Thanks to all who offered help off-list and LTS.
Dan Teven replied:
"Looks like Guraleus himerodes (Melvill & Standen, 1896).
Source: http://www.gastropods.com/9/Shell_19239.html"
It certainly looks like the one. So, just need to verify names, check synonyms, etc.
If it leads to anything more of interest, will be sure to share it here.
Thanks,
Bob Abela
Guam
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