144 NOTICES OF THE MEETINGS [March 5, 
flying lizards, and several genera of Crocodilians and Chelonians. 
Examples of marine and fresh-water turtles are not uncommon 
in the Wealden deposits; and the strata near Swanage have 
furnished many beautiful specimens to the researches of Mr. Bower- 
bank. 
Of Fishes there are nearly forty known species in the Wealden, 
which are chiefly referable to the Ganoid and Placoid orders. The 
fishes most abundant in the rivers of the Jguanodon country were 
two or three species of Lepidotus,— ganoids closely allied to the 
Bony or Gar-Pike of America; their teeth and scales are everywhere 
to be met with in the Tilgate strata. 
The Invertebrate Fauna comprised many genera of Insects, a 
few Crustaceans, and numerous fresh-water Mollusca. The Insects 
(for a knowledge of which we are mainly indebted to the scien- 
tific acumen of the Rev. P. Brodie) amount to several hundred 
specimens, comprising between thirty and forty families or genera, 
and are referable for the most part to the orders Coleoptera, Or- 
thoptera, Neuroptera, Hemiptera, and Diptera. Among them are 
several kinds of Beetles, Dragon-flies, Crickets, May-flies, and other 
familiar forms which are closely allied to species that inhabit tempe- 
rate climates. 
Mollusca. The most numerous shells belong to the genera Cyclas 
and Paludina ; of the latter, which is a genus of fresh-water snails, 
there are a few species that abound in the Wealden Clays and 
Purbeck beds, and form extensive strata of shelly limestone, the 
compact masses of which are susceptible of a good polish and are well 
known by the names of Sussex, Petworth, and Purbeck Marble; the 
latter was in great request in the medieval ages, and is the material 
of which numerous tombs and monuments, and cluster columns in 
our ancient Cathedrals are constructed. Two common inhabitants 
of our pools and streams, the Planorbis and Limneus, also occur. 
Several species of Unio, some of which rival in magnitude the pearl- 
mussels of the Ohio and Mississippi, likewise abound in the Wealden 
deposits. Fresh-water Entomostraceans, Cyprides, of several species, 
swarm in many of the clays and iron-stone beds of Sussex and the 
Isle of Wight. 
The Fuiora of the country of the Iguanodon appears to 
have been as rich and diversified as the Fauna. Forests of 
Conifere, referable or closely allied to Abies, Pinus, Araucaria, Cu- 
pressus, and Juniperus, clothed its hills and plains: with these were 
associated arborescent and herbaceous Ferns, comprising upwards 
of thirty species; together with many Cycadeacee, and trees allied to 
the Dracena, Yucca, &c. Equistaceous and Lycopodiaceous plants 
also abounded ; and even the common inhabitants of our streams, 
the Chare, flourished in the rivulets of that marvellous region. 
As examples of the vegetation of the Wealden period, Dr. 
Mantell described the petrified forest of conifer and cycadez in 
the Isle of Portland: the accumulation of fossil firs and pines 
exposed on the southern shore of the Isle of Wight ; and the coal- 
field of Hanover, which entirely consists of the carbonized foliage, 
—————En 
