A HISTORY OF KENT 



described from the Swiss Cretaceous, is represented both in the Gault of 

 Folkestone and the Lower Greensand of Maidstone. In the alHed genus 

 Edaphodon we have E. sedgwicki, typically from the Lower Greensand of 

 the Isle of Wight, in the Folkestone Gault, and perhaps also in the 

 Chalk-marl of Dover ; while a second species, E. laminosus, is typically 

 from Folkestone. 



In a very different group of fishes the pycnodont ganoids are 

 represented by Ccelodus ellipticus, a large species known only by a single 

 specimen of the dentition from Folkestone preserved in the collection of 

 the British Museum. 



In the herring group the genus and species of Elopidce known as 

 Thrissopater salmoneus were described on the evidence of Folkestone 

 specimens. In another family Portheus gaultinus, already referred to, is 

 typically from Folkestone ; and the same is the case with Ichthyodectes 

 serridens, of which only the type specimen appears to be known. 



The remains of both reptiles and fishes appear to be comparatively 

 rare in the Lower Greensand of the county, although special interest 

 attaches to some of the former. Most interesting of all perhaps is a 

 large slab of sandstone from the Kentish Rag (Hythe beds of the Lower 

 Greensand) from near Maidstone, preserved in the British Museum, and 

 containing a considerable portion of the skeleton of the great herbivo- 

 rous, bipedal, terrestrial dinosaurian reptile Iguanodon mantelli. This fine 

 specimen, obtained in 1834 by Mr. W. H. Bensted, is generally 

 regarded as the type of the species, which is itself the type of the 

 genus. The name Iguanodon was however given by Mantell on the 

 evidence of teeth from the Wealden of Sussex, and refers to a supposed 

 resemblance existing between these teeth and those of the South Ameri- 

 can lizards known as iguanas. A cast of the complete skeleton of a 

 larger species of Iguanodon, from Belgium, is exhibited in the Natural 

 History Museum. 



A dinosaur known only by a series of broken bones of the limbs 

 and pelvis from Lower Greensand of Hythe has been described under 

 the name of Dinodocus mackesoni, and is the sole representative of its 

 genus. It may be allied to the Jurassic Cardiodon {Cetiosaurus). The 

 large marine saurian known as Polyptychodon continuus, to which reference 

 has been made in an earlier portion of this article, is typically from the 

 Lower Greensand of Hythe and Maidstone. Another reptile from the 

 latter locality is one of the long-necked plesiosaurians, named Cimolio- 

 saurus latispinus. Fragments of the skull of a chelonian reptile from the 

 Lower Greensand of Maidstone have been made the types of a genus 

 and species under the name of Protemys serrata ; but their affinity is 

 uncertain, and they appear to have been lost. 



In addition to Ischyodus thurmanni, already referred to, the fishes of 

 the Lower Greensand of the county are represented by two sharks, 

 Synechodus tenuis from Maidstone, and a species from near Folkestone, 

 which may be identical with the Swiss Odontaspis studeri. The former 

 species is at present peculiar to Kent. 



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