REPORT ON THE FORAMINIFERA. 
153 
cally identical, but strikingly different in point of size. Dr. Karrer, in bis memoir on 
the Miocene Foraminifera of Kostej in the Banat, loc. cit., accurately describes the smaller 
of these, which is represented by fig. 14, as resembling Spiroloculina tenuis in general 
form, but having a rough, sandy exterior. The recent specimens, however, are often 
even smaller than those of the smooth-shellecl species alluded to, -g^th inch (0'4 mm.) being 
about their average length. The larger variety (fig. 13), on the other hand, sometimes 
attains a length of ^th inch (3'0 mm.), and is proportionately broad. 
The two varieties are found in similar localities, in comparatively shallow water in the 
tropics, as follows : — Admiralty Islands, at two Stations, 16-25 fathoms ; Ki Islands, 129 
fathoms; Humboldt Bay, Papua, 37 fathoms; Philippine Islands, 95 fathoms. 
A few specimens of a form having intermediate characters (PI. VIII. fig. 11), related 
apparently to both Spiroloculina asperula and Spiroloculina arenaria, have been met 
with in much deeper water (542 fathoms), in one of the “ Porcupine ” dredgings in the 
warm area of the Faroe Channel. These are retained provisionally under the present 
species, but it is possible they may represent a complanate or outspread variety of 
Miliolina agglutinans , which in its typical condition is not uncommon in the same area. 
Spiroloculina arenaria, n. sp. (PI. VIII. fig. 12). 
Test oblong or oval, complanate ; extremities obtusely angular or slightly rounded, 
peripheral edge rounded ; segments few and broad, indistinct externally. Aperture 
small, circular, with Milioline tongue ; situated in a slightly produced shelly neck. 
Exterior sandy ; length, |*gth inch (1*7 mm.). 
This species is distinguished from Spiroloculina asperula by its stouter propor- 
tions, the comparatively small number of its segments, and their relatively greater width. 
The septation is obscured by the sandy texture of the test, but as far as can be judged 
from the exterior, the two' segments forming the peripheral whorl each occupy about 
one-third of the entire width of the shell. 
Spiroloculina arenaria i occurs at three of the Challenger Stations, namely, off Kandavu, 
Fiji Islands, 210 fathoms ; off Paine Island, Torres Strait, 185 fathoms; and amongst 
the Philippine Islands, 95 fathoms. 
Spiroloculina tenuiseptata, n. sp. (PL X. figs. 5, 6). 
Test complanate, elongate-oval ; extremities tapering, subangular, peripheral edge 
square or rounded. Segments numerous, narrow, arched, tubular ; the successive con- 
volutions separated by deep depressions on both sides of the test, the interspace being 
occupied by a thin horizontal, shelly septum, which is sometimes wanting between the 
later chambers. Aperture simple, circular. Length, -^nd inch (P2 mm.). 
