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Updated: June 23, 2025
"I abstain, however, at present from drawing any positive conclusions, preferring rather to await the result of more extended observations." Dr. Wallich, Professor Wyville Thomson, and Dr. Carpenter concluded that the Globigerinoe live at the bottom. Dr.
This soft substance is, in fact, the remains of the creature to which the Globigerinoe shell, or rather skeleton, owes its existence and which is an animal of the simplest imaginable description.
Again, the relative proportions of young and fully formed Globigerinoe seem inconsistent with the notion that they have travelled far. And it seems difficult to imagine why, had the deposit been accumulated in this way, Coscinodisci should so almost entirely represent the Diatomaceoe. Mr.
In fresh examples from the surface, the dots indicating the origin of the lost spines may almost always be made out with a high power. There are never spines on the Globigerinoe from the bottom, even in the shallowest water." There can now be no doubt, therefore, that Globigerinoe live at the top of the sea; but the question may still be raised whether they do not also live at the bottom.
Moreover, having obtained certain living star- fish from a depth of 1,260 fathoms, and found their stomachs full of "fresh-looking Globigerinoe" and their débris he adduces this fact in support of his belief that the Globigerinoe live at the bottom. On the other hand, Müller, Haeckel, Major Owen, Mr.
It may be worth while briefly to consider a few of these collateral proofs that the chalk was deposited at the bottom of the sea. The great mass of the chalk is composed, as we have seen, of the skeletons of Globigerinoe, and other simple organisms, imbedded in granular matter.
Ehrenberg appears to have taken it for granted that the Globigerinoe and other Foraminifera which are found in the deep-sea mud, live at the great depths in which their remains are found; and he supports this opinion by producing evidence that the soft parts of these organisms are preserved, and may be demonstrated by removing the calcareous matter with dilute acids.
In 1853, Count Pourtalès, an officer of the United States Coast Survey, which has done so much for scientific hydrography, observed, that the mud forming the sea-bottom at depths of one hundred and fifty fathoms, in 31° 32' N., 79° 35' W., off the Coast of Florida, was "a mixture, in about equal proportions, of Globigerinoe and black sand, probably greensand, as it makes a green mark when crushed on paper."
We never have been able to detect, in any of the large number of Globigerinoe which we have examined, the least trace of pseudopodia, or any extension, in any form, of the sarcode beyond the shell. "In specimens taken with the tow-net the spines are very usually absent; but that is probably on account of their extreme tenuity; they are broken off by the slightest touch.
So long as the Globigerinoe;, actually collected at the surface, have not been demonstrated to contain the elements of clay, the Challenger hypothesis, as I may term it, must be accepted with reserve and provisionally, but, at present, I cannot but think that it is more probable than any other suggestion which has been made.
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