Posted: Aug 11 2009

 Busycotypus spiratus pyruloides (Say, 1822), Say's Pear Whelk

Although many lump the following in one species or another, I've followed Abbott (American Seashells 1974) and presented them as named forms. 

Busycotypus spiratus spiratus (Lamarck, 1816)
Busycotypus spiratus pyruloides (Say, 1822)
Busycotypus spiratus plagosus (Conrad, 1862)

For more photos see jaxshells.com.