Mr. H. J. Carter on Ramulina parasitica. 95 
from a base about 1-1200th inch in diameter, apparently 
situated in the centre of a polygonal grain of calcite about 
2-6000ths inch in diameter (fig. 3, @and 6). Grains of calcite 
forming in apposition the structure of the chamber-wall, 
which is therefore very thin (fig. 4, a). Internally filled with 
areticulated structure (fig. 4, 6, and fig. 5, a), the larger inter- 
stices of which arein many instances occupied by a spherical cell 
(? reproductive body) (fig. 6, g &c.) varying under 4-6000ths 
inch in diameter. In the confined state parasitically extending 
into the cells of Orbitolites Mantelli, var. Theobald’, which it 
infests, when each lobe or chamber of the parasite occupies a 
single cell in the central plane of this Orbitolite and is succes- 
sively connected with its neighbours, chain-like, by a single 
stolon (fig. 1, c, and fig. 6, 2), while instead of following the 
circular linear arrangement of the cells of the Orbitolite, the 
chain-like development frequently leaves it obliquely in a 
zigzag form (fig. 1,e); or in the free state (fig. 1, £7) spread- 
ing out independently in the reticulated one above mentioned 
among the sand &c. of the stratum in which the Orbitolites 
have been deposited, now more or less held together by a 
matrix of crystalline calcite, which in the polished fragment 
admits of the Ramulina in its free state being seen at differ- 
ent depths below the surface. 
Loc. 'The bed of Orbitolites Mantelli, var. Theobaldt, in 
the west bank of the Irrawadi, 6 miles below Thayetmyo, in 
Burma (‘ Annals,’ 1888, vol. i. p. 342). 
Obs. This microscopic form so prevails in the bed of the 
Orbitolites just mentioned, that it is hardly possible to subject 
a small fragment of the latter, which has been polished for an 
opaque object or ground down to a thin translucent slice, to 
microscopic examination without observing several portions of 
it; while its chief habitat appears to have been in and about the 
cells of the test of this species of Orbitolite, which is the only 
species of large Foraminifera in the deposit. So like is the 
chamber with its straight tubuli to the cells and their inter- 
uniting tubuli, of which the crust of the Orbitolite is com- 
posed, except that the tubuli in the former are only on one 
side, that it is often difficult to distinguish the difference ; 
but that it is a distinct structure is confirmed by its growth 
in parts only of the central plane, as above mentioned, and 
its occurrence over part of the “crust” in the microscopic 
section of the “crust” and central plane together, where the 
contrast between the two is unmistakable. Of course all 
that is peculiar to it now in a lapidified state must have 
taken place before it thus became perpetuated by fossilization. 
Although parasitic it was evidently a species of Foramini- 
