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fossil Chelonians, or Turtles and Tortoises, from the Tertiary deposits at Sheppey, Harwich, &c.; and some interesting detached bones and plates of Turtles from the Wealden of Tilgate Forest, especially of Tretosternum Bakewelli, (formerly in the Author's collection.).

Below there are two specimens of a small Crocodilian reptile the Geosaurus, from Solenhofen.

On the left of the above are casts of three species of Pterodactyles, or Flying Reptiles, from Solenhofen, viz.-P. longirostris, P. brevirostris, P. Munsteri.

In a small frame is the unique specimen of Pterodactyle, (P. macronyx) from the Lias of Lyme Regis; discovered by Miss Mary Anning, and described by Dr. Buckland in "Geolog. Trans." Vol. III. Pl. XXVII. p. 220.

B. [2.]-On the upper shelf are a beautiful head, with part of the vertebral column of Macrospondylus, and below a fine cranium of Crocodilus toliapicus from the Isle of Sheppey; and a portion of skull, with the jaws and teeth perfect, of a large Teleosaurus.

To the right of the Teleosaurus is the cranium of Crocodilus Spenceri, from the Isle of Sheppey, (figured in Dr. Buckland's "Bridgewater Treatise," Pl. XXV.)

On the shelf below, (immediately above the Hylæosaurus,) is a very fine example of Teleosaurus priscus, or Aelodon, from Monheim. On the right of the Hylaosaurus are specimens of Teleosaurus Chapmanni, and remains of other extinct crocodilian reptiles.

Mosasaurus or Fossil Reptile of Maestricht.—In the lower division of Case B, near the angle, is a model of the celebrated specimen of the Mosasaurus Hoffmanni, now in the Jardin des Plantes. (Presented to the Author by Baron Cuvier.) Above it are two fine portions of the jaws with teeth, of the same species of gigantic reptile, presented in 1784 by Dr. Peter Camper. On the frame of the Geosaurus are some detached vertebræ of Mosasaurus from Maestricht; and a small slab of chalk in which are imbedded two caudal vertebræ and a detached dorsal vertebra of a species of Mosasaurus, (M. stenodon,) from the chalk near Lewes. (Figured in "Fossils of the South Downs." 1822.)

Hylaosaurus.-In the lowest department in the centre of Case B, is the first discovered specimen of Hylæosaurus,

(figured in the "Geology of the South-East of England," Pl. V.); above it is a remarkably interesting portion of the vertebral column, with many dermal bones of another Hyloosaurus, (figured in "Phil. Trans." for 1849, Pl. XXXII.).

By the side of the first specimen, to the left of the spectator, are a very large scapula, and other bones; and on the right, the proximal end of the corresponding scapula, and the humerus, with many portions of ribs, and a phalangeal bone, belonging to the same individual; from a bed of Wealden Clay, near Bolney, in Tilgate Forest.

On the right hand is a model of a nearly perfect dorsal dermal spine of the Hylaosaurus, (the original, fourteen inches long, discovered by Mr. Peter Fuller, of Lewes, is in the possession of the Author,) figured in "Phil. Trans." 1850, Pl. XXVII.

C. [3.] Iguanodon.-The contents of this Case are chiefly bones and teeth of reptiles of the genus Iguanodon, from the strata of Tilgate Forest, in Sussex, discovered and developed by the Author.

Upper Shelf.-On the left a very fine Coracoid bone imbedded in Tilgate grit; and a portion of another Coracoid.

A scapula, eighteen inches long, of an unknown reptile; (figured and described in "Phil Trans." 1841, Pl. IX. X.). Portions of a very large Scapula, probably of Pelorosaurus; (figured in "Fossils of Tilgate Forest," Pl. XVI.).

Fragment of the shaft of a Femur twenty-three inches in circumference. (Marked No. 4.) See "Fossils of Tilgate Forest," Pl. XVIII.; this was the first portion of a colossal bone discovered by the Author in the Wealden of Sussex, in 1820.

Two pieces of a femur, tibia, fibula, and two metatarsal bones, of the same young and comparatively small Iguanodon. Bone in a block of Tilgate grit ; undetermined.

Fragment of a very large Os pubis, probably of the Iguanodon.

Near this specimen there is a bone supposed to be part of the Ischium, but it is imperfect at the extremities, and the form of the original cannot be ascertained with certainty. There are portions of several other bones on this shelf that cannot be satisfactorily interpreted till more perfect specimens are discovered.

Second Shelf from the Top.-On the left, two small cylindrical bones, possibly of the anterior extremity of a young Iguanodon. Tibia and fibula, (marked No. 2) of the same individual as the femur on the right hand, (labelled No. 5.) These three specimens give the relative proportions of the thigh and leg of this species of Iguanodon.

A very fine femur (marked No. 3); and the largest and most perfect in the collection, (marked No. 1,) which is fortyfour inches long, and twenty-two inches round the shaft ; this specimen was dug up from the Weald Clay near Loxwood, in Sussex, and presented to the Author by the late Earl of Egremont.

Sacral vertebra.-On the trays containing these magnificent thigh bones, there are placed four specimens of sacral vertebræ, which are highly interesting. The right hand vertebræ are a portion of the sacrum of the Megalosaurus; the generic relations of the next specimen, (which is figured in "Philos. Trans." for 1841, Pl. IX. fig. 5,) is not ascertained: the single sacral vertebra on the left belongs to the Iguanodon; the fourth specimen is part of the sacrum ascribed, with much probability, to the Hylaosaurus. "Brit. Assoc. Report," p. 114.

Narrow Shelf.-Numerous teeth, comprising upper and lower molars of Iguanodon, of various ages, and in different stages of detrition.

Polished transverse sections of the tibia of a young Iguanodon.

Portion of the anterior part of the upper jaw of the Iguanodon; (figured and described in "Phil. Trans." 1848, Pl. IX.)

Horn, or dermal tubercle, (figured in "Fossils of Tilgate Forest," Pl. XX. fig. 2,) probably of the Iguanodon.

Portion of the lower jaw of a reptile, Regnosaurus Northamptoni, (figured and described in "Phil. Trans." 1841, Pl. V. and 1848,) from Tilgate Forest.

Lower Division.-Numerous ribs, vertebræ, and chevronbones, and bones of the extremities; namely, metatarsals or metacarpals, phalangeals, and ungueals.

A slab of Tilgate grit with six anterior caudal vertebræ, and three chevron-bones of an Iguanodon; a matchless specimen.

Below this fossil are several ribs, and a portion of a remarkably fine rib, thirty-six inches long.

A perfect Clavicle, (figured in "Geology of the South-East of England," Pl. IV.), and portions of others.

There are chevron bones, and many detached vertebræ on the shelf to the left of the central specimen; chiefly caudal of the Iguanodon: but there are a few belonging to other genera, as Megalosaurus, Poikilopleuron (?), Goniopholis, &c. Tympanic bones.—On the right hand is one very large and fine specimen, (figured in "Geology S. E. of England,” Pl. XI. fig. 5.).

Humerus.-A model; the original is in the possession of Mr. Fowlestone, of Ryde, Isle of Wight. It afforded the data by which I was enabled to determine the character of this part of the skeleton of the Iguanodon.

In the same compartment there are casts of a metatarsal or metacarpal, and two phalangeal bones of Iguanodon, from the Wealden of Sussex, presented by S. H. Beckles, Esq. of Hastings.

Pelorosaurus.-The four splendid plano-concave vertebræ placed together, with a chevron bone hanging near them, do not belong to the Iguanodon, but are referred, provisionally, to a colossal reptile of the Crocodilian type, named by the Author Pelorosaurus Conybeari; (figured and described in "Phil. Trans." 1850, Pl. XXII.) They are the Cetiosaurus brevis, of "Brit. Assoc. Report," 1841. Some of the other large vertebræ of this type probably belong to the same genus, and other biconcave vertebræ to the genus Cetio

saurus.

There are two imperfect convexo-concave cervical vertebræ, which have been referred to a species of Streptospondylus, (see "Brit. Foss. Rept." p. 92), but probably belong to the Iguanodon or Megalosaurus.

Megalosaurus.-There are femora, phalangeal bones, and many teeth of this Reptile, from the Wealden of Tilgate Forest; and portions, (three anchylosed vertebræ,) of the sacrum, from the Oolite of Stonesfield.

There is also the cast of a metatarsal or metacarpal bone of the Megalosaurus, from the original in Dr. Buckland's possession, and which was given me by that eminent palæontologist : it serves to illustrate the homologous bone in the Iguanodon.

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