Mineralogy and Geology. 131 
4, The larger part of comprehensive types have become extinct, or 
neatly so, Cystideans, Cyathonhylloid corals, Trilobites, Labyrintho- 
donts, Enaliosaurs, Lepidodendrids, Sigillarids, the Dinothere, Sivathere, 
and others, are extinct; and Brachiopods, Crinoids, Ganoids, Cycads, 
etc., are far less numerous than in a former age. The extinction of an 
e fishes, excepting the Selachians, were Ganoids; the Mamm 
were mostly, at least, Marsupials, and were allied to Reptiles in being 
sem arous and in some other points. The coexistence of birds of 
4 type having some reptilian characteristics, along with the Marsupials 
and Ganoids and the various Reptilians, would have made, for the age, a 
the new s ecimens are of this class. At the same time it is to be con- 
=e Flying reptiles are exemplified in the Pterodactyl, the wings of 
ich were form , hearly n bats, by an expansi i 
— Was by dh 
fa 2 two totally distinct methods of providing for the same variety of 
ne in one single class of animals—which is altogether contra- 
Saag The Pterodactyl seems to teach which is the true reptilian 
ethod, 
[From an article by Mr. Henry Woodward in the “ Intellectual Ob- 
Server” for December, 1862, (an excellent scientific Journal of a popular 
articulars. The paper came into our hands after the above was in oe 
fs accompanied by a beautiful plate of the fossil. The relation to 
