704 
THE VOYAGE OE H.M.S. CHALLENGER. 
littoral sands, and may be met with at every depth down to nearly 3000 fathoms. The 
first appearance of the genns geologically is in the Gault of Kent; it becomes compara- 
tively common in the White -Chalk, and increases in frequency at the successive stages of 
the Tertiary era. 
Rotalia beccarii, Linne, sp. (PI. CVII. figs. 2, 3). 
“Cornu Hammonis,” Plancus, 1739, Conch. Min., p. 8, pi. i. fig. 1, A.'B.C. 
“Ammonia unita,” Gaultieri, 1742, Index Test., pi. xix. figs. II. I. 
Nautilus beccarii, Linne, 1767, Syst. Nat, 12th,ed., p. 11.62 ; — 1788, Ibid., 13th (Gmelin’s) ed., 
p. 3370, No, 4. 
“Hammoniee conico-tuberculatas,” Soldani, 1789, Testaceographia, vol. i. pt. 1, p. 56, pi. xxxv. 
fig. P. 
“Hammonhe globoso-rotundatse,” Id. 1798, Ibid., vol. ii., App., p. 139, pi. ii. 
figs. /. F. G, 
Discorbula ariminensis, Lamarck, 1816, Tabl. Encycl. et Meth., pi. cccclxvi. fig. 6, alb. 
Streblus beccarii, Fischer, 1819, Adversaria Zoologica, fasc. ii. p. 75. 
Rotalia ( Turbinulina ) beccarii, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 275, No. 42; — 
Modble, No. 74. 
,, corallinarim, Id, Ibid. p. 275, No. 48; — Modele, No. 75. 
„ ,, tortuosa, Id. Ibid. p. 275, No. 40. 
Rotalitcs discorbula, Defrance, 1827, Diet Sci. Nat., vol. xlvi. p. 303. 
Rosalina parkinsoniana, d’Orbigny, 1839., Foram. Cuba, p. 105, pi. iv, figs. 25-27. 
; , cateshyana, Id, Ibid. p. 105, pi. iv. figs. 22-24. 
„ viennensis, Id. 1846, For. Foss. Vien., p. 177, pi. x. figs. 22-24. 
„ amaliae, Costa, 1856, Atti dell’ Accad. Pont., vol. vii. p. 254, pi. xxi. fig. 12, A.-C. 
„ radiata, Id. Ibid. p. 255, pi. xxi. fig. 13, A.-C. 
Rotcdina beccarii, Williamson, 1858, Rec. For. Gt. Br., p. 48, pi. iv. figs. 90-92. 
Rosaliria ryaclteyi, Karrer, 1864, Novara-Exped., geol. Theil, vol. i. pt. 2, p. 82, pi. xvi. fig. 14. 
Rotalia beccarii, Parker and Jones, 1865, Phil. Trans., vol. civ. p. 388, pi. xvi. figs. 29, 30. 
Rosalina. maremii, Terquem, 1878, Mem. Soc. gbol. France, sbr. 3, vol. i. p. 27, pi. vii. 
fig. 15. 
,, tro.cheata, Id Ibid. p. 28, pi. vii. fig. 18. 
Rotalia punctato-granulosa, Seguenza, 1879, Atti dell’ R. Accad. dei Lincei, ser. 3, vol. vi. p. 147, 
pi. xiii. fig. 37. 
Rotalia beccarii, Terrigi, 1880, Atti dell’ Accad. Po-ntif., ann. xxxiii. p. 208, pi. iii. fig. 62 ; 
pi. iv. figs. 63-66. 
Rotalia beccarii, the central species of the genus from a morphological point of view, 
and by far the best known, is not well represented in the Challenger collections. 
In its typical presentment the test forms a depressed turbinoid spire, the two faces 
of which are nearly equally convex, and the peripheral edge rounded and more or less 
lobulatecl. The segments, which are numerous and a little inflated, are arranged in 
three to four convolutions ; on the superior face the sutures are flush or very slightly 
depressed, and marked by the broad lines of the thick clear septa within; whilst on the 
inferior they are irregularly excavated, and their borders, as well as the umbilical portion 
of the surface, are studded with irregular exogenous granules. The septa of well- 
