Irish Naturalist, Vol. xiii.] 



[1'late 9. 



^ 



NAT. SIZE. R. Welch, Photo. 



Helix aspersa with reversed form of shell. 

 From dunes near Ardtermon Castle, Raghly. 





NAT. SIZE. 



K. \\ (.'Ich, Photo. 



Recent Sandstone, Strandhill dunes. 



Calcrete of shell-sand forming a sandstone, with contained landshells, 

 A, upper surface, B, under surface of a thin bed. 



To face p. 189.] 



