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nummulites are very numerous ; and, from the flint bearing a high 
polish, they are very beautifully displayed in different sections. But 
the most interesting specimen is, a rounded nodule, apparently a bowl- 
der, full four inches in diameter, and composed of a dark greyish lime- 
stone, thickly beset with different species of this shell, other marine 
bodies, and small silicious pebbles. The examination of the outside 
of this nodule soon showed me, that it contained species of this fossil, 
which I had neither seen nor had read of. This rendering me, of 
course, anxious to give it as complete an investigation as I was 
able, I had it slit through the middle, and thus obtained two polished 
surfaces also for examination. 
On now examining the polished surfaces with a lens, I was struck 
with its composition. A mass of grey limestone contained some few 
detached angular quartz pebbles, visible to the naked eye, and innu- 
merable quartzose particles, which the polishing had manifested, by 
giving them a considerable degree of resplendency. Among these 
were disposed the animal remains, which were exceedingly nume- 
rous, and consisted chiefly of the common species of nummulites, dis- 
played in a great variety of sections. Other sections were also seen, 
which exhibited such differences of structure, as at once determined 
the animals to have been of different species from any which have 
been before noticed. Several sections were here shown of N. com- 
planata ; in which, besides the range of chambers, many exceedingly 
minute interrupted perpendicular lines were seen between these and 
the outer plates, showing that numerous plates existed here, as well 
as in the other species ; but that they were in this species of an 
extraordinary degree of fineness, as shown Plate X. Fig. 21. 
Plate X. Fig. 20, is a section of a body, in which a line passes along 
the centre, being a range perhaps of minute chambers, the spaces on 
each side of which and the external plates being filled up with inter- 
rupted lines, so fine as not to be seen but with a lens of considerable 
