lated, and the margin of the mantle studded with little bundles of bristles, about nine or ten on each side. It varies in colour, but is generally greyish, or dusky olive. I have dredged it of large size in Weymouth Bay, attached to oyster-shells. A much smaller species is also common in that locality (C. cinereus), which occurs in the pools and on the ledges of the shore, near low-water mark.
When put into a glass of sea-water, the Chitons are sluggish, often remaining for days rolled up before they begin to adhere, and then remaining a long time inert on the same spot.