580 ME. T. MELLARD READE ON POST-GLACIAL BEDS [A-Ug. 1 898, 



such as occur in the Chalk, which simulate broken spicules, and 

 minute broken spines of echinoderms looking very fresh.' 

 Mr. Wright reports upon this clay as follows : — 



Scrohicularia ^lan a-clay. 



Weight, 8'7 oz. troy. After washing, 3'1 oz. fine, coarse none. Foraminifera 

 abundant. 



List of Foeaminifera. 



* Trochammina ivflata (Mont.). Very common. 



* Textularia globulcsa, Ebr. Frequent. 

 Bulimina piipoides, d'Orb. Verj rare. 



* „ elegantissima, d'Orb. Rare. 



* Bolivina punctata, d'Orb. Rare. 



„ plicata, d'Orb. Very rare. 



,, obsoleta, Eley. Yery rare. 



Cassididhia crassa, d'Orb. Very rare. 



* Lagena glohosa (Mont.). Rare. 



* ,, Icevis (Mont.). Frequent. 



* „ clavata (d'Orb.). Frequent. 



* ,, S2i!cata (W. & J.). Very rare. 



„ Williamso'di (Alcock). Frequent. 



* ,, squamosa (Mont.). Rare. 



* ,, IcBvigata (Reuss). Frequent. 



., Orbignyana (Seg; ). Very rare. 



* Nodosaria coiiinuoiis, d'Orb. Very rare. 



* Cristellaria aciitauricularis (F. & M.). Very rare; large specimen. 



* Poli/morphhia lactea (W. & J.). Frequent. 



,, lanceolata, Reuss. Rare. 



* Uvigerina aspcrula, Cz. Very rare. 



* „ angulosn, Will. Rare. 



Glohigerina hulloides, d'Orb. One very small specimen. 

 Orhulina universa, d'Orb. Rare ; specimens very small. 

 Dlscorbina Wrightii, Br. Common. 



* Trv.ncafulina lobatula (W. k J.). Rare. 



* Pulvimdlna Micheliniana (d'Orb.). Very rare. 



* Botalia Beccarii (Linn.). Very common. 



* Konio7iina depres&ula (W. & J.). Extremely abundant. 



,, scapha (F. & M). Very rare ; large specimens. 

 ,, Boveana, d'Orb. Very rare. 

 "^ Polyatomella striato -punctata (F. & M.). Extremely abundant. 



NoJiionina deprcssula and Polysfomella striaio -punctata occurred in the 

 greatest profusion ; it was estimated that about 17,000 specimens of the former 

 and about 80CO of the latter occurred in ihis gathering, ^hile tho other 

 30 species included in all only 250 specimens. Tiie iloatings from which these 

 results were obtained weighed only '1^ grains. 



The following diatoms were also plentiful in the clay, namely : — TriceratiuTn 

 faius, Eupodiscus Argus, and ActinoptycJius sjAthdcas. 



All the species of foraminifera, with the exception of Cristellaria acufauri- 

 cularis, Uvigerina aspiruta, and Bolivina obsoleta, have been found off the 

 British coast. 



Physiography of the Deposits, and Comparison with the 

 Post-Glacial Beds of Lancashire and Cheshire. 



Prom the regular sequence, nature, and levels of these deposits it 

 would appear that they have been laid down upon a land-surface 

 which gradually subsided and was flooded by a shallow sea. 



The succession of the beds described in this paper shows that they 



