THE ANNALS AND MAGAZINE OF NATURAL HISTORY. [SEVENTH SERIES.] No. 8. AUGUST 1898. XIII. — Further new Parasitic Gopepods found on Fish in the Indo-tropical Region. By P. W. Bassett-Smith, Staff-Surgeon R.N., F.Z.S., F.R.M.S. [Plates III. -VI.] During the past year, owing to H.M.S. ' Cossack' having visited a variety of harbours in the Indo-tropical region, the opportunity has been given me of adding considerably to what I had already seen at Bombay of these curious little parasites; continued research has shown very clearly that they are abundantly represented. In most cases, when inspectino-any number of well-grown fish (for it is certainly more common to find the mature fish infested with one or more parasites than the younger ones), careful examination would bring to light some actively moving Caligus in the gill-cavity or perhaps a more bizarre and anomalous form, attached to the lips, body, or elsewhere. One point has been very strongly impressed on my mind, namely the constancy with which most of them are found on any particular kind of fish ; and one can predict with almost certainty the form that will be found, though at the same time it appears that one species may at times be taken on two or more distinct " hosts." As is only to be expected when the fish in this region are com-paratively so little known, very few of these small parasites Ann. & Mag. N. Hist. Ser. 7. Vol. ii, 7
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