A further sea slug page by Wolfgang
Seifarth: Nudibranchs from the Mediterranean and the Indian Ocean.
Numerous (!) pictures of snails' and other molluscs' shells can be
found at Worldwide Conchology (http://www.worldwideconchology.com),
especially of non-European snail groups.
Vibrant Sea: Underwater
pictures by Jeff Rosenfeld.
Seaotter.com: "Marine Life
of the Northwest Pacific Ocean" by Keith and Jon.
Kelpdiver.com: Underwater
pictures by Sami, from the American North-West coast: Washington State
as well as British Columbia.