140 
THE VOYAGE OF H.M.S. CHALLENGER. 
examination of a sample, kindly furnished by Prof. Sars, are not without interest as bearing 
upon the relative proportion of its foraminiferal constituents. 
The locality from which the material was obtained is given as follows : — “ Lat. 
65° 47'‘5 N., long. 3° 7' W.; depth, 1862 fathoms; temperature at the bottom, 1 0, 2 C.” 
[about 34° Fahr.]. 
As the fine impalpable silt had been already partly removed, the cleaning was 
completed by washing on a sieve in the usual way. The loss was about 6 per cent, 
of the entire weight, and of the impalpable matter thus separated about one half was cal- 
careous, the remainder fine siliceous sand. I have no information as to the proportion of 
impalpable mud before the preliminary washing, but as it is said to be sufficient to 
incorporate the whole into a sticky paste which on being dried forms a hard, light- 
coloured, calcareous mass, it must be considerable. The composition of the material in 
the condition in which it was received was as follows — the proportions stated being by 
weight : — 
Biloeulina ringens (one half being entire shells), . 
Haplophragmium latidorsatum, 1 ..... 
Olobigerina borealis, ...... 
Sand and small fragments of rock with a few Foraminifera other than 
the above-named, ...... 
Impalpable debris, ...... 
50 per. cent. 
20 
55 
4 
20 
6 
55 
55 
100 
The specimens of Biloeulina are nearly all of the stout, inflated, typical form, with a 
small admixture of the depressed carinate variety, Biloeulina depressa, d’Orb. Beyond 
the species above named, the sample contained no microzoa worthy of note. 
Biloeulina irregularis, d’Orbigny (PI. I. figs. 17, 18). 
Biloeulina irregularis, d’Orhigny, 1839, Foram. Amer. M&rid., p. 67, pi. viii. figs. 22-24. 
(?) Biloeulina globulus, Renss, 1863, Sitzungsb. d. k. Akad. Wiss. Wien, vol. xlviii. p. 40, pL i. 
fig. 4, a-e. 
Biloeulina ventrieosa, Id., 1867, Ibid., vol. lv. p. 69, pi. i. fig. 9, a-c. 
Dr. Steinmann has shown that the Biloeulina contraria of d’Orbigny is not truly 
Biloculine in the adult condition, but that it exhibits a type of structure which may 
properly be regarded as generically distinct. There are nevertheless veritable Biloeulina 
which take the so-called “ contrary ” mode of growth, best understood by supposing a 
specimen of Biloeulina spheera compressed to a greater or less degree at the two sides 
instead of in the normal way from front to back. Such are the Biloeulina irregularis of 
d’Orbigny and the Biloeulina ventrieosa of Reuss. 
The amount of compression varies a good deal in different specimens. Those which 
are relatively thickest and least flattened make some approach to the contour of Biloeu- 
1 This is the Lituola subglobosa of M. Sars. 
