I use Turgeon et al. (Mollusks second edition, American Fisheries Society Second Edition, Special Publication 26, Common and Scientific Names of Aquatic Invertebrates. Donna Turgeon Chair edited by Quinn, Bogan, Coan, Hochberg, Lyons, Mikkelsen, Neves, et al. pub 1998. That is an old one and I know it is somewhat outdated, but that is the last PUBLISHED
version. Many others have their own views and very probably they are correct, but none has been PUBLISHED. I took mine and numbered the families. Zebinidae has historically been part of the Rissoinidae but is a fairly new family (not in Turgeon), Since it is still in the superfamily Rissoininae, and the listings are alphabetical within the group, deal accordingly. (p 70 Turgeon) Vermetidae is on p. 81. Aplysiidae is on p 122, after the paper bubbles. Ellobiidae is on p 132 after the nudibranchs.
So basically Bob's order corresponds to that of Turgeon.
Carole Marshall