REPORT ON FOSSIL FISHES. 17 
Concerning the above list, there are three things which principally strike 
the attention,— 
1. The occurrence of a large number of forms perfectly new to science. I 
have endeavoured most strenuously to avoid all undue multiplication of genera 
and species ; indeed, I may have erred in the opposite direction ; yet out of 
twenty-eight species of Ganoids occurring in these beds, at least twenty 
must be described as previously unknown. Of fourteen genera, five are new, 
namely, Phanerosteon, Holurus, Canobius, Cheirodopsis, and Tarrasius, while 
the last named genus is altogether so peculiar that I can find no place for it 
in any known family. Some amount of change in our notions of the definition 
and limits of the family Paleoniscidz will also be necessary, if the genera 
Holurus, Phanerosteon, and Canobius are to remain where I have placed 
them. 
2. The absence or paucity of forms characteristic of rocks of similar age on 
the northern side of the southern uplands of Scotland. There are no remains 
which can with certainty be referred to the genus /hizodus, which in central 
Scotland occurs abundantly from the bottom of the cement-stone group upward 
through the Carboniferous Limestone series. The well-known Hurynotus 
crenatus of Mid-Lothian and Fifeshire is represented only by a few scales and 
bones from Liddisdale. And as regards the Palzeoniscide, all are new save 
one, which I refer, not without doubt, to Ahadinichthys Getkiei, a species de- 
scribed by myself in 1877 from the Wardie shales of Colinton, near Edinburgh. 
Even the characteristic Cement-stone and Edge-coal type of the genus Elon- 
ichthys, that of Elonichthys Robisoni, is represented only by one rare species, 
Elonichthys serratus, and that also new. 
3. The passing down into the Calciferous Sandstone Series of genera, 
hitherto known as characteristic of the Coal Measures or Upper Carboniferous 
series of rocks, although most of these have, it is true, occurred sparingly in 
the Carboniferous Limestone series. Strepsodus, Coelacanthus, and Platysomus 
are best known to us as Coal Measure genera; and although fragmentary 
remains of them have been found also in rocks of the Scottish Carboniferous 
Limestone series, their appearance in the subjacent Calciferous Sandstones is 
now observed for the first time, while Cycloptychius has not hitherto occurred 
in any horizon below the Millstone Grit. 
