I had this one in grade school, and while the images stayed with me, the title slipped my mind for a couple of decades. Thankfully I had some sort of brain fart and I was able to track down the book again. I was excited, but also curious to see how much of artist Wayne Barlow's exobiology held up under the strain of time.
Having reread the book's descriptions, and poured lovingly over its illustrations, I'm happy to report that this is a masterful rendering of alien life forms depicted in various stories and novels by SFF's masters as well as some lesser-known lights. One needn't be intoxicated with the ethers of nostalgia in order to appreciate its greatness.
The creatures in the book range from the sentient to those that are mere collections of nerve fibers or amorphous clouds of interstellar dust. Some are grotesque, others are as colorful and exotic as any rara avis. Some really straddle that uncanny line between the beautiful and the terrifying. In some respects, these "borderline" aliens remind me quite often of the best nightmarish visions conjured up by the late, great artist H.R. Giger. Clive Barker might also be an apt comparison, though I hesitate to make it, as he's much more associated with pure horror. Maybe we'll settle on Lovecraft.
Too often SF artists work from very basic drafts, or even worse, thumbnail descriptions of what each tale entails. Wayne Douglas Barlowe not only takes his craft seriously, but he has read, ingested, and truly contemplated how each of the creatures depicted in the book might look, if form were to follow function, and hard science and pure imagination were to work hand in hand. A folio is included in the back of the book (which I don't remember from my original copy). It features drafts of some of the aliens exhibited here, as well as extracts from Barlowe's own SF fiction creation, Thype. He had intentions of writing a book or perhaps a series of books in the Thype universe, but alas, the project appears to be unrealized, at least in literary form. Highest recommendation, in any event.