N early twenty-one years ago, the late Prof. Drummond placed in my hands some fragmentary fish-remains which he had brought with him from Maramura in Nyasaland, desiring me to write a few words about them, to be inserted in his book on ‘Tropical Africa,’ then in the press. The specimens were unfortunately very fragmentary, consisting, except in one case only, of detached scales and bones, and the time allowed me to make up my mind about them was only a couple of days; however, I gave names to two of them. One was a piece of the hinder part of a fish, evidently a member of the family Palæoniscidæ, to which I gave the name of Acrolepis (?) drummondi ; the other was a detached scale which I supposed might also be palæoniscid in its nature, and doubtfully referred to the same genus under the name of Acrolepis (?) africana . Concerning the latter scale, I also noted that it bore considerable resemblance to some of the scales from the European Trias named by Agassiz ‘Gyrolepis.’ I had not then seen the paper by the late Prof. Dames on the Ganoids of the German Muschelkalk, which was published in the same year (1888); when I did see it, I was struck by the general resemblance which this scale bore to those of Colobodus , as figured in that memoir, and especially to those of Colobodus frequens , Dames. Some little time ago, Dr. A. S. Woodward, F.R.S., knowing that these two types were in Edinburgh