> There is a prodigious work entitled "Treatise on invertebrate paleontology,"
> which has dealt with numerous phyla.  Among the mollusca, only the
> cephalopods and bivalves have been treated intensively, and, although this
> was considered a work-in-progress, I sense that the cast of contributors and
> editor haven't maintained the enterprise, which you can see was desultory at
> its best.
Harsh words - another part was released last year, and work is in progress
on several others to the best of my knowledge. The problem, as with all
these collective efforts, is getting people to get on with it. The
Gastropoda up to the Rissooidea are very well covered in volume 1.