OF NEW SOUTH WALES. 347 These increase in length ventrally ; the outer setae, i.e., those nearer the dorsal surface — being very short. The ventral setae, which are fairly numerous, are of two kinds ; those of the one kind, of various lengths, are smooth and bifurcated ; the shorter branch being well developed, of about one-third the length of the longer, which has a strong bend outwards, and terminates in a blunt apex. The others are fewer, and of a very unusual shape. They have a slender stalk of varying length, but always much shorter than the longest of the other variety, and divided by a longitudinal dark line. This stalk bifurcates, the branches being much stouter than the stem, and of somewhat complex form. The shorter branch is somewhat club-shaped, and curved slightly outwards to a blunt apex ; the longer branch is narrower than the other at its base, but expands into an extremity with some-what the form of a bird's head — the " beak " being turned out-wards ; the narrower stalk of this branch — representing the neck of the bird — follows the curvature of the smaller branch ; and both the apposed borders are lined with a series of small ser-rations. Hab. Darnley Island. (Chevert Exped.) ESSAY ON THE ICHTHYOLOGY OF PORT JACKSON. By Count F. de Castelnau. My intention is to give in this paper a list of all the species of bony fishes (teleostei) that hav3 up to this day been observed in the great Harbour of Port Jackson, ar.d i i its immediate vicinity. I know that this catalogue will be found very incomplete ; it must only be considered as giving, as far as possible, the list of the sorts that have been quoted by authors as having been found at Sydney, and of all those I have, during a stay of nearly two years, been able to collect by daily visits to the fishmongers. Of those I have seen in a fresh state, I give a particular notice and a description of their colours, &c ; this having generally been omitted by travellers ; and most being only known from discoloured specimens in European Museums.