The Lost Solar System II

See The Lost Solar System.

In William Dexter's World In Eclipse:

old, dying, inhabited Vulcan;
dying silicon men on Uranus;
sentient minerals on Saturn;
thinking thread-like filaments on Jupiter;
aquatic life on Venus;
incandescent beings on Mercury;
intelligent insects on Mars;
albino humanoids on Neptune;
savage beast-men on Varang-Varang, closest to Earth;
no life on Pluto! (too cold?);
no life on three planets with chlorine and ammonia atmospheres.

Poul Anderson has:

aquatic life on Venus in "Sister Planet";
incandescent beings on Mercury in "Life Cycle";
three intelligent Jovian species in Three Worlds To Conquer;
colonists of Jupiter in "Call Me Joe" and the Technic History.