GALLERY.] 
NATURAL HISTORY. 
71 
Ichthyosaurus ;—another species of gharial (considered a distinct genus, 
bearing the name of JEolodon ) from the lias at Monheim in Franconia, 
being the unique specimen described and figured by Soemmerring in 
the Memoirs of the Academy of Munich, under the name of Crocodilus 
prisons ;—ahead of Crocodilus Toliapicus, mentioned by Cuvier as Cro¬ 
codile de Sheppey ;—the head and other parts of the Geosaurus (the La- 
certa gigantea of Soemmerring) found together with the preceding, and 
figured and described by the last mentioned naturalist in the Trans¬ 
actions of the Academy of Munich;—the interesting groups embedded in 
two slabs of limestone of the well known Swanage Crocodile (a distinct 
genus) and one of the principal specimens of the Mantellian collection ; 
—the lower jaw and other parts of the cranium, vertebrae, &c., of the 
huge reptile ( Mososaurus Sancti Petri) from the St. Peter’s Mountain 
near Maestricht, presented, in 1784, by the celebrated Peter Camper, 
and figured by Cuvier;—a portion of a new species, from Lyme Regis, 
of the remarkable genus of flying reptiles, the Ptrodaciylus of Cuvier, 
described and figured by Buckiand in the Transactions of the Geological 
Society, under the name of P. macronyx • together wdth a coloured 
cast of Pterod. longirostris of Cuvier from Solenhofen, the quarry 
of which place has also furnished the small lamina of lias on which may 
be observed the impression (with some of the osseous substance re¬ 
maining) of the last two articulations of the toe of a flying animal, con¬ 
sidered by Spix as related to the Vampire, but which is more probably 
a large and distinct species of Pterodactyle. 
The whole of Case 4 is occupied by the osseous remains of Iguano- 
don, chiefly from the strata of Tilgate Forest in Sussex; a suite, 
which, together with the great group of bones from Maidstone embedded 
in Kentish rag, (in a separate glass Case placed at present under the 
central window,) has furnished Dr. Mantell wflth highly valuable 
materials for the illustration of that extraordinary reptile, scarcely less 
remarkable in its osteology than the gigantic animal (Wall Case 2) of the 
same order, discovered by that naturalist, and to which he has given the 
name of the Wealden Lizard ( Hylceosaurus ,) to express the circum¬ 
stance of its occurring in the strata of that geological formation. 
In the Wall Cases 5, 6, 7, of this Room, and in all those of Room 
IV., are arranged the order Enaltosauria, or Sea Lizards, of the sub¬ 
division of which the genera Plesiosaurus and Ichthyosaurus are the 
principal types. Among the species of the former may be particularized 
the Plesiosaurus Hawkinsii, chiefly from the lias quarries of Street., and 
thus named by Mr. Owen in honour of the author of the work in which 
most of the specimens are figured and described which formed his splendid 
collections, now part ly deposited in this Gallery;—the species from Lyme 
Regis, first described by Mr. Convbeare, and named P. dolichodeirus, 
its neck being nearly equal in length to the body and tail united ;—the 
P. rugosus from the lias near Bel voir Castle, presented by H. G. the 
Duke of Rutland, being a unique nearly complete specimen of this 
species;—the specimen of a Plesiosaure, of which an account and figure 
have been given in the Philosophical Transactions for 1719, by Mr. 
Stukeley, who mistook it for a crocodile. 
In and on the Wail Cases of Room IV. are placed the larger speci¬ 
mens of the various species of Ichthyosaurus, or the fish-lizard, so de¬ 
nominated on account of their having in a recent state clearly presented 
