692 
THE VOYAGE OF H.M.S. CHALLENGER. 
with the normal form at one point in the North Atlantic and at one in the South Pacific. 
It occurs in bottom-dredgings from three Stations in the North Atlantic, from four in the 
South Atlantic, and from one in the South Pacific. 
Pulvinulina tumida, H. B. Brady (PL CIII. figs, 4-6). 
Pulvinulina menardii, var. tumida , Brady, 1877, Geol. Mag., Dec. II. vol. iv. p. 294. 
,, „ „ Id. 1879, Quart. Journ. Micr. Sci., voL xix., N. S., p. 80. 
Pulvimdina tumida is probably only a variety of Pulvinulina menardii, but the test 
is stouter and altogether more solidly built. Its general contour is oblong, both the 
superior and inferior faces are highly convex, and the peripheral edge thick or rounded, 
and little if at all constricted at the sutures ; on the inferior face the segments are more 
or less inflated and the umbilicus sunken ; the longer diameter is about -^th inch 
(1 mm.). 
This form was taken in the tow-net on three occasions, twice in the North Atlantic 
and once in the South Atlantic. 
Its presence has been determined in bottom-dredgings from seven Stations in the 
North Atlantic, 450 to 2750 fathoms; from nine in the South Atlantic, 420 to 2475 
fathoms ; from eleven in the South Pacific, 20 to 2600 fathoms ; and from two in the 
North Pacific, 500 to 1850 fathoms. Of these the most northerly is Station 45, lat. 38° 
34' N., the most southerly Station 323, lat. 35° 39' S. ; but with a few exceptions the 
points referred to are all within the tropics. 
A few specimens were found with other Foraminifera in a piece of white limestone 
from the New Britain group, the precise geological age of which has not been determined, 
but otherwise the species has not been recognised in the fossil condition. 
Pulvimdina canariensis, d’Orbigny, sp. (PI. CIII. figs. 8-10). 
Rotalina canariensis, d’Orbigny, 1839, Eoram. Canaries, p. 130, pi. i. figs. 34-36. 
Pidvinulina repanda, var. menardii, subvar. canariensis, Parker and Jones, 1865, Phil. Trans., 
vol. civ. p. 395, p. 16, figs. 47^49. 
,, canariensis, Owen, 1876, Journ. Linn. Soc. Lond., vol. ix., Zool., p. 148, pi. v. 
fig. 21. 
,, ,, Brady, 1879, Quart. Journ. Micr. Sci., vol. xix., N. S., p. 80. 
„ „ Terrigi, 1880, Atti dell’ Accad. Pontif., ann. xxxiii. p. 207, pi. iii. 
figs. 59, 60. 
Pidvimdina canariensis may be treated as a feeble modification of Pidvinulina 
menardii. The test is smaller than that of the type, the two lateral faces are nearly 
equally convex, and the periphery is acute or subcarinate ; it has usually only four or 
five segments in the outer whorl, and they are so combined that the ends project 
considerably at the margin ; there is but little sutural limbation, frequently none. 
