So here are my four:
Dead Flesh Lizard: A small lizard with a nearly translucent skin. Some think that this is why they are called "dead flesh lizards", however; the truth is that they collect meat from dead creatures to make their nests, several lizards working together to create a large pit under the earth where their eggs are laid. The stench of this is can be extreme, and just as the smell fades, the eggs hatch and the rotten liquefied flesh is eaten by the young lizards. [Adventurers walking on the surface have a chance of falling into the nest, and take d4 damage from the bites of the lizards before they flee. Hoard class I, nests may be detected as traps, or avoided all together by parties with dogs]
Plains Basilisk: Thought by the most erudite scholars to be a sub-species of the common Basilisk, the Plains Basilisk is generally larger, leaner, and longer limbed. [move of 100'/30'] Their color ranges from the usual Basilisk Brown Green, to a nearly tan color. During the summertime, when they are most active, they can be seen stalking prey from patches of long grasses, or sunning themselves on rocks or termite mounds. In the winter, they generally hibernate for weeks at a time.
Unlike a common Basilisk, the plains Basilisk keeps no den, and therefore has no hoard worth speaking of. However, its the powder made from the large scales of its neck are considered to be an aphrodisiac in some quarters, and the most depraved will spend unimaginable sums for this powder. [this powder is inhaled, and causes partial petrification of extremities lasting d6+1 rounds]
Hill Wallow Shrimp: The Hill Wallow Shrimp is a parasitic shrimp carried by wild or domesticated hogs from wallow to wallow. They are occasionally collected by enterprising adventurers and sold in jars to bored elvish children as "ocean apes" complete with little wooden kingdoms, and halflings find them to be delicious. [If the adventurers consume the Hill Wallow Shrimp in any quantity, either by drinking the water, or by eating a cake of the shrimp themselves, they will have a small chance of contracting lycanthropy from the experience. In addition, wallows in the wild are protected by Giant Boars 1/6th of the time, who come charging out of some nearby brush if the PCs stop too long by the wallow]
Ebon Hair Willow: The Ebon Hair Willow is a particular type of tree linked to a particular type of Dryad. The tree from afar looks like a normal weeping willow of dark color, however; once it is examined at close range, it is noted that the branches and trunk are the color of bone, and the leaves are instead long black hair twisting and turning in a wind that no one can feel. Touching the hair brings out the dryad, who is chaotic and hideous to look at. She is as white as bone with long black hair, and seeks to destroy those who disturb her slumber. She uses her charm ability to make the party fight amongst themselves, and pulls the weakest into the tree, which reacts with a bone crunching shudder. The hair of the tree is used by necromancers to bind the bones of skeletons for rituals, and is highly sought after, both by those who want the hair, and those who wish to destroy the tree and with it, the dryad.
by Leiber, which was frankly rather poor. The amount of on camera sex, and "edgy" sex, was astounding, particularly in comparison to the other books. The last "adventure" is basically a series of voyeuristic vignettes, in which our heroes are completely passive. Certainly not recommended. Pretend that Faf and the Mouser just rode off into the sunset or something. 
