FOSSIL REPTILES OF DORSET. 3-'3 



appear to have been covered with horn, and the eyes of some 

 had sclerotic plates, ; the sternum had a crested ridge down its 

 centre. The scapula and coracoids resemble those of some birds. 

 The long bones, vertebrae, and some parts of the skull have air- 

 cavities. There is little doubt that the genus had the power of 

 sustained flight. 



PTERODACTYLUS MARDERI, Owen. 



This species is determined by Sir R. Owen from the proximal 

 portion of the right humerus, which shews the articular surface. 

 From the Lower Lias of Lyme Regis, and named from the 

 well-known collector of Fossil Reptiles residing at Lyme. 

 PTERODACTYLUS PLEYDELLII, Owen. 



Determined by Sir R. Owen from the distal portion of the left 

 humerus and proximal end of a phalange of the wing-finger. 

 From the Kimmeridge Clay, Kimmeridge. 



PTERODACTYLUS MANSELII, Owen. 



From the same bed and locality as the preceding, comprising the 

 proximal portion of the left humerus, including the head or 

 articular surface, also the proximal end of proximal phalanx of the 

 wing-finger. The above fragments of both species I presented to 

 the British Museum. 



Pterodactylus incert. sp. 



Including the carpal bones of two species and the phalanx of the 

 wing-finger of one, determined by Sir R. Owen. From the 

 Kimmeridge Clay, Weymouth. 



ORDER DEINOSAURIA, Owen. 



The Deinosauria comprise a group of extinct forms, which are, 

 in some respects, intermediate in structure between the Cursorial 

 birds and the typical reptiles. They are, for the most part, of 

 gigantic size, attaining, in some species, a length of upwards of 

 forty feet. Unlike other reptiles, the sacrum consists of from four 

 to six vertebrae, as with Aves and Mammalia. The ilia are pro- 

 longed forwards in front ofthe acetabulum (the cup which receives 

 the head of the thigh bone), as withbirds, and in a backward 



