shaped, descending abruptly in the centre, where rises a cup-like mouth of a greenish hue, formed of thin membrane, capable of considerable motion, sometimes taking a circular shape, and at others wrinkled into four lobes or lips, strongly reminding one of the peduncle of many Medusæ. Each of these lobes corresponds with one, taken alternately, of the marginal angles, as do also four black spots, rising from the interior of the body, and projecting into the disk immediately around the mouth. These spots are the summits of as many dark bands that are seen running down the body longitudinally, and which appear to be connected with the ovaries, for each of them is bounded by a series of pale egg-like bodies, the upper extremity of each series running off in a number of globular white corpuscles towards each of the eight marginal interspaces.
The general colour of the animal is a pale dusky brown or grey, the tint becoming warmer in some parts. The translucency of the integument reveals the internal organs, and hence the light and dark bands already spoken of are conspicuous.
When I discovered the little creature it was attached by its foot to a fragment of rock. For convenience of examination I gently dislodged its sucker, as I would have removed an Actinia, supposing it would soon adhere to the sides of its vessel. While I had it, however, it shewed no inclination to refix itself, but lay at length on the bottom. The tentacular disk is habitually expanded, and it is not at all timid or impatient of handling. If rough usage be applied, and especially if it be lifted out of the water, it pre-
