644 
THE VOYAGE OF H.M.S. CHALLENGER. 
Discorbina valvulata, d’Orbigny, sp. (PL LXXXVII. figs. 5-7). 
Rosalina valvulata , d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 271, No. 4. 
„ ,, Id. 1839, Foram. Cuba, p. 103, pi. iii. figs. 21-23. 
,, ,, Id. 1839, Eoram. Canaries, p. 136, No. 28, pi. ii. figs. 19-21. 
Discorbina valvulata , Jones and Parker, 1872, Quart. Journ. Geol. Soc., vol. xxviii. p. 114. 
D’Orbigny’s figures of Discorbina valvulata represent a somewhat thin outspread test, 
which in point of conformation nearly equally resembles Discorbina globularis and 
Discorbina rosacea, but with the septal lines of the superior face marked by broad 
exogenous bands. The Challenger specimens are more stoutly and compactly built, and in so 
far are more nearly allied to Discorbina globularis. The extreme expression of the typical 
characters is found in the Discorbina binkliorsti 1 of the Maestri cht Chalk, which has a much 
depressed, few-chamberecl test, with the sutural limbation even more strongly developed. 
Discorbina valvulata occurs on the shores of Australia and of the islands of the South 
Pacific, in Hong Kong Harbour, and amongst the West Indies, and the Canaries, — always 
in very shallow water. 
Discorbina obtusa, d’Orbigny, sp. (PL XCI. fig. 9 , a.b.c.T). 
Rosalina obtusa, d’Orbigny, 1846, For. Foss. Vien., p. 179, pi. xi. figs. 4-6. 
Discorbina turbo, var. vesicularis, subvar. obtusa,. Parker and Jones, 1865, Phil. Trans., vol. civ. 
p. 386, pi. xiv. figs. 18, 19. 
The figured specimen, though agreeing well as to contour and segmentation with 
Discorbina obtusa, is by no means typical, the walls being as fine and smooth in texture 
and as minutely foraminated as those of a Pulvinulina. This may be a matter depending 
more or less upon habitat, as the shell from which the drawing was made came from a 
•warmer region and somewhat greater depth than generally affected by the species. 
Such forms occur off Ascension Island, 420 fathoms. Parker and Jones state that the 
species is tolerably plentiful off the Hunde Islands, Davis Strait, at from 28 to 70 
fathoms, commonest at the greater depths. Their figures also represent rather finely 
porous shells ; and I have similar examples from the west coast of Scotland. 
D’Orbigny’s specimens were Miocene fossils from Nussdorf, near Vienna. 
Discorbina rosacea, cl’Orbigny, sp. (PL LXXXVII. figs. 1, 4). 
Rotalia rosacea, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 273, No. 15 Modele, No. 39. 
Asterigerina planorbis, Id. 1846, For. Foss. Vien., p. 205, pi. xi. figs. 1-3. 
„ rosacea, Id. 1852, Prodrome de Paleont., vol. iii. p. 158, No. 2952. 
Rotalina mamilla, Williamson, 1858, Rec. For. Gt. P>r., p. 54, pi. iv. figs. 109-111. 
Discorbina turbo, var. rosacea, Parker and Jones, 1865, Phil. Trans., vol. civ. p. 385, pi. xvi. 
fig. .28, a.b. 
„ rosacea, Parker, Jones, and Brady, 1865, Ann and Mag. Nat. Hist., ser. 3, vol. xvi. 
p. 25, pi. ii. fig. 71. 
1 Rosalind binlchorsti, Reuss, 1861, Sitzungsb. d. k. Ak. Wiss. Wien, vol. xliv. p. 317, pi. ii. fig. 3. 
