ON SOME MARINE MOLLUSCA. 153 



be living in the neighbourhood, especially as it had 

 been previously recorded from the Firth of Clyde 

 by Mr. Smith of Jordanhill, and the Rev. Dr. 

 Landsborough ; and although their evidence had 

 been doubted, the shell is so characteristic that it 

 could scarcely have been mistaken for any other 

 species, particularly by two naturalists of so eminent 

 a reputation. During the present month (April, 1887) 

 I am again indebted to one of my grandchildren, who 

 found another of these shells at low spring-tide on 

 the sands not far from where the other two were 

 found. The shell contained the live animal, leaving 

 no doubt of its living in the bay. This is all the more 

 remarkable, as in the same bay, which has been my 

 hunting-ground for many years, I have never noticed 

 a vestige of that shell dead or alive ; and it should 

 warn us from thinking that we had left nothing 

 behind untouched, however long or diligently the 

 ground may have been searched by us. 



