Smith - Mlok

Weird, flat aliens from the planet with very strange conditions. 

"Each of the beings was about four feet high, with a somewhat doubtful division into head and body. Their formation was incredibly flat and two-dimensional; and they seemed to float rather than stand, as if swimming through the air. The upper division, which one accustomed to earthly physical structures would have taken for the head, was much larger than the lower, and more rotund. It resembled the featureless disk of a moonfish, and was fringed with numberless interbranching tendrils or feelers like a floral arabesque.

The lower division suggested a Chinese kite. It was marked with unknown goblin features, same of which may have been eyes, of a peculiarly elongated and oblique sort. It ended in three broad, streamer-like members, subdividing into webby tassels, that trailed on the ground but seemed wholly inadequate for the purpose of legs.

The coloration of these beings baffled Sarkis. He received alternate impressions of opal-shot blackness, elusive greyness and blood-bright violet."

Clark Ashton Smith, The Star-Change