Vol. 69.] DERIVED CEPHALOPODA OF THE HOLDERNESS DRIET. 179 



(•i) The fossiliferous boulders from the Middle and Upper Lias 

 ■exactly resemble the rocks now exposed in North-East Yorkshire. 



(5) Oolitic forms are very few in number, except those from the 

 Kimeridgian. 



(6) The Speeton Clays have yielded abundant excellent specimens, 

 -especially of the Valanginian types. 



(7) A much larger outcrop of Red Chalk is indicated than is at 

 present known. 



(8) The belemnites of the uppermost zone of the Upper Chalk 

 abound, although they are not found in place in Yorkshire. 



Hence one may conclude that : 



(a) There Avere outcrops of the Lower Lias in the track of the 

 ice, that is in the bed of the North Sea of that time, 

 which differed somewhat (both in petrological characters 

 and in the contained fossils) from those now exposed on 

 land. They were probably continuous with the German 

 Basin, for very many forms are common to both. This 

 connexion has been mentioned by various authors before ; 

 but I hope that this research has considerably strengthened 

 the evidence given by them. 



(/3) There were also outcrops of Chalk, higher in its zonal 

 position than any now known in Yorkshire. This 

 « latter conclusion has also been arrived at by others. 



(y) The evidence for the connexion of the English Speeton 

 Clays with the Continental deposits of the same age is 

 strengthened by the discoveries in the Drift. 



With regard to the identification of the specimens, it will be seen 

 that all the important ammonites on which my conclusions rest 

 have been identified by Mr. Buekman. On myself rests the full 

 responsibility for the remainder. 



My best thanks are due to so many, that I refrain from giving 

 the very long list of names. I must, however, especially thank 

 Mr. S. S. Buekman, E.G.S., without whose labours I could have 

 done little more than collect. 



All the collectors along these shores and the curators of the local 

 museums have been most generous in allowing full use of their 

 specimens. I am more especiallv indebted to Mr. William Morfitt, 

 of Atwick ; Mr. T. Sheppard, E.G.S. ; Mr. G. Sheppard, E.G.S. ; 

 Mr. F. Murley ; Mr. W. Ennis, B.Sc. ; and Mr. J. W. Stather, 

 F.G.S., all of Hull ; also to Mr. Miskin, of Hornsea. 



Mr. Lamplugh has kindly read through my paper, and has 

 suggested improvements, for which my sincere thanks are due. 



Also, I must express my most grateful acknowledgment to the 

 Royal Society for a generous grant towards my travelling expenses, 

 incurred in visiting many museums for the purpose of this paper. 



Finally, Mr. H. A. Denham, B.A., my colleague and never-failing 

 companion during very many trips to the coast, deserves a complete 

 and ample acknowledgment for his great share in the work of 

 collecting and in discussing the specimens named. 



