It's from Barlowe's classic Expedition book
He also did the great Barlowe's Guide to Extraterrestrials in the early 1980s.
Barlowe's alien creatures are aiming for some semblance of biological plausibility. In the book version, they relied more on sonar than sight as most Earth life does to get around, etc.
Here is his new official Web site:
http://www.waynebarlowe.com/index.htm
And here is a Web site showcasing most of this projects:
http://www.cuug.ab.ca/~lapierrs/creative/barlowe.html