412 ANTIQUITY OF ARTICULATED ANIMALS. 
PI. 1, Fig. 49), a large Ranatra, and several 
Coleoptera. 
Numerous fossil Insects have recently been dis- 
covered ill the Tertiary Gypsum of Fresh-water | 
formation at Aix, in Provence. M. Marcel de 
Seri es speaks of sixty -two Genera, chiefly of the 
Orders Diptera, Heraiptera, and Coleoptera ; 
and Mr. Curtis refers all the specimens he has 
seen from Aix to European forms, and most of 
them to existing Genera.* Insects occur also 
in the tertiary Brown coal of Orsberg on the 
Rhine. 
General Conclusions. 
We have seen from the examples cited in the last 
four sections, that all of the four existing great 
Classes of the grand Division of Articulated 
animals, viz. Annelidans, Crustaceans, Arach- 
nidans, and Insects, and many of their Orders, 
had entered on their respective functions in the 
natural world, at the early Epoch of the Transi- 
tion Formations. We find evidences of change 
in the Families of these Orders, at several periods 
of the Secondary and Tertiary series, very distant 
from one another; and we further find each 
Family variously represented during different 
intervals by Genera, some of which are known 
* See Eclinburgli New Phil. Jourti. Oct. 1829. 
