1200 



CLASS REPTILIA. 



from their fine structure, have preserved not only the smallest bones, 

 but not unfrequently also the impression of the membranous pata- 

 gium. All the forms which can be certainly referred to this family 

 are of small or moderate size. In Ptenodraco, of the lithographic 

 limestones, we have a small Pterodactyle not larger than a sparrow, 

 with a skull of very much the same contour as that of the latter, in 



Fig. 1097. — Nearly entire skeleton of Pterodactyjus sfiectabilis ; from the Kimeridgian of 

 Bavaria. The ventral aspect is shown ; and on the right side the ilium, and on the left the pubis 

 (<z) is exposed. 



which the teeth are confined to the extremities of the jaws, and the 

 nares do not appear to be separated from the preorbital vacuities. 

 Pterodactylus itself (of which Oi'nithocephalus^ and Diopecephalus 



1 It has been proposed to take the name Ornithocephalns in place of Pteno- 

 draco, a suggestion which is entirely opposed to all the rules of nomenclature. 

 The first use of the former name in this sense was made by Fitzinger in 

 1826. 



