8 GEORGE BUSK, 
in a thick tuft of very fine tubules or hollow fibres, each of 
which is individually affixed to an empty glodigerina shell, or 
to some other Foraminifer. And there is the same complete 
constriction between the stem and the membranous expan- 
sion forming the bottom of the infundibular cup. The zocecia 
differ from those of A. cyathus in having no spine on the 
upper and outer angle, and in having the avicularium 
attached by a distinctly articulated peduncle to the outer 
border rather above the middle and without any project- 
ing process for its reception. Posteriorly, the zoewcia are 
irregularly oblong, the outer border being sharp and nearly 
straight, and the inner as it were gibbous. The surface, as 
in K. cyathus,is perfectly even and smooth, and very convex. 
In many of the zoccia, more especially towards the lower 
end of the branches, a small tubercular projection rises from 
the upper border of the zowciwm (fig. 2) in the middle, 
which would seem to correspond to the “horny conical 
process” in the same situation noticed by Koren and 
Danielssen, and supposed by them to serve for the attach- 
ment of a muscle; but it is clearly nothing of the kind, 
and, aS it seems to me, merely a rudimentary oecium. In 
EK. pocillum these organs are much smaller than in &. 
cyathus, but, as in that species, cucullate in form. They 
differ, however, very markedly in the direction in which the 
opening looks, which, in A. cyathus, is directly downwards, 
and the K. pocillum obliquely outwards and downwards. 
In the interior of the zoecia the arrangements are of the usual 
kind, except in the presence of the additional fan- or rather 
brush-shaped flexor muscle, which, in this species, is of larger 
size or more developed than it is in KH. cyathus (fig. 2.). 
The additional muscle connected with the insertion of the 
avicularium is absent in K. pocillum. Besides these parts, 
there may be also seen within the base of the zoecium 
behind, an apparently chitinous process of irregular figure, 
and probably hollow. It springs apparently very close to the 
spot whence the radical tubes arise, and may have some con- 
nection with them. Koren and Danielssen notice a similar 
process in A. Smittiz, and I have seen it occasionally of 
smaller size than in K. pocillumin K. cyathus. Iam unable 
to define its function, but it most certainly does not serve as 
the point of attachment for a muscle as supposed by Koren 
and Danielssen. 
In K. pocillum the avicularium is of larger size, and wider 
in proportion to its length than in K. cyathus, resembling 
in that respect the avicularium of XH. arborescens, but other- 
wise they are alike, both containing, besides the usual 
