18 ON THE RED CHALK OP ENGLAND. 



sideration have the same thickness of the calcareous tube. The former occurs 

 only at Speeton and the latter at Hunstanton ; in order to distinguish the two, 

 the title " irregularis " may be applied to the latter as a variety. 



Serpula triserrata, a species found on a specimen of Ammonites complanatus, is 

 distinguishable by its three serrate longitudinal ridges. A similar form occurs on 

 ostrese from the Kimmeridge clay of West Norfolk. 



Terebratula semiglobosa is common at Speeton, but very rare at Hunstanton. 

 T. biplicata is very common at Hunstanton, but is not known at Speeton. 



Inoceramus Igevmsculus, Bean, a large smooth species something like I. Cuvieri. 



The Ammonites alternatus of Woodward is now lost ; it was probably a variety 

 of A. serratus, Park. 



Belemnites minimus is sometimes two inches long in the Hunstanton Cliff!, 



The vertebra of Polyptychodon would be, if perfect, about six inches in diameter 

 and three in thickness. 



The small specimen shown in Plate II. fig. 9 evidently belongs to the Turbino- 

 lian family of corals, and possibly to the genus Trochocyathus instituted by Messrs. 

 Milne-Edwards and J. Haime, in 1848. The specimens as yet obtained are not 

 sufficiently numerous nor perfect for a rigid comparison with other forms, or to 

 admit of a sufficiently detailed description should the species prove to be new. 

 The constricted form of growth is very common in the Parasmilia of the Upper 

 Chalk, and has no specific value. 



The characteristic fossils of the Red Chalk at Speeton are Terebratula semiglo- 

 bosa, Belemnites minimus, and Vermicularia elongata ; and at Hunstanton, Tere- 

 bratula biplicata, Belemnites minimus, and Spongia paradoxica. 



In conclusion, I have endeavoured all along to confine myself to 

 facts, and to abstain from theories, because I think the Geologists' 

 Association ought rather to follow in the steps of learned men than to 

 wish to take the lead. I am sure by doing so we shall gain respect. 

 If the strictly scientific workers see we wish to acquire information, 

 rather than to purchase an empty name, they will hold out the right 

 hand of fellowship and help us mightily ; whilst, on the contrary, if 

 they perceive we aspire too much, and attempt to grasp what we 

 cannot hold, then well-merited ridicule will undoubtedly be ours. The 

 Geologists' Association was only formed to bring amateurs together, to 

 give them a place to meet in, and a room where they could speak on 

 kindred subjects. I trust the members will always use the oppor- 

 tunity, and not be afraid to speak, ever remembering that each one 

 has some little knowledge which his neighbour has not, and that 

 when each helps his fellow, much must be the gain at last. 



