My. H. B. Brady on Keramosphera. 243 
same batch of material. The result of the examination of 
these two specimens I propose to give in few words; and it is 
only necessary to state at the outset that they have been found 
to illustrate a type of foraminiferal structure not previously 
described, though closely related to certain well-known por- 
cellanous forms. 
The two organisms to which allusion has been made are, 
or rather were, spherical tests of y and ~; inch (2°5 and 2°3 
millim.) diameter respectively, of milky-white colour and por- 
cellanous texture; the entire surface was areolated or “ blis- 
tered,” the areole somewhat irregular in outline, each appa- 
rently corresponding to a single chamberlet. The general 
appearance of the larger of the two, as seen under a magni- 
fying-power of 25 diameters, is excellently given in P]. XIII. 
fig. 1,6. A transparent section, as nearly central as pos- 
sible, was subsequently made of the same shell, portions of 
which, more highly magnified, are shown in figures 3 and 4, 
The smaller specimen, laid open by a particularly happy frac- 
ture, is accurately portrayed in figures 2, a and 6, 
The general arrangement of the test is easily understood by 
a comparison of these various drawings. ‘They show that it 
is composed of chamberlets arranged in more or less regular 
concentric layers, that the chamberlets are convex on their 
outer surface, and that they vary somewhat in size and shape, 
but not to such an extent as to interfere with a tolerably sym- 
metrical plan of growth. 
To determine the minute structure with any degree of com- 
pleteness, and especially the nature of the communication that 
subsists between the chamberlets, would require a number of 
sections made on different planes, which cannot be obtained 
without a larger supply of specimens; nevertheless, with the 
help of allied organisms, the anatomy of which is well known, 
the available material is sufficient for the elucidation of all the 
more important and characteristic features. 
A preliminary examination brings one fact into prominence, 
namely the close analogy that exists between the arrangement 
of the chamberlets in the sectional view and that found in the 
genus Orbitolites ; indeed there is scarcely any portion of the 
section to which a counterpart may not be found amongst the 
figures which accompany Dr. Carpenter’s memoir on the 
latter type*. It must, of course, be borne in mind that the 
section of a spherical test does not, like the horizontal view of 
an Orbitolite, present a series of chamberlets grouped on one 
level, the whole of which, together with their means of inter- 
communication, can be seen at one time, but is rather the view 
* Phil, Trans. 1856, 
