428 CLASSIFICATION OF DEVONIAN FISHES 
of Agassiz, the ventrals having been mistaken for an anterior 
anal, and he describes and gives a sketch of the sculptured outer 
surface of the scales. 
Professor Pander, in the Monograph already cited, has carried the 
work of rectification still further, though even he ventures upon no 
restoration of Glyptolepis, seeming to be unacquainted with the 
figure of the body of the fish, from a specimen more complete than 
any of those of Agassiz, or of his own, given by Hugh Miller. 
In addition to what was already known, he states that the prin- 
cipal jugular plates are separated, anteriorly, by a small rhomboidal 
one, and he makes the observation that “these plates, which among 
“living fishes occur double only in Polypterus, and are among fossils 
“known only in Osteolepis, Diplopterus, Megalichthys, and Gyropty- 
“ chius, lead to the supposition that the composition of the cranial 
“and facial bones will differ in no important respect from what is 
“found in them ;” and this supposition is, he states, confirmed by 
the similarity of the upper and lower jaws and teeth. Behind the 
jugular plates, and applied to their hinder edges, Professor Pander 
finds two others, which meet in the middle line, and resemble those 
which lie upon the under surface of the pectoral arch in Polypterus. 
The scales are, in general, rounded, sometimes circular, sometimes 
oval, sometimes more or less quadrate, by reason of the less rounding 
off of their angles. They overlap in different degrees, and their 
external sculpture is different in different parts of the body, whence 
arises such an amount of unlikeness, that different species might 
readily be founded on scales from different regions. 
The sculptured surface presents two divisions, one, more anterior, 
exhibits small tubercles with projecting points, which are convex 
posteriorly, concave anteriorly, and are disposed in regular series 
converging towards a central point, which, however, they do not 
reach. 
The posterior segment is covered with wavy longitudinal coste, 
which gradually diminish in thickness from the anterior towards 
the posterior edge. 
Professor Pander gives a figure of this peculiar sculpture, a 
woodcut copy of which I subjoin, and side by side with it a careful 
drawing of the sculpture of the scale of a Glyptolepis from Wick, in 
an even better state of preservation. 
There can be no doubt that the scales of Glyptolepis possess the 
ornamentation here represented. Not only does Professor Pander 
positively state that the scale figured by him was worked out from 
a Lethen Bar nodule, and formed part of the unquestionable 
