Help me identify this shell from Sanibel Island

[dave r]

Euglandina rosea is sometimes called the 'wolf snail'. It has been introduced to other countries with disastrous results as it predates on the local endemic snails. It was introduced to Hawaii where it has wiped out a large proportion of the very local endemic Achatinellid snails as has done similarly on other Pacific Islands. Sad to say some of the introductions were done deliberately with the intention to eradicate other 'pest species' such as Achatina.
Dave