110 Scientific Intelligence. 
which was placed beside it, were pointed out, and the remarkable modi« 
fication of structure presented by the ulna was explained. The arm- 
bone of the P. Conybeari is 54 inches long, the corresponding bone of a 
Gavial or gangetic crocodile 18 feet long, in Dr. Grant’s Museum, i 
but 114 inches; the humerus discovered by Mr. Beckles is 224 inches 
in length, and the bones of the fore-arm are 16 inches long. A pore 
tion of the scaly cuirass which covered the limbs and is composed of 
hexagonal plates, were exhibited. 
The lecturer then took a rapid view. of the other reptiles that were 
contemporary with the Iguanodon, enumerating the Pterodactyles or 
flying lizards, and several genera of Crocodilians and Chelonians. 
Of Fishes there are nearly forty known species in the binge 
fishes most abundant in the rivers of the Iguanodon 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. . ‘ 
Insects.—The Insects (for a knowledge of which we are mainly in- 
tera, Orthoptera, Neuroptéera, Hemiptera, and Diptera. Amongt 
are several kinds of beetles, dragon-flies, crickets, May-flies, and other 
familiar forms which are closely allied to species that inhabit temperal 
climates. 
Moillusca.—The most numerous shells belong to the genera Cyclas 
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mostraceans, Cyprides, of several species, swarm in many of the clays 
and iron-stone beds of Sussex and the Isle of Wight. 
The Flora of the country of the Iguanodon appears to have been a8 
rich and diversified as the Fauna. Forests of Conifer, referable of 
closely allied to Abies, Pinus, Araucaria, Cupressus, and Junipertss 
clothed its hills and plains ; with these were associated arborescent and 
‘erbaceous Ferns, comprising upwards of thirty species ; together Ww! 
