After looking at those pics i'm beginning to think they were all trochus snails now. And I must have removed about a dozen or so babies already. I dont recall seeing any type of spike on them like in the photos. The next time I pull one out i'm going to take a long close look at it.
minus9 - if you could post those pics when you have a chance i'm curious
http://melevsreef.com/pics/0705/sundial_top.jpg
They are very segmented.