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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, 1 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. complanata ; in 

 which, besides the range of chambers, many exceedingly minute inter- 

 rupted perpendicular lines were seen between these and the outer plates, 

 showing that numerous plates existed here, as well as in the other spe- 

 cies; 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 

 power. Plate X. Fig. 23, is another section, similar to the last, but 



