46 



Mayflies abomuled and tho tiist miisiciaiis of the enrtli aijpcared in 

 the form of Ortliopteraiis whicli. liy means of tlieir slirillin.u- organs, 

 enlivened the solitudes of tlie strange old Devonian forests with their 

 love calls and wooing notes. Among fishes, the Ganoids and Selachians. 



INDIANA 



at IKe Close o\ 

 De voni an i imt, 



of wliich our gar-pikes, sturgeons and sliarlvs are degenerate descendants, 

 reached the acme of their development: wliile gigantic species of Dip- 

 noans or lung-fishes, now only represented by the dog-fish or "John 

 A. Grindle," abounded in the bays and bayous about the ancient Genesee 

 flats. 



