182 mr. c. Thompson on the [June 1913, 



KlMERIDGIAN AMMONITES. 



* Amceboceras lineatum (Quensfc.). | ~*Virgatosphmctes ardesicus (Font.). 



*Perisphinctes lacertosus Dum. & | *Hoplites eudoxus ? (d'Orb.). 



Font, I *H. pseudornutabilis (de Loriol). 



*P. (?) quenstedti Rouillier. : Physodoceras lallierianum (d'Orb.). 

 *P. (?) stschurovskii Michalski. 



KlMEEIDGIAN BELEMNITES. 



Belemnites absolutus Pavl. j Belemnites puzosi d'Orb. 



B. obeliscoides Payl. 



Speeton-Clay Ammonites. 



* Craspedites fragilis (Traut.). 1 Hopliies cf. euthymi (Pict.). 



PolypiycMtes beani Payl. j H. regalis (Bean). 



P. bidichotomus (Leym.). [ H. oxygonius Neum. & Uhl 



P. gravesiformis Pari. 

 *P. keyserlingi (Neum. & "Uhl.). 



P. lamplughi Pavl. 



Hoplites amblygonius Neum. & Uhl 

 *H. cf. amblygonius IMeum. & "Uhl. 



SimbirsJcitcs concinnus (Phil.). 

 S. speetonensis (Y. & B.). 

 S. aff. discofalcatus (Lahus). 

 Neoeomites aff. deshaycsi (Leym.). 



Speeton-Clay Belemnites. 



Belemnites explanatus Phil. j Belemnites jaculum Phil. 



B. lateralis Phil. j B. brunsvicen&is Stromb. 



B. subquadratus Rcem. 



Chalk Belemnites. 



Belemnites altenuatus Sow. 

 B. minimus List. 

 B. ultimus d'Orb. 



Actinocamax qxiadratus Blainv. 

 Belemnitella lanceolate, (?) Schloth. 

 B. mucronata Schloth. 



Discussion. 



Mr. G. Barrow drew attention to the well-known evidence, at 

 Blea Wyke (Bobin Hood's Bay), of a sudden deepening of the water 

 at the time when the highest beds of tbe Lias and the lowest of the 

 Oolites were deposited. If this continued eastwards, it would 

 naturally explain why the matrix of some of the fossils exhibited 

 by the Author differed from that seen on the coast at Bobin Hood's 

 Bay. Farther north, the Liassic material brought inland in the 

 •Glacial deposits did not appreciably differ from that met with in situ. 



Mr. G. W. Lamplegh congratulated the Author on having 

 vindicated the aspersed reputation of the transported fossils of 

 the Drift, which had suffered unduly from unscrupulous usage by a 

 few of the early collectors. These fossils were of particular value 

 when, as in the present case, they carried an indication of the 

 stratigraphy of the inaccessible sea-bottom. In Holderness the ice 

 had served as a dredge working landward, and its tip-heaps were 

 left ready for inspection in the sea-cliffs. The results achieved by 

 the Author from his study of the derived cephalopoda alone showed 

 how much we might learn respecting the seaward prolongation of 



