Hello, I also think that Paul's is a good idea, so I will try to follow it.
About 'urceus', Mörch also named so an Achatinadae genus in 1847. Despite
it becames after a synonim for Achatina, I wonder if it could add some clue
to the sense of the name.
And I think there is an 'Olivancillaria urceus' too.
Best regards,
Alfonso Pina
Málaga, Spain
www.eumed.net/malakos