XXXI 



SWIMMING. 

 By Cilia and Flagella. 



Plants. 



Examples. Spores of certain Algae. 

 Spores of certain Fungi. 



Animals. 



Examples. Infusoria. 



Radiolaria : some. 



Ctenophora. 



Turbellaria. 



By Expulsion of Water from a chamber whose walls are 

 suddenly approximated, or by appendages suddenly approximated. 



Animals. 



Examples. Hydrozoa : Medusae, Siphonophora. 

 Echinodermata : Antedon. 

 Insecta : Larva of Libellula. 

 Pelecypoda: Pecten. 

 Cephalopoda. 

 Urochorda : Salpa, Doliolum. 



By wave-like undulations or bendings of the whole or part of 

 the body, and not by paired appendages. 



Animals. 



Examples. Leech. 

 Sagitta. 



Gastropoda : Carinaria, Pterotrachea. 

 Urochorda : Appendicularia. 

 Pisces : some ? 

 Amphibia. 

 Reptilia : Hydrophis. 



By Paired Appendages alone, or combined with flexions of 

 body. 



Animals. 



Examples. Crustacea : Portunus, &c. 



Arachnida: Hydrachna, &c. 

 Insecta : Hydrous, Water-skaters. 



