Revised & Updated Edition
9th printing September 2019
& updated 9th printing has the same number of pages as the original
and subsequent printings, and looks pretty much the same. However,
the flatworm section has been completely redone and many scientific
names have been updated. Also, the photos have all been rescanned
due to a problem with the original plates.
it has proved too difficult to list and post all the text changes
as I have done for previous printings.
info / Purchase
a 20 page PDF document listing updates and corrections to the original
updates appeared in the 3rd printing [revised edition], February 2006)
a 15 page PDF document listing updates and corrections to the 2006 Revised
(these updates appeared in the 5th printing,
a 4 page document listing updates and corrections as of May 2012
(these updates appeared in the 6th printing,
an 8 page document listing updates and corrections as of April 5, 2014.
(these updates appeared in the 7th printing,
name changes that will appear in the 10th printing.