Kindly help ID unusual tower shell

[paul monfils]

Some juveniles have elongate ridges (called striae) on the early whorls. When the shell was only an inch or so in length, the striae ran the full length of the shell, but as it continued to increase in size the striae become less pronounced, and then disappear completely. I believe this is connected to geographic location. I have noticed such early striae on some shells from India but not on shells from Taiwan or the Philippines.