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. 



