Dear Porcine avionic supporters;- The responce to my questions has been terrific. I now know more than I did about Olives, Rivers, and Endangerment. What I really wanted to know about Dr. Zeigler was more about the man than his book. But that wasn't the point. All I wanted to do was lead the way suggesting new topics. Here's something to think about. Lumpers and Splitters: Is the designation of species determined solely by our perception of it? Is there a standard established to tell us when shell characteristics (or how many variants) warrent the designation of "new species". Beauty may be in the eye of the beholder, but I would think "species" would have a more scientific backing. It does seem that the eye of the beholder determines speciation. If no such standard exists, can we establish one? Will such a standard vary from family to family? Art