Very nice group. Always glad to see someone interested in cancels, too.
Have a look at:http://www.briefmarken-universum.de...g/index.html
For Germany proper, click on "Stempel-sammlung" and then click on "Andere Gebiete" when you get there. Not complete, but a good reference and
I think names for these are often pretty generic: single circle (or ring), double circle (or ring), and suchlike. There must be a specific name for the bottom type in German, the style of which has been used by many others around the world. Elsewhere it's been called the bridge type for the shape, and sometimes the German type. In Dutch it's "langebalkstempel".
EDIT: The HERRLINGEN cancel is an older type first used when Wurttemburg was a separate state. It can be found in that section of the above website.
If you have other socked-on-the-nose examples, I encourage you to show them off on this thread:http://goscf.com/t/11866