Hi, Carole!

This may not be the paper you are looking for but is is quite helpful in showing the differences between various genera of the Naticidae, including the three genera you mentioned: Cenozoic Fossil Naticidae (Mollusca: Gastropoda) in Japan by Ryuichi Majima.  You can access it in the BHL at http://www.biodiversitylibrary.org/item/40603#page/7/mode/1up  .

I hope that this is useful.

All the best from Korea!
Ron Noseworthy


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On Sun, 9/17/17, Carole Marshall <[log in to unmask]> wrote:

 Subject: [CONCH-L] Naticarius, Neverita etc
 To: [log in to unmask]
 Received: Sunday, September 17, 2017, 3:48 AM
 
 Can anyone tell me what paper
 discussed the differences in the Naticarius, Neverita,
 Stigmaulax. And how I can obtain that information?
 Thanks,
  Carole Marshall
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