FISHES OF THE CARBONIFEROUS SYSTEM. 187 
Most of them are small, with highly ornamented scales and head plates, hav- 
ing a marked resemblance to those obtained from the Lower Carbonifer- 
ous shales of Burdie House and Eskdale, in Scotland, and described by 
Agassiz and Traquair. They have all been included in the old genus 
Paleoniscus, but in the subdivision of that genus by Dr. Traquair they fall 
partly into the genus Rhadinichthys and partly into Mlonichthys. The follow- 
ing species have been enumerated : 
Palaoniscus Alberti, Jackson. 
re Cairnsii, Jackson. 
ce Brownii, Jackson. 
ce Jacksonii, Dawson. 
co modulus, Dawson. 
The number of individuals found at this locality is enormous; the sur- 
faces of the shale being sometimes completely covered and the fishes often 
overlying each other, showing that they were literally buried in heaps. 
They were probably the inhabitants of a body of fresh water, and were 
killed simultaneously by thousands in some general catastrophe. 
Sir William Dawson has also noticed! some remains of fishes found in 
the Lower Carboniferous rocks at Horton Bluff, New Brunswick, and has 
described a species of Rhizodus (R. Hardingi, Daw.,) and one of Acrolepis 
(A. Hortonensis, Daw.). 
Dr. Joseph Leidy has described and figured® a number of fish teeth from 
the Carboniferous limestone of Illinois and Missouri; these include several 
species of Cochliodus, which would now be referred to Deltodus and Psephodus, 
and one species of ‘“ Ctenoptychius,” which is a Dactylodus reversed. 
William McAdams, of Alton, Il, has recently sent to me some large 
fish jaws taken from the Carboniferous limestone which are unlike any- 
thing before found in our Carboniferous rocks. They include jaws of a 
new species of Rhizodus resembling R. Hibberti of the Lower Carboniferous 
rocks of Scotland, and jaws, teeth, and bones of another large Ganoid allied 
to Rhizodus, which I have called Celosteus from its hollow bones. These 
will be found described below. . 
' Acadian Geology, p. 253, et seq. 
2Trans. Am. Philos. Soc., vol. 11, 1860, p. 87. 
