the first was called the etheric because
the human body under those conditions
was composed of a matter which was subtler,
more fluid and less dense than ordinary
organic substance as we know it. 

the second was the hypoborean. 
is said to have loose-knit, half-human,
watery bodies who inhabited
lands long since sunk into the seas.

well, that's all we have time for today kids. truly it's fuggin' hot as you know what, and i am doggone tired. 
talk among your selves, and discuss with your selves how you want to proceed. do you want to study the history of evolution, when it appears it might end soon with the final trump of capitalism? 
but wait, you say, there's four root races to go!