416 
THE VOYAGE OF H.M.S. CHALLENGER. 
numerous, ventricose, arranged in two, inequilateral, regularly alternating series. Aper- 
ture a nearly erect loop-like slit on the inner face of the final segment. Length, 
inch (1'3 mm.). 
This variety, which attains somewhat larger dimensions than most of its congeners, 
occurs in company with other Buliminince at two localities in the South Pacific, not far 
from the Island of Juan Fernandez, depth 1375 fathoms and 1825 fathoms respectively; 
and at one point in the Indian Archipelago, off the Ki Islands, 129 fathoms. 
Virgulina subdepressa , n. sp. (PI. LII. figs. 14-17). 
Test elongate, subcylindrical, more or less compressed ; oral end obtuse, rounded 
or subangular ; aboral extremity broad and rounded ; margin crenulate. Segments 
numerous, triangular in lateral aspect, slightly inflated ; arranged in two inequilateral 
alternating series. Aperture an oblique or nearly erect loop-like slit, on the inner face 
of the final chamber. Length, -^§-th inch (1 mm.). 
Under this specific name have been grouped a series of intermediate specimens, which 
it has been found difficult to provide for in any other way. They have, as a rule, stout 
subcylindrical tests, the morphological characters of which bear an almost equal relation 
to those of Virgulina, Bolivina, and Pleurostomella. They differ, however, from Bolivina 
in the somewhat inequilateral arrangement of the segments, and from Pleurostomella in 
the form of the aperture ; and on the whole, find their nearest allies in the narrow and 
less tapering varieties of Virgulina squamosa. 
The specimens referred to were obtained chiefly from one Station in the South Pacific, 
south-west of Juan Fernandez, 1825 fathoms ; and from two in the South Atlantic, mid- 
ocean, 2200 fathoms and 2350 fathoms respectively. 
Bolivina, d’Orbigny. 
Bolivina, d’Orbigny [1839], Reuss, Egger, Parker and Jones, Ivarrer, Carpenter, Brady, 
Schwager, Hantken, Robertson, Vanden Broeck, Wright, &c. 
Vulvulina, pars, d’Orbigny [1839], Carpenter, Seguenza. 
Yirgulina, pars, Reuss [1845], Wright. 
Grammostomum, pars, Ehrenberg [1854]. 
Brizalina, Costa [1856]. 
As already stated in the notice of the genus Virgulina, the allied type Bolivina 
includes the more distinctly biserial modifications of Bulimina. Such forms closely 
resemble the true Textularians, both as to the general contour of the test and the 
arrangement of the chambers ; and their Bulimine affinity is often only recognised by 
the elongate unsymmetrical aperture and its oblique or sub-erect insertion. 
