THE CARBONIFEROUS PERIOD. 
87 
seen, that while the latter 
preserves some of the Trilo- 
bitic characters, such as the 
marked articulations on the 
posterior part of the body 
and their division into three 
lobes, yet, in the prominence 
of its anterior shield, its 
more elongated form, and 
tapering extremity, it resembles its modern rep- 
resentative. 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 Carbonif- 
erous period, a group which is chiefly represented 
among living Crustacea by an exceedingly mi- 
nute 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 main- 
tains 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 
