Yamamura Mayuko
The drawings of Mayuko showcase the human anatomy in a very surreal and abstracted manner. Organs and bones are spread apart into a decorative fashion around their bodies. Scroll to the bottom of this page and click on the upper link to continue through this gallery.

Link found thanks to Cipango.

Gore Shriek
This gallery hosts pdf files of issues from "Gore Shriek", a trashy monster horror comic from the 80's. Scattered through some of the issues are creatures like this. Check it out.

Sean McCarthy
McCarthy's drawings mesh animal and human characteristics into hybrid abstractions and abominations. He also manages to manipulate seemingly random shapes into very peculiar looking lifeforms. You'll find more drawings by Sean McCarthy at this gallery.

Aaron Nathor
Here's a collection of weird creature drawings along with a few paintings. Lots of tentacled beasts and numerously eyeballed characters roaming this gallery.

Link found thanks to the amazing artist, Heiko Muller at Art Dorks.

Stan Manoukian and Vince Roucher
This gallery hosts the work of a duo of French comic artists. Although much of their site displays a wide range of comic art for various titles, the art most prominently on display is the very bizarre monster anatomies they've made, which can be seen scattered all over their website. You'll find more examples of their strange monster paintings at their myspace page.

Check out this part of the website to see some of the unusual monster art they've made.

Sea Monsters
This first link is an interesting array of small images of various sea abominations.

There are a few illustrations by Warwick Goble of sea monster attacking in this link. I really like these two images and the text accompanying them is great.

"A sudden appearance out of the sea of a race of amphibious monsters, capable of wiping man out of existence."

"Loathsome animals of huge size will creep over the masses of ice."

Here is a quote from the article related to the above illustrations taken from here.

"Fossil remains of crabs, 6ft. in length, have been discovered, and such enormous creatures might -- owing to some cause or other -- multiply exceedingly.

If we imagine a shark that could raid out upon the land, or a tiger that could take refuge in the sea, we should have a fair suggestion of what a terrible monster a large predatory crab might prove. And, so far as zoological science goes, we must, at least, admit that such a creation is an evolutionary possibility.

Then there are the cuttlefish, the octopus, and other denizens of the deep, any of which might conceivably grow in numbers, and extinguish man. "

Click the image on this link to see a larger version of this depiction of a whale and other sea monsters.

There is an interesting depiction of a sea serpent here.

This old map of Iceland has some interesting illustrations of fabled monsters around the island.

This link has no artwork but there are some good descriptions of legendary sea monsters.

Last but not least, here's pictures of real sea monsters.