664 
THE VOYAGE OE H.M.S. CHALLENGER. 
Truncatulina ungeriana , d’Orbigny, sp. (PL XCIY. fig. 9, a.b.c.). 
Eotalina ungeriana, d’Orbigny, 1846, For. Foss. Vien., p. 157, pi. viii. figs. 16-18. 
„ granosa, Reuss, 1851, Zeitschr. d. deutsch. geol. Gesellsch., vol. iii. p. 75, pi. v. fig. 36. 
„ semipunctata, Bailey, 1851, Smithsonian Contrib., vol. ii., art. 3, p. 11, figs. 17-19. 
Rotalia roemeri, Reuss, 1855, Sifczungsb. d. k. Ak. Wiss. Wien, vol. xviii. p. 240, pi. iv. fig. 52, 
a.b.c. 
„ mortoni, Id. 1861, Ibid. vol. xliv. p. 337, pi. viii. fig. 1. 
Planorbulina ungeriana, Brady, 1864, Trans. Linn. Soe. Lond., voL xxiv. p. 469, pi. xlviii. 
fig. 12. 
„ farcta, var. ungeriana, Parker and Jones, 1865, Phil. Trans., vol. civ. p. 382, 
pi. xvi. figs. 23-25. 
Truncatulina ungeriana, Reuss, 1866, Denkscbr. d. k. Akad. Wiss. Wien, voL xxv. p. 161, 
No. 10. 
As figured by d’Orbigny, the test of Truncatulina ungeriana is comparatively thin, 
the faces unequally convex, and the peripheral edge attenuated or subcarinate. The 
drawing (PI. XCIV. fig. 9) is not a good illustration of the species, the specimen being 
relatively thicker and altogether more stoutly built than the typical form. 
Truncatulina ungeriana is moderately common in the North Atlantic and the 
Mediterranean, at depths of 90 to 600 fathoms ; it occurs sparingly in the South Atlantic 
and off the Cape of Good Hope and more or less characteristic specimens have been 
observed at seventeen Stations in the South Pacific, depth 37 to 2600 fathoms, and at 
one Station in the North Pacific, 2300 fathoms. 
Fossil examples have been found in the London Clay, and in the middle and later 
Tertiaries of Central and Southern Europe. 
Truncatulina robertsoniana, H. B. Brady (PI. XCV. fig. 4, a.b.c.). 
Truncatulina robertsoniana , Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi., N. S., p. 65. 
Test compressed, sublenticular ; superior face slightly convex ; inferior convex, more 
or less depressed at the umbilicus ; peripheral edge subangular. Consisting of four or 
more convolutions, the whole of which are visible on the superior face, whilst on the 
inferior the last whorl conceals all preceding it except a small area in the centre. Seg- 
ments very numerous, thirteen to fifteen in the final convolution ; sutures marked by 
lines only, without superficial constriction. Colour rich brown, deepest near the middle 
of the test and at the sutural lines. Diameter, ^th inch (0'7 mm.). 
A handsome species, distinguished by its compressed contour, its very numerous seg- 
ments and their regular disposition, and its deep brown colour. It has been named 
after one of the most diligent and successful of our marine zoologists, Mr. David Robert- 
son, F.G.S., of Glasgow. 
The finest specimens of Truncatulina robertsoniana are from two West Indian 
