Helloha:
 
Have any of you Trivia fanatics have observed small spurs
(threads)running our of the concentric cords.  In the Hawaiian species,
they vary from very week to about a third the diameter of the concentric
cords.  In some specimens they form axial threads in continuous lines
near the base.
 
I photographed animals of 4 species last week, and first noticed the
sculpture detail when I photographed the shells with enough
magnification to fill a photo frame.  In the past I hadn't noticed them.
 
The question is:  Do other Trivia exhibit this micro sculpture?
 
Aloha, Have a good year.
 
Wes