REPORT ON THE FORAMINIEERA. 
249 
and, as already stated, nearly pure white, but in old specimens of large dimensions it is 
often partially coated by a superficial brownish deposit. The test is more or less flexible, 
and its consistence is such that it is easily cut with a sharp knife. The interior forms a 
cylindrical cavity of nearly even diameter, with smoothly finished surface. During life 
the tube is filled with dark-coloured or almost black sarcode. 
The minute structure of the test is closely analogous to that of Pilulina. It is com- 
posed almost entirely of interlacing sponge-spicules and fine siliceous sand, differing how- 
ever from Pilulina in one point, namely, that the spicules appear to be employed chiefly, 
though not exclusively, on the inner portion of the wall, the outer surface being made up 
of finer materials (fig. 1 8). There is the same apparent absence of cement as in the allied 
genera, and acids have but little effect on the test. There is no evidence whatever of 
definitely organised structure, such as would be presented by a sponge ; there are no visible 
pores, and no oscula. Though some selective power is manifestly exercised, there is a 
wonderful variety amongst the spicula employed in the construction of the test ; and Mr. 
Norman states in a letter on the subject, that in disintegrating a single specimen he has 
counted as many as nineteen of the forms enumerated in Bowerbank’s list, not one of 
which could be said to be predominant or characteristic. 
Bathy siphon jiliformis is a rare species, and has only been met with at one Challenger 
locality, Station 195, off Banda, Amboyna, 1425 fathoms. It appears to be plentiful in 
the Hardanger Fiord (M. Sars, G. 0. Sars, Norman), and occurs in deep water in the Bay 
of Biscay (Norman, de Folin). 
I am indebted to my friend the Rev. A. M. Norman for the specimens figured in 
PL XXVI., as well as for the supply that has enabled me to work out the general 
characters and structure of the test. 
Sub-family 3. Saccammininse. 
Psammosphcera, Schulze. 
Psammosphcera, Schulze [1874], Brady, Norman, Haeusler. 
Test free or attached, typically spherical, with no visible aperture. Only one species. 
Psammosphcera fuscci, F. E. Schulze (PI. XVIII. figs. 1-8). 
Psammosphcera fusca, Schulze, 1874, II. Jahresberichte d. Komm. Untersuch. d. deutsch. Meere, 
p. 113, pi. ii. fig. 8, a. f. 
,, „ Brady, 1879, Quart. Journ. Micr. Sci., vol. xix. N. S., p. 27, pi. iv. figs. 1, 2. 
,, ,, Haeusler, 1883, Quart. Journ. Geol. Soc., vol. xxxix. p. 26, pi. ii., fig. 1. 
Test free or attached, spherical or nearly so ; exterior rough and coarsely arenaceous, 
