52 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [Dec. 4, 



Fig. 17. Neseuretus ramseyensis, section showing convexity of thorax. 

 18-26. , tails of several species. Ramsey Island and Tremanhire (collec- 

 tions of Messrs. Homfray, Lightbody, and Hicks). 

 27. Orthoceras, sp. Tremanhire (the author's collection). 

 28, 29. Theca Davidii, spec. nov. Ramsey Island (ditto). 

 30-32. Bellerophon ramseyensis, spec. nov. Ramsey Island and Tremanhire 

 (ditto). 

 33. solvensis, spec. nov. Tremanhire (ditto). 



Plate IV. 



Figs. 1-9. Niobe menapiensis, spec. nov. From Ramsey Island and Tremanhire 

 (collections of Messrs. Homfray, Lightbody, and Hicks). 



10-16. solvensis, spec. nov. Ditto (in the author's collection). 



17-20. Dendrocrinus cambriensis, spec. nov. Ramsey Island (in Messrs. 



Lightbody and Hicks's collections). 

 21-23. Palasterina ramseyensis, spec. nov. Ditto (in Mr. Lightbody's col- 

 lection). 



Plate V. 



Figs. 1-4. Glyptarca primceva, gen. et spec. nov. Ramsey Island (in the author's 

 collection). 



5. Lobleyi, spec. nov. Ditto (ditto). 



6, 7. Ctenodonta menapiensis, spec. nov. Ditto (ditto). 

 8, 9. cambriensis, spec. nov. Ditto (ditto). 



10. Palwarca oboloidea, spec. nov. Ditto (ditto). 



11. Hophinsoni, spec. nov. Ditto (in Mr. Hopkin son's collection). 



12. Bavidia ornata, gen. et spec. nov. Ditto (in the author's collection). 



13. ■ plana, spec. nov. Ditto (in Mr. Lightbody's collection). 



14. Modiolopsis ramseyensis, spec. nov. Ditto (the author's collection). 

 15. (?). Ditto (ditto). 



16, 17. Homfrayi, spec. nov. Ditto (collection of Messrs. Hopkinson 



and Hicks). 



18, 19. solvensis, spec. nov. Ditto (the author's collection). 



20. cambriensis, spec. nov. Ditto (ditto). 



Discussion. 



Mr. Loblet commented on the importance of the discovery of so 

 many well-marked species of Lamellibranchiata in beds of an earlier 

 date than those in which their presence had previously been known. 



Mr. H. Woodward agreed with the author in regarding tbe Neseu- 

 reti and Niobce described as presenting new forms. 



Mr. Hopkinson remarked on the similarity of the faunas of the 

 Tremadoc and Arenig rocks to those of the Potsdam and Quebec 

 rocks of America. With regard to the connexion between the 

 Arenig and Llandeilo beds, he mentioned that but one or two forms 

 of Graptolites passed from one to the other. It was, however, 

 between the Tremadoc and Arenig rocks, if anywhere, that there 

 appeared to be a distinct break in the series. 



2. On the Phosphatic Nodules of the Cretaceous Bock of Cambridge- 

 shire. By the Rev. O. Fisher, P.G.S. 



[Plate VI.] 



On the twenty-second of January 1868, during the discussion upon 

 Mr. Judd's paper on the Speeton Clay, I was much struck with an 



