THE PRE-ADAMITE EARTH. 



existence is shown in the following table, exclusive as before of 

 the Annulata. 



Synopsis of the Animal Kingdom (exclusive of the Annulata) during the 

 Fourth Palceozoic Period. 



281. It appears that of former genera 99 were revived, while 

 71 new ones were created, making the total number of genera 

 then existing on the earth 170. Besides these, however, there 

 were at least 3 genera of Crustacea. This period was also 

 signalised by the first unequivocal appearance of insects and 

 Arachnida (scorpions) (fig. 143), the organic remains including 

 besides Arachnida three orders of insects the Coleoptera (beetles), 

 the Orthoptera (crickets, locusts, grasshoppers), and the Neuro- 

 ptera (dragon-flies). 



282. Exclusive of the remains of animals of the other divisions, 

 the number of species of Mollusca and lladiata alone ascertained 

 to exist in this period, is 1047, which have been catalogued and 

 described by M. D'Orbigny.* 



* Prodrome, p. 110162. 



. 43 



