AMPIIITHOE 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 Cumming, of Altyre. It represents 
Hell’s Hole, alias Hallis Hale, *. e» the Mouth of the 
Harbour. 
