In the present paper I propose to give the result of my examination of the specimens of fishes which were obtained by Mr John Murray on the West Coast of Scotland, whilst dredging during the last eleven months on board of the “Medusa.” Exact observations as to the bathymetrical distribution of British fishes at certain seasons and localities, such as have been obtained during the cruises of the “Medusa,” are much needed, and if methodically carried out for some years, will prove a most valuable contribution to the British fauna, especially if they are supplemented by similar reports on the invertebrates which were collected simultaneously with, and form part of the food of, the fishe.