232 CATALOGUE OF THE FOSSILS OF THE PERMIAN SYSTEM 
general form.”"—Ag. It is frequently found in the before men- 
tioned localities. 
Last summer, while working some Marl-slate in Cullercoats 
Bay, to which our attention was directed by Mr. A. Hancock, we 
obtained two specimens of a Paleeoniscus which differ in a few 
particulars from the ordinary appearance of P. comtus. The 
body, fins, and scales, are rather larger and stouter than we have 
seen in the above species. The scales are nearly square, very 
closely punctured, and the posterior margin is finely and closely 
serrated. Without a more complete specimen we cannot be cer- 
tain that it is distinct. 
2. P. ntucans, Sedgu. 
Palconiscus elegans, Ag., Poiss. Foss. ii., p. 95, pl. 10 b, 
f. 4, 5. 
Paleothryssum elegans, Sedgw., Geol. Tr. 2nd ser., iii., p. 
Dolo ete 
In the Marl-slate; rather rare. Ferryhill, Thickley, Mid- 
deridge, Whitley, Cullercoats Bay. 
“The P. elegans is distinguished from the other species of this 
genus by its more elegant form and well-proportioned dimen- 
sions. Its head equals about one-fifth of the whole length of the 
body. The surface of all the head bones is ornamented with 
diverging rays in the direction of their growth. The pectorals, 
ventrals, dorsal, and anal, are proportionally small. The trans- 
verse articulations of the dorsal and anal are always very distant, 
but they do not appear to be so, because these divisions alternate 
from one ray to another. The tail has exactly the same form as 
that of the P. Frieslebent of Germany, but the superior lobe 
is narrower, and the inferior is longer, than in that species. 
It is this appearance which has caused Professor Sedgwick to 
remark that the lobes of this fin were less unequal than in the 
other species. Its rays are also very slender, and as they are 
continually bifurcated almost from their base, they appear yet 
more fine and slender. ‘The transverse articulations of the rays 
of the superior lobe are so close that they appear but little 
longer than wide, but those of the inferior are more distant. 
The scales are nearly of the same form on all parts of the body, 
