XXX11 



Fteropoda. 



Pisces. 



Amphibia : Rana. 



Reptilia : Chelone. 



Aves : by legs, by wings. 



Mammalia. 



6. Free in Air. 



Passive, Carried by currents. 



Adapted by minute size and lightness, with investment 

 resisting drying. 



Plants. 



Examples. Spores of Lycoperdon, &c. 



Animals. 



Examples. Rotifera : Infusoria, &c. (encysted). 



Adapted by expansion of surface, increasing resistance to 

 falling (parachute action). 



Plants. 



Examples. Many Seeds and Fruits. 



Animals. 



Examples. Arachnida : Lycosa. 

 Pisces : Flying-fish. 



Reptilia : Flying-Gecko, Flying-Dragon. 

 Mammalia: Flying-Fox, &c. &c. 



Active. Some portion of the expanded surface being actively 

 moved (=true flight). 



Animals. 



Examples. Insecta. 



Reptilia : Pterosauria. 



Aves : Archseopteryx ; birds generally. 



Mammalia : Cheiroptera. 



