114. Discorbina orbicelaeis (Terquem). 



Bosalina orbicularis, Terquem, ' Anim. sur la Plage de Dunkerque,' 

 1876, p. 75, pi. ix. fig. 4 a, b. 



Discorbina orbicularis, Brady, ' Challenger ' Pep. vol. ix. (1884) 

 p. 647, pi. lxxxviii. figs. 4-8. 



Pour specimens of this shallow-water form, which also occurs in 

 Miocene and Pliocene strata, were found in the Pebble-beds, 

 Littleton. 



115. Discorbina pileoees (d'Orbigny). 



Valvulina pileolus, d'Orbigny, ' Poram. Ame'r. Merid.' 1839, 

 p. 47, pi. i. figs. 15-17. 



Discorbina pileolus, Brady, ' Challenger ' Eep. vol. ix. (1884) 

 p. 649, pi. lxxxix. figs. 2-4. 



D. pileolus has been found fossil in various Tertiar}- deposits. As 

 a living form it affects shallow water down to 20 fathoms. 



Two specimens from the Pebble-beds, Littleton. 



116. Discorbina paeisiensis (d'Orbigny). 



Bosalina parisiensis, d'Orbigny, Ann. Sci. Nat. vol. vii. (1826) 

 p. 271, no. 1 : Modele no. 38. 



Discorbina parisiensis, Brady, 'Challenger' Rep. vol. ix. (1884) 

 p. 648, pi. xc. figs. 5, 6, 9-12. 



This species is found in shallow water to a depth of 50 fathoms, 

 and is recorded fossil from Tertiary strata. 



Three specimens from the Pebble-beds, Littleton ; and two from 

 the Pebble-beds, Halfpenny Lane. 



117. Discoebina eosacea (d'Orbigny). 



Botalia rosacea, d'Orbigny, Ann. Sci. Nat. vol. vii. (1826) p. 273, 

 no 15 : Modele no. 39. 



