34 EXPLA1VATKW OF PLATE 23. 



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. (Cams. Comp. Anat. P. 

 370.) showing the elongated bones, or false ribs, 

 which support the membranous expansion of its Pa- 

 rachute. 



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 co- 

 temporary Libellula, and Cycadites. 



Plate 23. V. I. p. 180. 



Fig. 1'. Anterior extremity of the right jaw of Mega- 

 losaurus, from the Stonesfield slate, Oxon. (Buck- 

 land.) 



Fig. 2'. Outside view of the same, exhibiting near the 

 extremity, large perforations of the bone for the pas- 

 sage 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 thick- 

 ness of the largest tooth (a.) and its root set deep 

 and firmly in the bony socket, which descends 



