In some of them, however, there is no such sharp point
as is here figured, and the body terminates bluntly. There were a large
number of these Entomostraca in the Carboniferous period, a group which
is chiefly represented among living Crustacea by an exceedingly minute
kind of Shrimp; but in those days they were of the size of our Crabs and
Lobsters, or even larger, and the Horse-Shoe Crab still maintains their
claim to a place among the larger and more conspicuous members of the
class.
The Insects were few, and, as I have said above, of a kind which seeks a
moist atmosphere, or whose larvae live altogether in water. They are not
usually well preserved, as will be seen from the broken character of
the one here represented, although the wood-cut is made from a better
specimen than is often found. We have, however, remains enough
to establish unquestionably the fact of their existence in the
Carboniferous period, and to show us that the type of Articulates was
already represented by all its classes.
[Illustration]
Not so with the Vertebrates. Fishes abound, but their class still
consists, as before, of the Ganoids, those fishes of the earlier
periods built on the Gar-Pike and Sturgeon pattern, and the Selachians,
represented now by Sharks and Skates. In the Carboniferous period we
begin to find perfectly preserved specimens of the Ganoids, and the
adjoining wood-cut represents such a one.
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