70 HENRY B. BRADY, 
to they were unimportant and represented by few indi- 
viduals. 
A sufficient number of apparently clean specimens of 
Biloculina were selected for chemical analysis, but the 
result gave a proportion of silica which suggested that not- 
withstanding the careful washing to which they had been 
subjected, the chamber cavities had retained a certain amount 
of sand. The experiment, however, was sufficient to prove 
that the tests contained no earthy carbonates except car- 
bonate of lime, and no phosphates. 
The analysis of Haplophragmium subglobosum was more 
satisfactory, and as it is interesting to compare the chemical 
composition of the test of one of the non-labyrinthic Litwole 
with that of a labyrinthic type such as Cyclammina cancel- 
lata, of which the analysis was given in a previous paper 
(‘ Quart. Journ. Mic. Sci.,’ vol. xix, N.S., p. 25), I append 
the details. As often heretofore ] am indebted to my friend, 
Mr. J. T. Dunn, B.Sc., for practical help in the chemical 
portion of the subject. 
Haplophragmium subglobosum. 
Silica . : : 3 : my Koni K(, 
Peroxide of iron with some alumina 16:30 
Carbonate of lime . : : Re ERD 
99:70 
The alumina was not separately determined, but as 
it only exists in small proportion, the importance of pre- 
oxide of iron as a constituent is evident ; and that the per- 
centage is even larger than in Cyclammina is a noteworthy 
fact. No phosphoric acid was present nor was there any 
trace of magnesia. 
In a recent letter, referring chiefly to the Biloculina 
deposit, Professor G. O. Sars states that in the portion of 
the Arctic Ocean lying east of the cold area already alluded 
to, namely, east of Finmark, Bear Island, and Spitzbergen, 
an entirely different bottom-fauna prevails. In this eastern 
area the characteristic rhizopod is the large, stellate, arena- 
ceous type Rhabdammina, which exists in such abundance 
as to render the term “ Rhabdammina-ooze’’ not inappro- 
priate for the dredged mud. 
I can scarcely conclude these preliminary papers without 
expressing the obligation I am under to some of my old 
fellow-labourers in the same field of research. But for their 
