ORGANIC REMAINS OF THE WEALD. 403 



condition, occasioned by the transporting action to which 

 they have been exposed. Species of the genera Lepidotus, 

 Pycnodus, and Hylodus are found. The fishes of the wealden 

 are specifically distinct from those of the chalk. 



FIG. 282. Sussex Marble, composed of Paludinse. 



TURTLES. The bones and other remains of turtles 

 referable to one marine, and two freshwater genera, the 

 Emys and ^Drionyx, have been exhumed from these deposits. 

 The teeth and bones of crocodiles of two species have been 

 discovered ; the one allied to the gavial, with long, slender 

 jaws ; the other more nearly resembling the common croco- 

 dile. At Swanage, a highly interesting specimen of Gonio- 

 pholis was obtained, which comprised the lower jaw, con- 

 taining two teeth in situ, with several other scattered teeth, 

 portions of the pelvis, ribs, and dermal plates. 



COLOSSAL REPTILES. The most important discovery 

 effected by Dr. Mantell in the region which he has raised to 



DI)2 



