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PLATE 20. V. I. p. 167.

Head of the Mosasaurus, or Great Animal of Maestricht. (Cuvier.)

PLATE 21. V. I. p. 171.

Pterodactylus longirostris in the lithographic slate of Aichstedt. (Cuvier and Goldfuss.)

In this Plate, and Plate 22, the same letters and figures designate the corresponding Bones in the different Animals to which they are affixed; they are copied chiefly from the figure and Explanations of Dr. Goldfuss, in his Beitrage zur Kenntniss verschiedener Reptilien der Vorwelt.

г. Cavitas narium.

A. Cavitas intermedia.

e. Orbita.

a. Maxilla superior.

b. Vel os nasi vel inter-maxillare?

c. Operculum nasale.

d. Aut os frontis anterius vel nasale?

e. Os frontis proprium.

f. Os parietale.

g. Os petrosum.

H. Pars basilaris ossis occipitis.

h. Pars lateralis.

i. Os tympanicum s. quadratum.

k. Os frontis posterius.

1. Os mastoideum.

m. Os zygomaticum.

n. Aut os lacrymale vel superciliare?

o. Annulus orbitalis.

P. Corpus ossis sphenoidei.

p. Processus transversus ossis sphenoidei.

q. Os pterygoideum.

r. Os transversum.

s. Os palatinum.

t. Processus palatinus maxillæ superioris. v. Pars angularis inferior maxillæ inferioris. w. Pars angularis superior.

x. Pars condyloidea.

y. Pars complementaria, Cuv. (coronalis, auctor.) z. Os hyoideum.

I. Atlas.

II. Epistropheus.

III-VII. Vertebræ colli.

VIII-XXII. Vertebræ dorsi.

XXIII. XXIV. Vertebræ lumborum.
XXV. XXVI. Os sacrum.

XXVII. Ossa coccygea.

XXVIII. Sternum.

1-15. Costæ.

16. Scapula.

17. Os coracoideum.

18. Ilium.

19. Os pubis.

20. Os ischium.

21. Humerus.

22. Ulna.

23. Radius.

24. Carpus.

25. Os metarcarpi primum s. pollicis.

26. O. m. secundum.

27. O. m. tertium.

28. O. m. quartum.

29. O. m. quintum. 30, 31. Phalanges. 32-34. Ph. indicis.

35-38. Ph. digiti medii.

39-43. Ph. digiti annularis.

44-47. Ph. digiti auricularis.

48. Femur.

49. Tibia.

50. Fibula.'

51. Tarsus.

52-56. Metatarsus.

57, 58. Phalanges digiti primi.

59-61. Ph. d. secundi.

62-65. Ph. d. tertii.

66-70. Ph. d. quarti.

71-74. Ph. d. quinti.

Impressions of the membrane of the wing.*

PLATE 22. V. I. p. 171.

A. Restoration of the Skeleton of Pterodactylus crassirostris. (Goldfuss.)

B. Fore foot of a Lizard. (Cuvier.)

C. Restoration of the right fore foot, or right hand of Pterodactylus crassirostris. (Goldfuss.)

D. The right fore foot, or hand of P. longirostris. (Cuvier and Soemmerring.)

E. The Fore foot of P. macronyx. (Buckland, Geol. Trans. Lond. 2d. Ser. Vol. 3. Pl. 27.)

F. The hind foot of a Lizard. (Cuvier, Oss. Foss. Vol. V. Pt. II. Pl. XVII.)

G. Right foot of P. crassirostris, as conjecturally restored

* Professor Agassiz considers that the Corrugations on the surface of the Stone (d), which Dr. Goldfuss supposed to be the impressions of Hairs, or Feathers, are only casts of the minute foldings of the contracted membrane of the wing. It is probable that Pterodactyles had a naked skin like the Ichthyosaurus; (See Pl. 10. A.) because the weight of scales would have encumbered their movements in the air.

by Dr. Goldfuss. No authority for this seems to be
afforded by the fossil specimen N.

H. Right foot P. longirostris. (Cuvier.)
I. Foot of P. macronyx. (Buckland.)
K. Hind foot of a Bat.

L. Skeleton of Draco volans. (Carus. Comp. Anat. P. 370.) showing the elongated bones, or false ribs, which support the membranous expansion of its Parachute.

M. Skeleton of a Bat. (Cheselden.)

N. Skeleton of P. crassirostris, in the Museum at Bonn, in Solenhofen slate. (Goldfuss.)

O. Skeleton of P. brevirostris, from near Aichstadt, in the same slate. (Goldfuss.)

P. Imaginary restoration of Pterodactyles, with a cotemporary Libellula, and Cycadites.

PLATE 23. V. I. p. 180.

Fig. 1. Anterior extremity of the right jaw of Megalosaurus, from the Stonesfield slate, Oxon. (Buckland.)

Fig. 2'. Outside view of the same, exhibiting near the extremity, large perforations of the bone for the passage of vessels. (Buckland.)

Fig. 1. Tooth of Megalosaurus, incomplete towards the root, and seen laterally as in Fig. 1. Nat. size. (Buckland.)

Fig. 2. Side view of a tooth nearly arrived at maturity. The dotted lines mark the compressed conical cavity, containing Pulp, within the Root of the growing tooth. Scale two thirds. (Buckland.)

Fig. 3. Tranverse section of Fig. 1'. showing the thickness of the largest tooth (a.) and its root set deep and firmly in the bony socket, which descends

nearly to the bottom of the Jaw. Scales two thirds. (Buckland.) Fig. 4. Transverse section of the tooth (Fig. 2.) showing the manner in which the back and sides are enlarged, and rounded in order to give strength, and the front brought to a strong and thin cutting edge at D'. (Buckland.)

PLATE 24. V. I. p. 184.

Fossil Teeth and bony nasal horn of Iguanodon; and lower Jaw and Teeth of Iguana. (Mantell and Original)

In Mr. Mantell's collection there is a perfect thigh bone of this animal, 3 feet 8 inches long, and 35 inches in circumference at its largest and lower extremity.

PLATE 25. V. I. p. 191.

Fig. 1. Fossil Crocodilean found at Saltwick near Whitby, eighteen feet long, and preserved in the Museum of that town. This figure is copied from Plate XVI. of Bird and Young's Geol. Survey of the Yorkshire coast. As this appears to be the same species with that engraved in the Phil. Trans. 1758, Vol. 50. Pt. 2. Tab. 22, and Tab. 30, and presented to the Royal Society by Captain Chapman, Mr. König has applied to it the name of Teleosaurus Chapmanni.

Fig. 2. Another head of Teleosaurus Chapmanni, also in the Museum at Whitby, and from the Lias of that neighbourhood. (Original.)

Fig. 3. Head of a third Individual of the same species from the same locality, placed in 1834, in the British Museum, showing the outside of the lower Jaw. (Young and Bird.)

Fig. 4. View of the inside of a lower Jaw of the same

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