CLASSIFICATION OF DEVONIAN FISHES 429 
Glyptolepis represented in his Plate 7, fig. 4; but the specimen of 
Glyptolepis leptopterus represented by Agassiz in the “ Vieux Grés 
Rouge,” Tab. 21, fig. 2, and now in Sir Philip Egerton’s collection, has 
obviously sculptured scales and cranial bones. And I find that by 
scraping away the inner layers of the scales of undoubted examples 
of this genus, in the Museum of Practical Geology and in that of the 
Royal College of Surgeons, the points and ridges of the sculpture 
remaining imbedded in the rock are easily displayed. The clear 
recognition of the fact that this elegant structure really characterizes 
+) 
Fig. 6. The two left-hand figures represent the scale rom Wick of the natural size and 
ils sculpture magnified ; the right-hand figure is copied from Pander’s Monograph. 
Glyptolepis is of great importance, for, in the first place, it enables 
one to discriminate between Holoptychius (whose scales have no 
semilunar area of backwardly directed points) and Glyptolepis, and 
in the second place, it places beyond a doubt the justice of Professor 
Pander’s conclusion that the scale figured by Miller in the “ Footprints,” 
as appertaining to As¢erolepis, really belongs to Glyptolepis. 
Pander states that the rays of the median fins are supported 
upon long interspinous bones, and that the paired fins are very 
much approximated ; the very long pectorals extending far beyond 
the bases of the ventrals, which are very broad and strong. 
Specimens which I have examined show, that the parietal bones 
of Glyptolepis are large, and, like the frontals, distinct from one 
