Following the usual rules, the length is the radial distance from the
umbo to the furtherst margin, the perpendicular maximum dimension is the
width and the maximum dimension perpendicular to the marginal plane is
the diameter.
--
Aloha from Wesley M. Thorsson
Editor of Internet Hawaiian Shell News, a monthly Internet Publication
122 Waialeale St, Honolulu, HI 96825-2020, U.S.A
http://www.hits.net/~hsn/index.html or
http://home.att.net/~w.thorsson/index.html