31 
example of Cestraciontidae, and where the Marsupials abound which characterised 
the Oolite. In the Australian seas live the Terebratula and Trigonia, and in the 
Australian forests grow the Zamia, Cycas, and Araucaria, all which have left their 
remains plentifully scattered throughout the Oolitic rocks. 
The two families of corals, Turbinolidse aod Oenlinidge first appeared at this 
period. Conchifera, or bivalves, became much more numerous, and also carni- 
vorous Gasteropods, which are thus known by the notched lip and canals to the 
mouth. Here the Oolitic Cuttlefish, the Ammonites, flourished, lived, and died, 
and as we find whole generations present, of all ages, it follows that the deposL 
tion of the Oolitic beds must have occupied a very long time. The Belemnites, 
which resembled our Squids, were, if possible, still more abundant, and we very 
frequently find their ink-bags, containing the sepia, as serviceable for painting as 
ever. The Encrinites now are decreasing, only one species is found at Dundry, 
the Pentacrinus Milleri. 
But on the other hand, the sea urchins are very numerous, more than 600 
having been described from the Jurassic strata. Crustaceans, like our own lob- 
sters, occurred in considerable number ; one, Glyphea rostrata, is found in the 
Dundry beds. Now and then beautiful remains of insects meet the collector's 
eye, especially at Stonesfield. Homocercal fishes bear about the same proportion 
to Heterocercal as in the present day, the latter having before been the most abun- 
dant. In these strata the paleontologist first meets with the true sharks and rays 
(Squalidse and Raiidse). Most of the fish, however, are Ganoid. Reptiles attain 
their greatest size and number at this period — Ichthyosauri, Plesiosauri, and Teleo- 
sauri abundant in the water and on banks, while on the land stalked the immense 
Megalosaurus, about 30 feet long. The teeth of this animal were very peculiar, 
being sharp, serrated, and recurved, they had the properties of sabre, knife, and 
saw. The singular flying reptile was a companion to these, the Pterodactyle, a 
true Saurian, with long jaws and sharp teeth, four legs and claws. The fifth digit 
of the fore-paw was elongated, from which a webbed skin extended to the hind 
leg, so that the animal could skim along like the flying squirrel of America. 
The Dundry Oolitic beds have the same dip as the turnpike road, so that after 
passing up the hill over the Lower Lias, which has a thickness of 500 feet, the 
first thing to be noticed is the 
Marlstqne, which has been said by Mr. Etheridge, and others, to be altogether 
absent. I have here, however, a piece of the rock with the Ammon. 
Thomasensis, radians, Aalensis, variabilis, &c, and this specimen you 
could not distinguish from the other collected at Stroud. Instead of the 
thickness it is found there, it is only from 8 to 12 inches at Dundry. It 
may be seen at the cross roads, and by a stile, in a lane to the west of 
the village. Above this are about 7 or 8 feet of 
Upper Lias Clav, a stiff bed of blue clay, on which is Belemnites bipartitus, 
Am. bifrons, A. communis, Pholadomya, and Modiola. 
Upper Lias Sands lie above this, and attain, on the south and west of the hill, 
a thickness of a couple of feet. In the upper portion of these, just 
under the Ironshot bed, have been found several new species of Theci- 
dium, Zellania, and Spirifera, also a small branching zoophyte, Hefceropora 
ramosa. In these also occur Modiola plicata, Pholadomya arenacea., 
Lima bellula, Belemnites irregularis, and B. compressus* 
