300 Proceedings of the Royal Physical Society. 



Rissoa costata (Adams). 



Common in tlie shell sand at North Ber- 

 wick and Dunbar {M.). 



B. jparva (Da Costa). 



Firth of Forth {WB). 

 Not so common as the variety interrupta. 

 Good specimens at North Berwick and 

 Dunbar {M). 



R. parva, var. interrujota. 



Very common on seaweeds at low water 

 at Granton, North Berwick, etc. (M.). 

 We have found this variety on the shore 

 near Aberdour. 



R. striata (Adams). 



Firth of Forth {M'B). 



Alive among small seaweeds in rock pools 



at low water, North Berwick. Common 



in shell sand at Dunbar, North Berwick, 



Belhaven, Granton, etc. (if.). 



We have found it in sand at Elie. 



R. striata, var. arctica. 



Occurs with the species, but is less com- 

 mon {M.). 



R. vitrea (Mont.). 



Eare in the shell sand at North Berwick 



(31.). 



It has been found at Dunbar by Bingham. 



R. semistriata (Mont.). 



Firth of Forth, 7 fathoms {F. and K). 

 Common in the shell sand at North Ber- 

 wick (if.). 



R. cingillus (Mont.). 



North Berwick, in the shell sand, but not 



plentiful (if). 



We obtained this species on the shore near 



Largo. 



Hydrohia ulvce (Penn.). 



Ahve at Pefferburnfoot, Aberlady; dead on 

 the beach at Cramond, Newhaven, North 



