Achanarras Revisited. 285 
(including Robert Dick’s specimens), and C. W. Peach—as 
well as by Messrs J. Reid, W. Tait Kinnear, and D. 
Calder.! 
Homacanthus borealis, Traq. Dipterus Valenciennesti, Sedgw. and 
Rhadinacanthus longispinus (Ag. ). Murch. 
Mesacanthus Peachi (Kgert. ). Gilyptolepis paucidens (Ag. ). 
Cheiracanthus sp. (perhaps 2 species).  Thursius macrolepidotus (Sedgw, and 
Coccosteus decipiens, Ag. Murch. ). 
5 minor, H. Miller. Thursius pholidotus, Traq. 
Homosteus Milleri, Traq. Osteolepis microlepidotus, Pander. 
Seales doubtfully resembling those 
of Gyroptychius, 
Here we have undoubtedly a number of species also 
found in the list from Achanarvas, these being Rhadinacanthus 
longispinus (Ag.), Coccosteus decipiens, Ag., Homosteus Milleri, 
Traq., Dipterus Valenciennesti, Sedgw. and Murch., and 
Glyptolepis paucidens (Ag.)—probably, also, Cheiracanthus 
Murchisoni, Ag.—while the Mesacanthus of Achanarras 
may be M. Peachi, Egert. But we have also Coccosteus 
minor, H. Miller, Osteolepis microlepidotus, Pander, Thursius 
macrolepidotus (Sedgw. and Murch.), and Thursius pholidotus, 
Traq., species which do not occur at Achanarras, and are 
also, apparently, absent both from the Orkney beds and 
those of the shores of the Moray Firth. On the other 
hand, Achanarras gives us, besides the unique Palao- 
spondylus Gunnt, Traq., also Pterichthys Milleri, productus, 
and oblongus, Ag., Osteolepis macrolepidotus, Ag, and 
Cheirolepis Traili, Ag., which have certainly been found 
nowhere else in Caithness, and we also have Diplacanthus 
striatus, Ag., and Diplopterus Agassizii, Traill, of whose 
1 It will here be seen that I have put aside the localitated list of Caithness 
fossil fishes, given by Sir A. Geikie in his paper On the Old Red Sandstone 
of Western Europe (Trans. Roy. Soc. Edin., vol. xxviii., 1878), but this 
involves no disrespect to the memory of my deceased friend, Mr C. W. 
Peach, by whom the list was principally compiled. For at that time, 
sixteen years ago, we knew very much less about the generic and specific 
characters of the Old Red Sandstone fishes than we do now; in fact, the 
‘*Systematik ” of the subject was pretty much in a state of chaos, and it was 
not until ten years afterwards that I first attempted to put some order into 
this chaos, in my paper, Notes on the Nomenclature of the Fishes of the Old 
Red Sandstone of Great Britain—Geol. Mag. (3), vol. v., 1888, pp. 501-517. 
A new list remains yet to be published. 
