OK, finished up the last few. given that the writeups are spread out over the 1st page, i'm just reposting them all here. let's firm up the CRs where they are questionable, and make final decisions on creature types where needed. also, if you can think of any way to rephrase the description, or any aspect of the creature from the original text that i didn't use which would make it sound more appealing, this is your chance to speak up.
Cave Fisher
Magical Beast, CR 2
These large, cave-dwelling insectoid creatures resemble both spiders and lobsters. A cave fisher can fire a strong, sticky filament that attaches to a creature due to its powerful adhesive. The cave fisher reels in the filament to get better attacks on its prey.
Originally found in Monster Manual II (1982)
Rot Grub
Vermin (Swarm), CR X
These little worm-like creatures hide in garbage, dung, or corpses, and attack any living creatures that wander too close. They burrow into a victim’s skin, dealing damage every round until the victim is dead.
Originally found in Monster Manual (1977)
Scarecrow
Construct, CR 4
This creature is built to look like a humanoid with a gourd for a head. Its attack allows it to fascinate foes, making them unable to act. A scarecrow is immune to cold, but vulnerable to fire.
Originally found in Fiend Folio (1981)
Tabaxi
Humanoid, CR 1
These CN feline humanoids have spotted reddish coats. They are able to attack with their sharp claws and teeth, and sometimes use primitive weapons. Tabaxi are excellent hunters, and use their markings to hide and ambush prey.
Originally found in Fiend Folio (1981)
Piercer
Aberration/Vermin, CR 1/4
These creatures resemble stalactites and hang from cavern ceilings. They drop down to impale opponents, dealing significant damage on a critical hit.
Originally found in Monster Manual (1977)
Hammer Golem
Construct, CR 10
These golems were built by dwarven priests to serve both as guards and miners. A hammer golem looks like an oversized dwarf made out of stone, and in place of one hand is a pick, and in place of the other is a hammer. It has an attack that works like the repulsion spell which also deals force damage.
Originally found in Dragon #193, "Live Statues and Stone Men: Golems of the Underdark" (1993)
Crystal Ooze
Ooze, CR 4
This ooze is an aquatic variety of gray ooze. Its form is translucent and clear, making it nearly invisible in water. Like most oozes, it constricts foes and deals acid damage. It is immune to acid, cold, and fire.
Originally found in S4 Lost Caverns of Tsjocanth (1982)
Firedrake
Dragon, CR 3
This small creature resembles a young red dragon. It has a breath weapon, but otherwise lacks the special abilities common to dragons. Its blood is highly flammable, and any cuts the creature sustains cause the blood to ignite and burn the attacker.
Originally found in Fiend Folio (1981)
Wolfwere
Magical Beast (shapechanger), CR 4
This shapechanger can assume the form of a wolf (its true form), a humanoid, or a hybrid of the two. Wolfweres can slow other creatures that hear their song of lethargy, and eat any victims they can kill. Wolfweres are not lycanthropes, and do not pass on their abilities.
Originally found in S4 Lost Caverns of Tsjocanth (1982)
Mustard Jelly
Ooze, CR 7
This pile of goo is a translucent yellow-brown color and looks much like any other ooze. However, this ooze is intelligent, believed to be the result of a wizard’s magical mishap. It attacks with acid pseudopods like most oozes, and its vapors slow creatures who get too close. When it needs to move faster, the mustard jelly can split into two equal halves.
Originally found in Monster Manual II (1982)
Voadkyn (Wood Giant)
Giant, CR 5
These relatively small giants resemble oversized wood elves, with whom they get along well. They are masters at woodland camouflage, and can change form to resemble any humanoid creature.
Originally found in Dragon #119, "Dragon's Bestiary: A Walk Through the Woods" (1987)
Magic Golem
Construct, CR 6
The magic golem is made of iridescent yellow energy in the shape of a humanoid, and is the amalgam of a human merged with wild magic. The Zhentarim discovered this method of turning a living being into pure magical energy. A magic golem can absorb magic and release it in a flare of wild magic.
Originally found in Ruins of Zhentil Keep (1995)
Pegataur
Monstrous Humanoid, CR 4
These relatives of the centaur have a more elvish appearance, and large wings like a pegasus. They live in caves in the sides of mountains, and are more aloof than either centaurs or pegasi.
Originally found in M2 Vengeance of Alphaks (1986)
Giant Troll
Giant, CR 6
These creatures are the hideous result of trolls crossbreeding with hill giants. They look mostly like oversized pot-bellied trolls, with reddish-brown skin and red-rimmed eyes. They usually carry spiked clubs made from tree trunks. They have fast healing (rather than regeneration), and the rock throwing and catching abilities of giants. Giant trolls also have the ability to pick up opponents and use them as battering rams to bludgeon other opponents.
Originally found in Fiend Folio (1981)
Urd
Humanoid, CR 1
These creatures are distantly related to kobolds, though they have a pair of leathery bat-like wings that allow them to fly for long distances. These night hunters travel in great flocks, and use weapons called rock bombs which break into many pieces and spray shrapnel all about.
Originally found in Monstrous Compendium MC2 (1989)
Duleep (Living Web)
Ooze, CR 1
These creatures appear as ambulatory spider webs. They can fire an electricity ray, or shock with their touch. When damaged, they split into smaller creatures.
Originally found in Dragon Magazine 89 (1984)
Al-mi-raj
Magical Beast, CR 1
This creature resembles a large rabbit, with a long black horn like that of a unicorn. These unpredictable creatures can blink, and randomly pop from one place to another using dimension door. They are aggressive when threatened rather than timid, though a caster than can tame one will have a useful familiar.
Originally found in Fiend Folio (1981)
Baku
Outsider, CR 12
The baku is a powerful defender of Goodness. They have elephantine heads, trunks, and tusks; the forelimbs of a rhino and the rear legs of a lion; and their bodies and tail are short and reptilian, with scaled horny plates like a dragon. Baku have access to numerous psionic powers (including invisibility, astral projection, and etherealness), and their trumpeting roar deals damage to evil creatures and causes fear.
Originally found in Dragon #65 "Featured Creatures" (1982)
Guardian Familiar
Outsider, CR 5?
This small, black cat-like creature has the proverbial "nine-lives", coming back stronger every time it gets killed. A guardian familiar is usually summoned by a wizard looking for something to guard his valuable items.
Originally found in Fiend Folio (1981)
Death Watch Beetle
Magical Beast/Vermin, CR 6
This giant, dark green beetle covers itself in leaves, twigs, and other rubbish to take its victims by surprise. By vibrating its carapace rapidly, the beetle causes a vibration that deals sonic damage to all creatures within 30-feet.
Originally found in Monster Manual II (1982)