Florida Bulimulus again

A few days ago, the mysterious Bulimulus species from Jacksonville was found northeast of the city. The localities are 27.8 kms apart, as the crow flies. As I doubt if any crow (or whatever Floridan bird) may have carried the eggs of this species, it remains mysterious how this population got there. Was is transported by trucks visiting the Duval Container Co. station? Has it been there for more years, unnoticed to local snail hunters?
Questions abound, answers yet to come.

Bulimulus_Jacksonville
Bulimulus sp. aff. guadalupensis (Bruguière, 1789)
cf. West Indian Bulimulus
[same taxon as Duval Container Co. station]
USA: Florida: Nassau Co.
US 301, 0.1 mi N Seaboard Coast Line RR.
Just W roadside, grassy shoulder, Fifteensnails actively crawling on larger weeds.
30º30.622'N 081º52.596'W.
H.G. Lee and E.W. Cavin! 26 June, 2010.

Thanks to Harry Lee for collecting and to Bill Frank for reporting.