178 mr. c. Thompson on the [June 19 13,. 



Mr. Morfitt possesses so many -well-preserved examples. I have 

 absolutely failed to find these forms described in recent works, 

 although they closely approach Polyptychites globulosus of Prof. A., 

 von Kcenen's new work on the Valanginian Polyptycliites} They 

 are evidently representative of the Valanginian fauna. The mode 

 of preservation of the majority in large nodules of hard clayey 

 limestone differentiates them from anything that can be found 

 at present at Speeton. It is true that specimens akin to them are 

 preserved in the old collections of the museums ; but many of these 

 show evidence of having been rolled by the sea, and have been 

 obtained from the shore, even if they were found at Speeton. This 

 is no reflection on any museum, but it is perhaps a reflection on 

 some of the early collectors. 



The belemnites of the Speeton Clays are better preserved than 

 those of the Lias. At Hornsea it is comparatively easy to pick up 

 many good specimens of all the typical species. 



Y. Upper Cretaceous Cephalopoda. 



As yet no ammonites from the Chalk have been found, although, 

 as everyone knows, that rock is plentiful in the Yorkshire Drift. 



In consequence of the large amount of Red Chalk scattered in the 

 cliffs everywhere along this coast, its small belemnites have been 

 easily found. The abundant material has no doubt been derived 

 from the extension of the outcrop beneath the present bed of the 

 sea, as the small exposure at Speeton would be quite inadequate to 

 supply it. 



The belemnites of the uppermost zone of the English Chalk 

 abound, and everyone wdio walks along the Holderness shore very 

 soon finds Belemnitella mucronata. Besides these plentiful belem- 

 nites of the Upper Chalk, collectors obtain a large number of 

 Upper Chalk echinoderms not found in situ ; their place of origin 

 is unknown. 



These facts afford strong evidence of the former existence of the 

 uppermost zone of the Chalk in the Holderness district, although 

 nothing is present to-day above the Actinocamax-quadratus Zone. 



YI. Summary and Conclusions. 



(1) A large number of ammonites, particularly from the Lower 

 Lias, have been recovered from the Drift. These include many 

 new forms not given in any Yorkshire records hitherto published. 

 They fill up many gaps in the English list when that is compared 

 with the German lists given by Hyatt in Table I of his ' Genealogy 

 of the Arietidas in the Basin of South Germany.' 



(2) There are very few Liassic zones that have not yielded at 

 least one new form. 



(3) The matrices of the Lower Liassic fossils are mostly different 

 from those now exposed. 



1 ' Die ~Polyft i/chites-Arten des Unteren Valanginien ' Abhandl. K. Preuss. 

 Geol. Landesanst. n. s. pt. 59 (1909) pp. 19-20 & pi. iv, figs. 1-2. 



