Sentence:  "About a hundred yards further North" says Troutbeck, "is a 'subterraneous' cavern called the <WSD>Pope's</WSD> Hole, about fifty fathoms under the ground, into which the sea flows, so called from a sort of bird which roosts in it by night, about ninety feet high above the level of the water."!! [...] It derives its name from its being a place of shelter to some puffins, "vulgo" "<WSD>popes</WSD>". 
Meaning of the word marked with <WSD> tags:  The Atlantic puffin ("Fratercula arctica").