REPORT ON THE FORAMINTFERA. 
255 
Saccammina socialis, n. sp. (PL XVIII. figs. 18, 19). 
Test consisting of several independent arenaceous chambers, individually spherical or 
subspherical in shape and of nearly even size, attached to each other by their outer sur- 
faces, but without stoloniferous intercommunication, each chamber having its own external 
aperture. Spheres seldom more than six or eight in number, and usually arranged with 
more or less regularity. Texture finely sandy, nearly smooth externally. Diameter of 
the individual chambers ^yth inch (O' 8 mm.) or less. 
This is a very rare variety, and so far as can be determined from the few specimens 
which are known, appears to represent a colony of individuals rather than a true poly- 
thalamous organism. The chambers are smaller than those of Saccammina sphcerica, 
and present a comparatively smooth exterior ; the walls are thin and built of nearly 
uniform fine sand, and the test is grey, or at least devoid of the rich brown colour of the 
typical species. 
Saccammina socialis has only been found at one Challenger Station, namely, No. 246, 
North Pacific, 2050 fathoms. In Dr. Carpenter’s collection are one or two specimens 
from the North Atlantic, south of Rockall Bank, 1263 fathoms. 
Sub-family 4. Rhabdammininse. 
Jaculella , H. B. Brady. 
Juculella, Brady [1879]. 
Test free, elongate, cylindrical, tapering ; aperture at the broad end ; texture coarsely 
arenaceous, rough externally. 
Jaculella is only known as a recent genus. The details of its structure and 
geographical distribution may be gathered from the notes appended to the two species 
which follow. 
Jaculella acuta , H. B. Brady (PI. XXII. figs. 14-18). 
Jaculella acuta, Brady, 1879, Quart. Journ. Micr. Sci., vol. xix. N. S., p. 35, pi. iii. figs. 12, 13. 
Test elongate, tubular, straight or nearly so ; closed and pointed at one extremity, 
gradually increasing in width towards the other, which, slightly constricted and rounded, 
but otherwise open, forms the general aperture. Texture coarsely arenaceous, very 
compact and hard ; exterior surface rough, interior also rough but in a less degree. Colour 
rich brown in the earlier portion of the test, becoming gradually lighter towards the wide 
end. Length very variable, sometimes 1 inch (25 mm.) or even more 
