We don't see this species that often in northern California, but yesterday (25 May 2019) I photographed a live snail, so here's the view from below showing the head and foot, eyes, and tentacles:
The eye stalks are yellowish with blue and black pigment at the tips.
The two cephalic (head) tentacles are long and emerge from between the eyes.
The large foot is retracted in the photo above, but note the dramatic black and white (and brown and white) stripes.
You can also see the epipodial tentacles arrayed around the foot (on the left side in the photo below). These tentacles help the snail sense its environment.
Although its shell might be considered "dusky" by some, the snail itself is quite boldly patterned!
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