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Updated: June 10, 2025
The smaller Foraminifera now give way, and are found in lessening proportion to the larger; the coccoliths first lose their thin outer border and then disappear; and the clubs of the rhabdoliths get worn out of shape, and are last seen, under a high power, as infinitely minute cylinders scattered over the field.
But the grain is extremely fine, admitting of the highest polish. Of black marbles in the formation of which both the animal and vegetable kingdoms have taken part, their substance being composed of the finely-ground remains of foraminifera, corals, and shells, and their colour produced by the carbonaceous deposits of ancient forests few kinds seem to have been used by the ancient Romans.
The most ancient forms recently made known by Ehrenberg are exceedingly like those which now exist: no one has ever pretended that the difference between any ancient and any modern Foraminifera is of more than generic value; nor are the oldest Foraminifera either simpler, more embryonic, or less differentiated, than the existing forms.
It would appear that this infiltration of Foraminifera shells with Glauconite does not take place at great depths, but rather in what may be termed a sublittoral region, ranging from a hundred to three hundred fathoms.
In like manner the specific identity of the characters of the foraminifera, which are among the lowest types of the invertebrata, has outlasted that of the mollusca in an equally decided manner.
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