40 



Family Pectinid^. 

 Genus Pecten, Auct. 

 P. maximus, Auct. 



In deep water ; not common. 



P opercularis, Auct. &var. (linearis.) 

 With the last : abundant, 



P. niveus, Flem. 



In deep water, rare; although single valves are not uncommonly 

 thrown up en the beach. One of njy specimens measures two inches 

 and a half in length. 



The species seems to be diffused all over the western coast of Scotland, 

 and to take the place of P. varius, of which I could not find a single 

 specimen during my visit to that part of the country. 

 P. distortus, Mont. 



Not uncommon in deep water, attached to old shells of the P. oper- 

 cularis. The Pecten Pusio of Turton is the young of this species. 

 P. obsoletus, Mont. & var. (costatus,) 



In deep water ; not common. 

 P. aculeatus, (N. S.) 



With the last ; not common. A new and very pretty species. 



Genus Lima, Bruguiere. 



L. Fragilis. Pecten fragilis of Turton. 



In deep water ; very rare. 

 L. subauriculata, Flem. 



With the last ; not uncommon. One single valve taken by me is 

 nearly half an inch in length. 

 L. tenera, Turt. 



L. fragilis, Flem. 



With the last ; not uncommon. The specimens appear to be of a 

 larger size than those hitherto described ; one of them measuring an 

 inch and three quarters in length. 



