236 CATALOGUE OF THE FOSSILS OF THE PERMIAN SYSTEM 
wrinkled striz. This fish measures about eight inches and 
a half in length, and the greatest width is about five and a half. 
Famity. Savrorpss, Ag. 
3. ACROLEPIS, 4g. 
1. A. Sepewicku, Ag. 
Acrolepis Sedgwicku, Ag., Poiss. Foss. ii., p. 80, 2° ptie., 
pl. 52.—Sedgw., Geol. Tr. 2nd ser., ii1., pl. 8. 
In Marl-slate ; rare. Ferryhill. 
“The finest specimen of this rare species was in the possession 
of the late H. T. M. Witham, Esq. Fragments are also in the 
possession of Lord Enniskillen and Sir Philip Egerton.”—Ag. 
4. PYGOPTERUS, 4g. 
1. P. manprsunaris, Ag. 
Pygopterus mandibularis, Ag., Poiss. Foss. i1., p. 76, 2° ptie., 
pl. 53, 53 a.—Sedg., Geol. Tr. 2nd ser., iii., pl. 10, 11. 
Im Marl-slate; rather rare. Whitley, Cullercoats, Ferry-hill. 
“This fish is of a great size, lanceolate form and remarkable 
for the extraordinary development of the fins. The tail is very 
large, widened, and composed of a considerable number of rays, 
which are very much subdivided in the middle. The upper lobe 
is covered with scales, nearly to its extremity. The scales are of 
an uniform size on all parts of the body. The surface is finely 
dotted, but the dots are so small that they cannot be seen with- 
out alens. The posterior sides of the scales are not serrated.” —A g. 
2. P. scunptus, Ag. 
Pygopterus sculptus, Ag.. Poiss. Foss. ii., 2° ptie., p. 77. 
M. Agassiz who has indicated but not yet described this species, 
says “It comes from the same bed as the P. mandibularis, but dif- 
fers from it in the ornaments of the scales, which are sculptured. 
Its form is short and thick.” 
Famity C@LacantuEs, Ag. 
5. CHLACANTHUS, 4g. 
1. C. granuLatus, Ag. 
Celacanthus granulatus, Ag., Poiss. Foss. ii., pl. 172, 2° ptie. 
jo, G2, 
