226 COMPARISON OF MUNDESLEY chap. xii. 



When I showed the scales and teeth of the pike, perch, 

 roach, and salmon, which I obtained from this formation, to 

 Mr. Agassiz, he thought they varied so much from their 

 nearest living rej^resentatives that they might rank as dis- 

 tinct species ; but Mr. Yai'rell doubted the propriety of so 

 distinguishing them. The insects, like the shells and plants, 

 are identical, so far as they are known, with living British 

 species. ISTo progress has yet been made at Mundesley in 

 discovering the contemporary mammalia. 



By referring to the description and section of the fresh- 

 water deposit at p. 168, the reader will at once perceive the 

 striking analogy of the Mundesley and Hoxne deposits, the 

 latter so productive of flint implements of the Amiens type. 

 Both of them, like the Bedford gravel with flint tools and the 

 bones of extinct mammalia (noticed at p. 164), are post-glacial. 

 It will also be seen that a long series of events, accompanied 

 by changes in physical geography, intervened between the 

 "forest bed," !No. 3, fig. 27, p. 213, when the Elcphas meridi- 

 onalis flouinshed, and the period of the Mundesley fluviatile 

 beds A, B, c; just as in France I have shown, p. 199, that the 

 same E. meridionalis belonged to a sj^stem of drainage differ- 

 ent from and anterior to that with which the flint imple- 

 ments of the old alluvium of the Somme and the Seine were 

 connected. 



Before the growth of the ancient forest, No. 3, fig. 33, the 

 Mastodon arvernensis, a large proboscidian, characteristic of 

 the Norwich crag, appears to have died out, or to have become 

 scarce, as no remains of it have yet been found in the Norfolk 

 cliffs. There was, no doubt, time for other modifications in 

 the mammalian fauna between the era of the marine beds, 

 No. 2, p. 213 (the shells of which imply permanent sub- 

 mergence beneath the sea), and the accumulation of the up- 

 permost of the fluvio-marine and lignite beds, No. 3', which 

 overlie both Nos. 3, and 2, or the buried forest and the crag. 



