REPORT OR THE FORAMINIFERA. 
271 
The test assumes very various shapes, but it is always more or less asymmetrical, 
and has tubular branches diverging from different points without regularity. The 
walls are of the same coarse hard texture as those of the typical species. It is one 
of the few arenaceous Foraminifera in which the chitinous lining immediately surrounding 
the sarcode is sometimes found protruding beyond the apertures of the test, a condition 
well shown in figs. 11, 12. 
Rhabdammina cornuta has been observed at five localities, three of which are in the 
North Atlantic, namely, — south of the Rockall Bank, 1215 fathoms, off the west coast of 
Ireland, 816 fathoms, and in the warm area of the Faroe Channel, 532 fathoms. The 
remaining two are Challenger Stations : — No. 122, South Atlantic, south-east of 
Pernambuco, 350 fathoms ; and No. 168, east of New Zealand, 1100 fathoms. 
Aschemonella, H. B. Brady. 
Astrorhiza, pars, Norman [1876], Brady. 
Aschemonella , Brady [1879], Biitsclili. 
Test free ; consisting either of a number of segments arranged in single or branching 
series, or of a spuriously segmented branching tube ; chambers tubular or inflated, 
unequal in size and irregular in contour, generally presenting numerous stoloniferous 
apertures. Walls arenaceous, comparatively thin, firmly cemented. 
The characteristic features of the genus Aschemonella are the great variety of shape 
exhibited by the segments, their irregularity and want of symmetry, and the extreme 
tenuity of the walls of the test in comparison with the bulk of the sarcode-cavities, 
especially in the larger specimens. It is almost the only genus of the Astrorhizidce in 
which really segmented, polythalamous tests are the rule. It will save repetition to 
notice these and other peculiarities in connection with the typical species, Aschemonella 
catencita. 
Aschemonella is essentially a deep-water type, and finds its most congenial home at 
depths of from 1500 to 2900 fathoms. 
Aschemonella catenata, Norman, sp. (PI. XXVII. figs. 1-11, PI. XXVII, A. figs. 1-3). 
Astrorhiza catenata, Norman, 1876, Proc. Roy. Soc., vol. xxv. p. 213. 
,, ,, Brady, 1879, Quart. Journ. Micr. Sci., vol. xix. N. S., p. 42, pi. iv. 
figs. 12, 13. 
Aschemonella scabra, Id. Ibid. p. 44, pi. iii. figs. 6, 7. 
Test free, irregularly branched ; chambers numerous, inflated, variable in size and 
contour, usually with several tubulated orifices, each of which may produce a fresh seg- 
