My specimens appear identical to pictures of Engina histrio that I found 
in books and on the web.  I found that WORMS lists histrio as a synonym 
of alveolata.  All the pictures of alveolata I found have a distinctive 
row of yellow nodules between the rows of black nodules, while the 
hisrio pictures and my specimens have only white nodules between the 
black rows.  Is there any disagreement with histrio and alveolata being 
considered synonyms?

A picture of the shells is posted on Lets Talk Seashells:
http://z14.invisionfree.com/Conchologist_Forum/index.php?showtopic=2986

-- 
Cecil N. Bankston
Baton Rouge, LA

----------------------------------------------------------------------
[log in to unmask] - a forum for informal discussions on molluscs
To leave this list, click on the following web link:
http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1
Type your email address and name in the appropriate box and
click leave the list.
----------------------------------------------------------------------