EXPLANATION OF PLATE 22. 33 



39 — 43. Ph. digiti annularis. 



44 — 47. Ph. dio;iti auiicularis. 



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. 221. 



A. Restoration of the Skeleton of Pterodactylus cras- 



sirostris. (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. (Cu- 



vier 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. PI. XVII.) 



G. Right foot of P. crassirostris, as conjecturally re- 



* Professor Agassiz considers that the Corrugations on the surface 

 of the Stone (S), 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 PI. 10. A.) because 

 the weight of scales would have encumbered their movements in 

 the air. 



GEOL. II. D 



