Vol. 69.] DERIVED CEPHALOPODA OF THE HOLDERNESS DRIFT. 177 



General Note on the Liassic Fossils. 



In regard to the general facies and the matrices of the specimens 

 from all the zones above that of Oscynoticeras oseynptus, I am hound 

 to state that they exactly represent what is known to-day of their 

 exposures along the north-eastern coast of Yorkshire. Therefore, 

 they were in all probability swept into Holderness from points not 

 very far distant from the localities where they are obtained in situ 

 to-day. 



But, as already stated, the material representing some of the 

 lowest zones differs from that of any known exposure on land, and 

 probably indicates localized types of deposit now concealed by the 

 North Sea. 



III. Oolitic axd Kimeridgian Cephalopoda from the Drift. 



Of the Oolitic cephalopoda, I have but a poor account to give. I 

 have so far seen only two specimens from beds below the Oxfordian, 

 and I did not myself find these. They are two examples of 

 Macrocephalites macrocephalus ( ? ) , probably from the Cornbrash. 

 No Kellaways specimen has rewarded this search, although that 

 rock is so abundantly supplied with species of ammonites in land- 

 exposures. The scantiness of Oolitic material in the Holderness 

 Drifts has been mentioned by previous workers on the boulders 

 generally, and is thus confirmed. 1 



The Oxford Clay is better represented, and many specimens of 

 Quenstedtoeeras lamberti (Sow r .) have been obtained by the various 

 collectors. The appended list (p. 181) shows five species for the 

 Oxfordian, one of which is new. These are all pyritic, and were 

 found quite free from matrix. The Kimeridgian is represented by 

 much shale with compressed ammonites, which Mr. Buckman has 

 attempted to determine for us. The result is seen in the list given 

 here (p. 182) : it will be noticed that most are new records. 



Now and then a large piece of a belemnite from the Upper 

 Kimeridgian is found, and one is able to identify it. One large 

 fragment with a deep ventral groove was referred to Mr. G. C. Crick. 

 He has written that it comes nearest to Belemnites volgensis d'Orb., 

 which Prof. A. P. Pavlow regards as a synonvm for B. absolutus 

 Fisch. 



IV. Lower Cretaceous Cephalopoda. 



Arriving at the Speeton Clays, I am able to say that the yield 

 has been fairly abundant. There are occasionally exposed on the 

 foreshore in Holderness large, masses of transported clay, which 

 have been shifted bodily with no damage to the contained fossils. 

 In fact, one may actually find more perfect specimens in them 

 than can be usually obtained at Speeton itself. 



The list given here is comparatively long, even though I have 

 not been able to in elude in it the large globular ammonites of which 



1 See G-. W. Lamplugh, ' On the Larger Boulders of Flambornugh Head, &c.' 

 Proc. Yorks. Geol. Soc. vol. xi, pt. 2 (1889) Tunstall, p. 234 ; & ibid. pt. 3 

 (1890) Hornsea, p. 400. 



