468 Mr. Wetlierell on the Fossils of the London Clay. 



In the year 1829 I met with (on breaking some masses of 

 septarium, which I had brought from Child's Hill, north-west 

 of Hampstead,) the remains of a species of Ophiura in a very 

 good state of preservation ; and as the remains of Ophiura 

 had never before been noticed as occurring in the London 

 clay, I considered the discovery of sufficient importance to 

 make it the subject of a communication read before the Geo- 

 logical Society on January the 9th, 1833*. I have since seen 

 a fine specimen from Harwich, which is in the cabinet of 

 Edward Charlesworth, Esq. ; there is likewise one in the col- 

 lection of J. S. Bowerbank, Esq., recently obtained from the 

 Isle of Sheppey. 



The following list may be useful, as it contains a few more 

 of the organic remains (from the railroad): I have also added 

 some other localities. 



Crustacea. 

 Cancer Leachii. Highgate Archway and Isle of Sheppey. 

 Astacus\. Do., Isle of Sheppey, and Hampstead well. 



Radiaria. 



Pentagonasta. Hampstead well and Isle of Sheppey. 

 Pentaci-initesX stibbasaltiformis. Hampstead well, Mr. War- 

 ner's well at Hornsey, and the cliffs between Heme Bay, 

 and Whitstable. 



Zoophyta. 

 Turhinolia. Sheppey. 



Reptilia. 

 Trionyx^. Sheppey and Harwich. 



In the above pages, I have as much as possible avoided 

 technicalities, wishing to give a plain statement of those facts 

 which have come more immediately under my own observa- 

 tion ; and as other collections have been made from this rich 



» Proceedings of the Geological Society of London, vol. i. p. 4 15. 



•j- Two species, one of which appears to be the same as Astacus cata- 

 clysmi in the British Museum, the locality of which is not marked. 



X The London clay portion of the cliffs between Heme Bay and Whit- 

 stable belongs to the lower division of the stratum. About three years 

 since I brought away several dozen of stems of Pentacrinites, which are 

 very common there. At the railroad the Pentacrinite is extremely rare. 

 The remains I possess from there, consist of some stems, parts of the auxi- 

 liary side arms, tentacula, and a few bones of the pelvis. 



§ A splendid fossil Turde found in die Harwich cement-stone is in the 

 British Museum. It is from the collection of Edward Charlesworth, Esq., 

 and a very excellent and correct engraving of it has been made by Stan- 

 didse and Lemon of Cornhill. 



