ce 
wo 
— 
ANIMALS. 
Sus-K1Incpom VERTEBRATA, Cuvier. 
Of the present division of Animated Nature, Fishes and Reptiles are the only 
groups requiring notice in this Monograph ; since no remains of Birds and Mammals 
have yet been found in deposits belonging to the Permian period. 
Class Pisces, Linneeus. 
According to the system of Agassiz, this class consists of four orders, namely, 
Placoidei, Goniolepidoti, Ctenoidei, and Cycloidei. Of these, the first two alone require 
consideration in this Monograph, as all the Ichthyolites of the Permian age are 
referable to them. 
Order PLACOIDE!, Agassiz. 
PuLaciostomi, Cuvier. 
Family CESTRACIONTIDA, Agassiz. 
Genus Gyracanthus, Agassiz. 
GYRACANTHUS FORMOSUS, Agassiz. 
PETRIFIED woop, Ure. History of Rutherglen, pp. 303, 304, pl. xii, fig. 6. 
A REMARKABLE FossIL,! J. de C. Sowerby. Zoological Journal, vol. ii, pp. 252, 253, 
pl. vin, fig. 9. 
GYRACANTHUS FOoRMOSUS, Agassiz. Poissons Fossiles, vol. iii, p. 17, pl. v, figs. 4-8. 
— — ss King, Catalogue, p. 14, 1848. 
— Howse, Trans. T. N. F. C., vol. i, p. 237, 1848. 
“The Newcastle Museum possesses a fragment of a fossil, which I am happy in 
making out to be an Ichthyodorulite or dorsal spine of an extinct family of sharks. It 
is the impression of the inferior part of the anterior face, showing the entire length of 
the root and a small portion of the obliquely ridged part: the root is longitudinally 
striated, and the obliquely ridged part tapers off to a point on the mesial line of the 
anterior face: the point is an inch and a quarter from the termination of the root. I 
feel persuaded that it is the Gyracanthus formosus.”” 
1 Mr. Sowerby adds, ‘‘ most probably belonging to a Fish.” 
2 King, Catalogue, p. 14. 
