The Monster List in the Master Set rules was divided into two parts: the Prime Plane (Actaeon to Sporacle) and Other Planes (Archon to Spider).
Prime Plane:
Illustration by Terry Dykstra, from the D&D Rules Cyclopedia (1991)
Actaeon - based on the story of Actaeon from Greek mythology
Adaptor - a race of plane-traveling shape-shifters
Athach - malformed, three-armed giants (name is from Scottish Gaelic folklore)
Beholder, Undead
Devilfish - based on the Ixitxachitl (from Blackmoor)
Dinosaur:
Dinosaur, Aquatic (Small, Large, Armored)Dinosaur, Land Carnivore (Small, Large, Flying)Dinosaur, Land Herbivore (Small, Medium, Large)
Dragon:
Dragon, (Crystal, Onyx, Jade, Sapphire, Ruby, Brown) - gemstone dragons*
*an article describing gemstone dragons appeared in The Dragon #37 (May, 1980)
Dragon, Pearl (The Moon Dragon), Ruler of all Chaotic Dragons
Dragon, Opal (The Sun Dragon), Ruler of all Neutral Dragons
Dragon, Diamond (The Star Dragon), Ruler of all Lawful Dragons
The Great Dragon, Ruler of All Dragonkind****see "The Mightiest of Dragons" in Dragon #158 (June, 1990)
Drake (Mandrake, Wooddrake, Colddrake, Elemental) - dragon-like shape-shifters
Faerie - invisible, aerial demi-humans
Giant (Mountain, Sea)
Hag (Black, Sea)
Hsiao - a race of strigiform, cleric-philosophers (name is from xiao)
Human (Headsman/Thug, Mystic) - based on the Assassin, Monk from Blackmoor
Lich - from Greyhawk
Lycanthrope (Werebat, Werefox,* Wereseal,** Other)
*from B4 "The Lost City"**based on the Selkie (from the AD&D 1e Monster Manual II)
Mek - huge, metallic, insect-like creations
Metamorph - a race of humanoid shape-shifters
Illustration by Jeff Easley, from the Master DMs book (1985)
Nekrozon - based on the Catoblepas (from The Strategic Review #7)
Nightshade (Nightcrawler, Nightwalker, Nightwing)
Nuckalavee - based on the Nuckelavee of Orcadian folklore
Ooze, Lava - a magma ooze
Revener - see this Facebook post:
I was developing a variety of beings for the Spheres (Matter Energy Time Thought), and the 5(6) senses are often ignored or irrelevant in most games. That said, I'm sure some culture produced something similar. (It often goes unused by DMs because it's not easy to run, and isn't cool-deadly-combat stuff; more for roleplaying.
Frank Mentzer (January 27, 2020)
Illustration by Jeff Easley, from the Master DMs book (1985)
Sasquatch - based on the Bigfoot of North American legend
Slug, Giant - from Greyhawk
Sphinx - from the AD&D 1e Monster Manual
Sporacle - a Beholder-like creature
