838 MYSID.F,. 



This is, perhaps, the most common ami the most widely 

 distributed of our native species. I have received it from 

 various parts of the coast, both of England and Ireland, 

 but from no place in such numbers as from Weymouth, 

 where it sometimes swarms. My late lamented friend, 

 Mr. William Thompson, informed me that he has taken 

 this species in numbers from the stomach of Corregonus 

 Pollan, caught in Lough Neagh, shewing that it occasion- 

 ally inhabits fresh water. 



