434 
THE VOYAGE OF H.M.S. CHALLENGER. 
Elirenbergina serrata, Reuss (PL LY. figs. 2-7). 
Ehreribergina serrata, Reuss, 1849, Denkschr. d. k. Akad. Wiss. Wien, vol. i. p. 377, pi. xlviii. 
fig. 7, a.-c. 
Prof. Reuss’s figures ( loc . cit.), though tolerably characteristic, represent only a poor 
specimen of this somewhat variable species. The salient character of Elirenbergina 
serrata, that by which it is distinguished from Elirenbergina pupa, consists in the 
extension outwards of the lateral margins of the chambers, so as to form projecting angles, 
in consequence of which the test presents a serrate outline. In some cases the angles 
terminate in slightly deflected points, as shown in PL LV. figs. 2, 3, but in others they are 
much produced, and take the shape of long horizontal spines, as in figs. 6, 7. Nor is this 
all. In Reuss’s drawings the ventral faces of the segments are inflated and rounded in 
much the same way as those of Elirenbergina pupa ; but in well-developed examples the 
convex face as well as the margin of each: chamber is drawn out to a point' so that there 
are two rows of short spines on the ventral face of the test, one row at each side of the 
depressed median line. 
The dorsal side of the shell is smooth and shows very distinctly the regular, alternate 
arrangement and interdigitation of the segments. There are no depressions on the septal 
lines, and the surface is free from spines or other excrescences. 
It is singular that Elirenbergina serrata has not before been recorded as a recent 
species ; for, though it can scarcely be classed amongst common Foraminifera, it occurs 
at intervals over a very wide area. Amongst the Challenger gatherings it has been identified 
at two localities in the North Atlantic : — off the Azores, 450 fathoms, and off the 
Canaries, 620 fathoms ; at two in the South Atlantic, in mid-ocean, 1025 fathoms 
and 2350 fathoms respectively ; and at one in the North Pacific, 2340 fathoms. In 
the South Pacific it is comparatively frequent, having been found at no less than ten 
Stations, varying in depth from 150 to 2075 fathoms. 
The species was originally described from fossil specimens obtained by Reuss from the 
Miocene of Baden near Vienna, and Karrer reports its occurrence also at Nussdorf, in 
the same vicinity. 
Elirenbergina liystrix, H. B. Brady (Pl. LV. figs. 8-11). 
Elirenbergina liystrix, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi., N. S., p. 60. 
Test biserial, earlier portion more or less coiled ; somewhat ovate in general contour, 
distal end broad and arched. Segments few ; regular and alternate in their dorsal 
aspect, confused on the ventral face ; their free peripheral ends drawn out into lateral 
spines. The sutural lines of the earlier segments on the dorsal face marked with rows 
of spines, which sometimes coalesce so as to form fringe-like projections ; the ventral 
