B. Carpenter.
After a careful microscopic examination, these two distinguished
observers came to the conclusion that _Eozooen_ was truly organic,
and in this opinion they were afterwards corroborated by other
high authorities (Mr W. K. Parker, Professor Rupert Jones, Mr H.
B. Brady, Professor Guembel, &c.) Stated briefly, the structure
of _Eozooen_, as exhibited by the microscope, is as follows:--
[Illustration: Fig. 23.--Diagram of a portion of _Eozooen_ cut
vertically. A, B, C, Three tiers of chambers communicating with
one another by slightly constricted apertures: _a a_, The true
shell-wall, perforated by numerous delicate tubes; _b b_. The
main calcareous skeleton ("intermediate skeleton"); c, Passage
of communication ("stolon-passage") from one tier of chambers
to another; d, Ramifying tubes in the calcareous skeleton.
(After Carpenter.)]
The concentrically-laminated mass of _Eozooen_ is composed of
numerous calcareous layers, representing the original skeleton
of the organism (fig. 23, b). These calcareous layers serve to
separate and define a series of chambers arranged in successive
tiers, one above the other (fig. 23, A, B, C); and they are
perforated not only by passages (fig. 23, c), which serve to
place successive tiers of chambers in communication, but also by
a system of delicate branching canals (fig.
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