142 
THE VOYAGE OF H.M.S. CHALLENGER. 
Offenbach, for a somewhat different variety, apparently related to the less compressed 
forms of Biloculina irregularis. 
Biloculina sphcera is found in all the great ocean basins, though it can scarcely be 
regarded as a common species. In the North and South Atlantic and South Pacific it 
is by no means unfrequent, but it is more sparingly distributed in the North Pacific and 
Indian Oceans. Its bathymetrical range extends from shallow water down to 2300 
fathoms, but it is rare at greater depths than 1000 fathoms. 
It occurs as a Tertiary fossil in the Septaria- clays of several districts in North 
Germany. 
Biloculina bulloides, d’Orbigny (PI. II. figs. 5, 6). 
“Concbula minima,” &c., Plancus, 1739, De Conch, min. not., p. 23, pi. ii. fig. 6. 
Biloculina bulloides, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 297, No. 1, pi. xvi. figs. 1-1. 
Module, No. 90. 
,, peruviana, Id., 1839, Foram. Amer. Merid., p. 68, pi. ix. figs. 1-3. 
„ ringens, Parker, Jones and Brady, 1865, Ann. and Mag. Nat. Hist., ser. 3, vol. xvi. 
p. 35. 
,, lucernula , Schwager, 1866, Novara -Exped., Geol. Tlieil., vol. ii. p. 202, pi. iv. 
fig. 17, a, b. 
D’Orbigny ’s figure of Biloculina bulloides in the Annales des Sciences serves as a 
useful type for a group of thick-shelled, subglobular Bilocidince affecting moderately deep 
water. The specimens are characterised by having inflated segments, a small circular 
aperture, generally though not invariably placed on the slightly produced or tubular end 
of the final segment, and a somewhat coarse shell with roughish exterior. 
The species is common in the North Atlantic, but comparatively rare in other seas. 
It is at its best at depths of from 300 to 1000 fathoms, though small examples are 
occasionally found as low down as 2750 fathoms. It occurs at one of the Challenger 
Stations in the South Atlantic, and at one in the South Pacific, in either case at a depth 
of more than 2000 fathoms; oft' the Cape of Good Hope, 150 fathoms; and in two 
localities amongst the islands south of New Guinea, in comparatively shallow water. 
Biloculina ringens, Lamarck, sp. (PI. II. figs. 7, 8). 
“Frumentaria Ovula,” Soldani, 1795, Testaceograpkia, vol. i., part 3, p. 228, pi. cliii. fig. S. 
Miliolites ringens, Lamarck, 1804, Ann. du Museum, vol. v. p. 351 ; vol. ix., pi. xvii. fig. 1. 
Biloculina ringens, d’Orbigny, 1826, Ann. Sci. Nat,, vol. vii. p. 297, No. 2. 
,, canariensis, Id., 1839, Foram. Canaries, p. 139, pi. iii. figs. 10-12. 
,, clypeata, Id., 1846, For. Foss. Vien., p. 263, pi. xv. figs. 19-21. 
,, simplex, Id., Ibid., p. 264, pL xv. figs. 25-27. 
,, turgida, Reuss, 1851, Zeitschr. d. deutsch. geoL Gesell., vol. iii. p. 85, pi. vii. fig. 55. 
„ ringens, Williamson, 1858, Rec. For. Gt. Br., p. 79, pi. vi. figs. 169, 170. 
„ „ Jones, Parker and Brady, 1866, Foram. Crag, p. 5, pi. iii. figs. 26-28. 
The extreme variability of Biloculina ringens in respect of the size and form of the 
