I think anyone interested in molluscan terminology (mollusc/mollusk) should try
and obtain an excellent Supplement produced in the Veliger in March 1965 by
Winifred H. Arnold. "A Glossary of a thousand and one terms used in conchology"
is a must for all of us with an interest in conchology/malacology and is widely
used throughout the world.
As an add the term used in this publication is mollusca not molluska.

Kev