32 INTRODUCTION. 



above, it points its origin rather to the littoral conditions which 

 once existed in its present locality. 



Other plants there are which, by a like association, imply 

 a similar condition ; amongst them we may mention Samolus 

 Valerandi, Iris fwtidissima and Rumex maritimus.* Sufficient 

 traces are, therefore, extant to bear common testimony with 

 the physical features to the great change which has been taking 

 place in the general aspect of the valley during the formation 

 of its present Flora. 



* Additional interest has been added to these conclusions by the capture 

 of the rare moth Eremobia ochroleuca at Harlestoii by Mr. C. Candler, and 

 at Denton by the Rev. C. T. Cruttwell. Its few known haunts are on or near 

 the sea-coast. 



