I know little of slugs, but I took at look at Eugene Kozloff's Plants and Animals of the PNW (UW Press 1976), and it sounds like the snails might be Allogona townsendiana. He writes that the shell diameter is up to an inch, the living animal is light brown, and the shell has a polished brown covering that is eroded, revealing a whitish limey substance. Generally common in humid forests near the coast, but may be inland in moist environments. Most active in late spring. The book has color plates of six species.

Check these links for pictures of Allogona:
http://elib.cs.berkeley.edu/cgi/img_query?special=browse&where-lifeform=Invertebrate&where-taxon=Allogona+townsendiana

http://www.ent3.orst.edu/kgphoto/KGCode_Detail.cfm?ID=2268

Monadenia fidelis is larger, up to 3.5 cm, and is chestnut brown with bands; the body is reddish and smells like garlic, according to Kozloff.

http://www.femorale.com.br/shellphotos/detail.asp?photo=13231.jpg

Kevin Li
Ballard, USA
kdli at msn.com
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