Not sure what you are looking for, but checked www.amazon.com and found
 
Compendium of seashells : a color guide to more than 4,200 of the
world's marine shells by R. Tucker Abbott
 
Although out of print you can still order.
 
Also check:
www.borders.com
www.barnesandnoble.com
 
I have just started ordering books online and found that often one can
buy cheaper online than at their store.
 
Hope this is of help.
 
Happy Shelling,
Julie Dillon