83 
THE FERE FORESTS OF 
resents a characteristic Chambered Shell of the 
Carboniferous age. Goniatites is the scientific 
name of these later forms. If we had looked for 
them in the Devonian period, we should have 
found many with looser coils than these, and 
some only slightly curved in the shape of a horn. 
These, as well as the perfectly straight forms, 
still exist in the coal period, but the Goniatites 
with close whorls are the more numerous and 
more characteristic. 
The Articulates have gained their missing class 
since the close of the Devonian period, for In- 
sects have come in, and that division of the Ani- 
mal Kingdom is therefore complete, and repre- 
sented by three classes, as it is at present. Of 
the A orms little can be said ; their traces are 
found as before, but they are very imperfectly 
preserved. There are still Trilobitcs, but they 
are very few in number, and 
other groups of Crustacea 
have been added. 
One of the most prominent 
of these new types bears a 
striking resemblance to the 
Ilorse-Shoe Crab of present 
times. I here present one of 
our common Horse-Shoe Crabs 
above one of these old-world 
Crustaceans, and it will be 
