170 CATALOGUE OF THE MOLLUSCA 
Anomia cylindrica, Turt. Brit. Biv. 232. 
On the stems of sea-weeds, not uncommon. 
77. OSTREA, Linneus. 
1. O. Eputis, Linn (common oyster). 
Ostrea edulis, Mont. Test. Brit. 151. 
Not common. Frequently found on the shells of crabs. The 
only oyster-bed on the coast is at Holy Island. 
The following remarks on this oyster-bed are from our friend 
Dr. Johnston’s “ Catalogue of the Bivalved Shells of Berwickshire 
and North Durham” :— 
“Tn the inventory of the Priory of Holy Island for 1381-2, 
we find expended for ‘a sloop (iavicula), bought of a certain 
Scotchman (de quodam Skoto), with the oysters and other 
goods contained in it, 100s.’ From the nature of the purchases, 
Mr. Raine thinks it may be inferred ‘that there were at that 
period no oysters to be procured at home’ ; and suggests that 
the oysters of this very cargo were the founders of the present 
valuable colony.—(Hist. V. Durham, p. 110.) The conjecture 
is, I believe, unfounded ; for not many years since, the oysters 
being exposed by the unusually great recess of a spring tide 
during the night to a severe frost, were all killed, and the bed 
had to be renewed from Preston Pans ; and if my information is 
correct, a similar accident has occurred more than once during 
the last half century.”—Johns. in Berw. Club. Proc. i. 80. 
Famity. Prcrinipm, Broderip. 
78. PECTEN, Miller. 
1. P. maximus, Linn. 
Pecten maximus, Mont. Test. Brit. 143. 
In deepish water, rather rare. Cullercoats. Hartlepool. Fre- 
quent in the north of Northumberland.—M/r. R. Hmbleton. 
2. P. opercuLARIS, Linn. 
Pecten opercularis, Mont. Test. Brit. 145. 
In shallowish water, frequent. 
The depth at which this species lives appear to vary consider- 
ably, as we have a white variety presented to us by Mr. Richard 
