AMPHITHOE LITTORINA. 



425 



and glued internally with a smooth and glutinous mem- 

 brane ; it is attached to the underside of stones, or is 

 embedded in some entangled fucus or conferva. A male 

 and female reside in each furrow, and Dr. Johnston had 

 observed them, when expelled from it, repeatedly return 

 and re-enter it. 



The following sketch was kindly drawn for this work 

 by Miss Gordon Gumming, of Altyre. It represents 

 Hell's Hole, alias Hallis Hale, i. e. the Mouth of the 

 Harbour. 



