Ecod 



A habitat form; an organism showing Somatic adapta- 

 tions to a specific environment, not hereditable, cf. Pheno- 

 type, Ecotype. 



Ecesis 



See Establishment, Spread, Invasion. 



Echard 



A term occasionally used to denote the water in the soil 

 below the permanent Wilting percentage (q. v.); not avail- 

 able for absorption by plants. 



Echinoderm 



A marine animal in the phylum Echinodermata such as 

 starfish, sea-cucumbers, and sea-urchins. 



Echolocation 



The ability of certain animals, especially bats, to orient 

 themselves by emitting high-frequency sounds and detect- 

 ing their echoes; acoustic orientation. 



Ecize 



To undergo Ecesis (q. v.). 



119 



