Acoelous?

["Mickey Mortimer" <mickey_mortimer@email.msn.com>]

In the redescription of nodosaurs from the Albian-Cenomanian of England, the
term acoelous is used to describe vertebrae in a manner similar to that of
amphicoelous, opisthocoelous, etc.  What does acoelous mean?
Just to clear things up, from front to back, I know the following terms
mean:
opisthocoelous- convex-concave
procoelous- concave-convex
What are amphicoelous, amphiplatyan and platycoelous
Thanks in advance.

Mickey Mortimer