a monster of vaguely anthropoid outline, but with an octopus-like head whose face was a mass of feelers, a scaly, rubbery-looking body, prodigious claws on hind and fore feet, and long, narrow wings behind.

CTHULHU

High Priest of the Great Old Ones It seemed to be a sort of monster, or symbol representing a monster,...

large, pinkish, fungoid, crustacean-like entities the size of a man; where a head would be, they have a "convoluted ellipsoid" composed of pyramided, fleshy rings and covered in antennae

MI-GO

Fungi from Yuggoth The Outer Beings are perhaps the most marvelous organic things in or beyond all space and time-members...

An alien plant; a central dilating mouth (big enough for a person to be pulled into) lined with thorns, surrounded by a ring of fat, tongue-like petals. A short woody bole covered in bark supports this horrible flower, with thick roots below. Between 7 and 12 vines emerge below the flower, each 20' long and 4-5" thick, ending in a cluster of "fingers" like a budded branch.

Corrupting Vines

Devil’s Snare, Tree-Devils, Ya’ax kisino, Ya-te-veo “Mr. Dunstan, naturalist, who has recently returned from Central America, where he spent nearly...