[Read before the Otago Institute, 14th September; 1874.]

Actinia thompsoni, sp. nov.

A lateral grower.—Body, 1 inch long; striped vermilion and whitish-yellow, nearly all red, striæ entire; peristomic rim wide; tentacles round on trans. sect., conical in general form, half-inch long; shafts yellowish-white, tips purple, latter slightly shaded off as it passes into the shaft of tentacle, in three alternate rows of about twenty each.

At very low water, Deborah Bay, Port Chalmers, rocks.

Two others, one pale, half-inch long; striped vermilion-red and white; tentacles not tipped with purple; the other like A. messembryanthemum of Britain.

Named in honour of Captain Thompson, harbour-master.