118 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
This variety would appear to be rare, judging from the Challenger 
investigations, as Professor Brady mentions but four localities, two 
each from the North and South Atlantic and Pacific oceans. Dr. 
C. Schwager’s specimens came from the Pliocene of Nicobar Islands. 
This form was found at Station H. 4502, and was abundant at Sta- 
tion H. 4555. 
BILOCULINA IRREGULARIS d’Orbigny. 
Biloculina irregularis D’ORBIGNY, Foram. Amer. Merid., 1839, p. 67, pl. vit, 
figs. 22-24. 
This species does not reveal the characteristic biloculine habit of 
growth in its adult stage, but the test is globose and there are two 
major segments in the final development which are similar to Bilo- 
culina bulloides in their shape and position. The asymmetry ap- 
pears from the third segment, cutting one side obliquely like Poly- 
morphina types and appearing as a faint line on the outer surface 
of the shell neither depressed nor elevated. 
Biloculina ventricosa Reuss, is the same as this species, which can 
be distinguished from Biloculina sphaera by its milioline aperture 
and the extension of the ultimate chamber. 
The Challenger dredged this foraminifer from the neighborhood 
of the Canaries in 1,125 fathoms; off Sombrero Island, 450 fathoms; 
south of Pernambuco, 350 fathoms, and in mid-ocean in the South 
Atlantic from 1,415 fathoms. It was also obtained near the Fiji, 
Tahiti, and Papua islands at depths of 610, 620, and 1,070 fathoms, 
respectively. The Albatross found it only at Station 4696, where it 
was rare. 
The Septaria clays of Hermsdorf near Berlin and the salt beds of 
Wieliczka have furnished the species among other fossil Forami- 
nifera. 
BILOCULINA ELONGATA d’Orbigny. 
Biloculina elongata v’ORBIGNY, Ann. Sci. Nat., VII, No. 4, 1826, p. 298. 
Test resembling Biloculina ringens in outline and aperture but 
longer and much narrower, as the name implies. The species appears 
to be the equivalent of Bioculina bougainvillet and B. patagonica of 
@Orbigny. The shell shows considerable variation, chiefly in 
amount of elongation and globosity. 
Unlimited in distribution and depth, but most abundant in the 
South Pacific. Specimens were obtained at Stations D. 4017, D. 
4025, and H. 4567. 
