80 On Fossils found at Foxton Hall, by G. A. Lebour, 



Hesb. Special interest, therefore, attaches to authentic collections 

 from this zone. 



Harlow Hill, on the line of the Eoman Wall, near the Whittle- 

 dean Eeservoir, is the best known locality for Filltop Limestone 

 fossils, but they are even more numerous in the shale of Eoxton 

 Hall. Comparing collections from both localities, one is chiefly 

 struck by the presence in each, of abundant specimens of Produc- 

 tus latissimus, a form which is by no means of common occurrence 

 elsewhere. The beautiful corals belonging to the genus Lithos- 

 trotion, which are so common at Harlow Hill, seem to be entirely 

 absent at Alnmouth, a fact which must probably be referred to 

 the less calcareous nature of the sea bottom at the last named 

 place. On the other hand one of the Trilobites and most of the 

 Crinoids found at Foxton Hall, have not yet been recorded from 

 the Felltop Limestone proper. In the following list the species 

 known to occur at Harlow Hill are marked thus "H. H." : — 



1. CUsioph^Uum hiparfitum, M-cGoj. Not rare. H.H. 



2. CI sp., a long vermiform species. Common. 



3. Choetetes tumidus, Phill. Not uncommon. 



4. Gri-ffithides sp. Eare. H.H. 



5. Gr. Farnensis, Tate. Eare. Sometimes in clay ironstone 



nodules. 



6. Poteriocrinus nuciformis, McCoy. Not rare. I have found 



several perfect calyces of this small crinoid. The late Mr 

 G-. Tate, F.G.S., referred the form to P. nuciformis of McCoy, 

 but my friend, Mr W. Percy Sladen, F.L.S., who has made 

 the group the study of his life, doubts whether it belongs to 

 the genus Poteriocrinus. He has, however, not yet decided 

 the question, and in the meantime, I have placed my speci- 

 mens in his hands for determination. 



7. Crinoidal Plates of a larger form than is usual, are not rare. 



These are also awaiting Mr Sladen' s determination. 



8. Crinoidal Stems, some very large, attaining an inch in diameter 



occasionally, and ranging from that to the smallest size are 

 very common. They occur in little local groups, probably 

 occupying much the same spots which they inhabited during 

 life. Some of these, undoubtedly belong to the genus 

 Poteriocrinus, but it is not possible, at present, more 

 accurately to name them. 



