PTEROSAURIA 247 



teeth to their extremities ; all the teeth are lung, slender' 

 sharp-pointed, set well apart. The tail is very short. 



P. longirostris, Ok. — About 10 inches in length ; from 

 lithographic slate at Pappenheim. P. crassirostris, Goldf. — 

 About 1 foot long ; same locality (fig. 74). P. Kochii, Wagn. 

 — 8 inches long ; from the lithographic slates of Kehlheim. 

 P. medius, Mnst. — 10 inches long; from the lithographic 

 slates at Meulenhard. P. grandis, Cuv. — 14 inches long ; 

 from lithographic slates of Solenhofen. Two small and 

 probably immature Pterodactyles, showing the short jaws 

 characteristic of such immaturity, have been entered as species 

 under the names of P. Irevirostris and P. Mcycri, The latter 

 shows the circle of sclerotic eye-plates. 



The fragmentary remains of Pterodactyle from British 

 oolite — e.g., Stonesfield slate, usually entered as Ptcrodactylus 

 BiLcklandi — indicate a species about the size of a raven. 



The evidences of Pterodactyles from the Wealden strata 

 indicate species about 16 inches in length of body. Those 

 (P. Fittoni and P. Sedgwickii, Ow.) from the greensand forma- 

 tion, near Cambridge, with neck-vertebrse 2 inches long, and 

 humeri measuring 3 inches across the proximal joint, had a 

 probable expanse of wing of from 18 to 20 feet. The P. 

 Cuvieri, Ow., and P. compressirostris, Ow., from the chalk of 

 Kent, attained dimensions very little inferior to those of the 

 greensand Pterodactyles. 



More evidence is yet needed for the establishment of the 

 pterosaurian genus, on the alleged character of but two 

 phalanges in the wing-finger, and for which the term " Orni- 

 thopterus" has been proposed by Von Meyer. 



With regard to the range of this remarkable order of flying 

 reptiles in geological time, the present evidence is as follows : 

 The oldest well-known Pterodactyle is the Dimorphodon macro- 

 nyx, of the lower lias ; but bones of Pterodactyle have been 

 discovered in the coeval lias of \Yirtemherg. The next in point 



