TIDAL 
débris. 
Salsola 
Kali, £. 
PuateE I. 
FIXED 
DUNES. 
EMBRYONIC 
DUNE, 
Fic. 1.—The coast between Berrow and Burnham, //elix aspersa, Miller, and 
H. nemoralis, L. are abundant on the embryonic dune. 
Fic. 2.—Shifting Dunes near Berrow, capped with Marram Grass ( dAmmophila 
arenaria, Link); a well-known haunt of Helice/la barbara, Linné. 
Fromtphotographs by Mr. W. B. Crump, Halifax. 
