This morning, he finally did! This is Pete. He was sold to me as a Vulgaris and, if he is, he is just a baby! His mantle is maybe a couple inches (at most). All I really know about him is that he was sourced from the Caribbean.
I've already observed some interesting behavior (which is shown in the pics). I must have startled him this morning because his reaction was to stock his mantle straight up and away back and forth. I think he was trying to look like algae.
I am concerned he might not be a Vulgaris. I know there's a possibility he is a mature dwarf, but I'm hoping I won the lotto and got a baby Vulgaris. Perhaps someone could help me positively ID him?
Without further ado, here are some pictures!