Al 4 MR. F. CHAPMAN ON THE 
occurrence at 240 fathoms is recorded. The massive Polytrema 
planum is found at almost all depths from shallow water to 200 
fathoms, but it appears to attain its highest development at a 
depth of 80 fathoms. It is well distributed round the atoll. 
The Bottom-living or Benthos species of Horaminifera. 
The species likely to be useful in affording data as to depth 
and other conditions of existence, in conjunction with the 
information derived from an examination of the consolidated or 
sandy material from the deep boring in the atoll, seem to be the 
following :— 
Orbitolites marginalis—This species occurs in its highest de- 
velopment and most frequently in the beach-sands, where at one 
place it is excessively common. It is also abundant at depths 
of 32 and 36 fathoms. At other depths it is found in less 
profusion, and is rare at 200 fathoms. 
O. duplex.—Although this is a common species in certain 
parts of the core from the main boring, it is by no means 
so in the dredgings, for it never occurs in larger numbers 
than three or four in any of the samples. It is found as far 
down as 200 fathoms, but is very rare at that depth. 
O. complanata.—This is recorded from three samples of beach- 
sands, avd oecurs at two of them in abundance. It is some- 
what rare at the various levels down to 200 fathoms, excepting 
in one spot at a depth of 60 fathoms, where it is common. 
Alveolina Boscii.—This is another species which occurs in the 
deep-boring at certain places with some frequency, but which is 
only found in two places on the reef-slope, at 36 fathoms and 
50-60 fathoms. A solitary specimen was noticed adhering to a 
reef-fragment from the shore. With regard both to this species 
and Orbitolites duplex, either the conditions at the present time 
and those of the past when the atoll was being built up differ, 
or, as is very probable, the species noted are extremely local 
in their distribution, and thus have been overlooked by the 
collector. 
Calcarina hispida is very common in certain of the beach- 
sands, and is also fairly abundant at depths of 35, 36, and 60 
fathoms on the reef-slope. 
Amphistegina Lessoni and Heterostegina depressa occur at all 
depths at Funafuti down to 200 fathoms. Both species are at 
their best, in point of size, at about 36 fathoms. 
Cycloclypeus Carpenteri.—This species is recorded as occurring 
