inhabited planets

[anagogy]

As Ra said, the 35% do *not* fit into the percentiles given for densities in the Milky Way Galaxy, thus, they were not included in the percentiles.

I couldn't follow how that mysterious 35% do not fit into the percentiles.

My guess was/is, that 35% represents the "creatures" such as spirit/mind complexes (mentioned in session 17.38) and/or angelic entities which Ra might have implied in 17.37.

I think its just that portion that is dwelling spiritually as a portion of the Logos.  These are probably different kinds of astrological influences -- the holographic Logos reflecting itself in the very stars and certain planets in significant archetypical patterns and such.  
So we subtract that 35% from the total amount of intelligent planets, because it doesn't dwell at any particular density level, and cannot be classified as such, and Ra took their percentages from the remaining set of intelligent planets which could be reliably pigeon holed into their appropriate density labels.