Thanks again to all who have offered their comments. Bear in mind my intent was not to be at all critical of the filter, just to provide a good set of photos of how it was constructed, since I had not seen any posted here before. I think that it is a quality filter, just that this one happened to get left on a bit too long, mostly due to lazyness, bad weather, and the venerable old Volvo not being the "new" car anymore. I hope all who responded did look at the full set of pictures linked in the original post- not just the one that shows the void.
To provide answers to several questions:
Yes, it was on all through winter.
Yes, we do meet requirements for highway driving. (Almost always 7+ miles, usually 18 to 35 depending who drives it to work.)
It's oil change history is- we bought it at 28,000 miles. The lady that owned it took it to the dealer for an oil change only when the "needs service" light went on every 10,000 miles. Unfortunately, she did drive mostly short trips. For most of it's life, it got changed at the dealer on the even 10,000 mile intervals, and by myself in between at 5000 mile intervals. I only used the OEM filters. I had cut open several filters before, never saw a problem. This was the first one that I had where I had let it go the full 10,000 miles. Was surprised to see the rip myself. My conclusion was basically this: It's well made, but I do not see anything mystical about it. Since it's a long haul to go to the dealer, plus I have to leave work early to get there when they are open, for the most recent change I decided to try a Wix 51311, which I can get here in town. Since the dealer used Mobil 10-30 dino I have continued using it with what seems to be good results- minimal consumption and no smoke at 193,000 miles. But in the future I think I will stick to 5000 miles or 6 months for changes.
I am very concerned about the recommendation of my wife's MINI Cooper for 15,000 mile changes. While yes, the recommended synthetic oil may be up to it, I am worried the filter may not be. I think I may begin doing an intermediate change at 7500 mile intervals myself. I am curious to see just how much different the cartridge it uses looks from the spin on elements we have examined.