97 



JOURNAL OF CONCHOLOGY. 



Vol. 13. 



OCTOBER, 1910. 



No. 4. 



NOTICE TO MEMBERS AND OTHERS. 



The Council of the Concliological Society wishes it to be clearly 

 understood that, for the future, lost numbers of the Journal will not 

 be replaced gratis, unless the loss be notified to the Hon. Secretary 

 during the year in which such number or numbers were printed. 

 This rule applies both to members' copies and to exchanges. 



CURIOUSLY DISTORTED ANODONTA CYQN/EA (L. 



By E. ARNOLD WALLIS. 



(Read before the Society, May nth, 1910). 



In March, 1898, while the Valley Pond at Scarborough was being 

 cleaned out, I found a remarkably distorted Anodonta cygncea. 



The pond is noted for the somewhat curious variety of this bivalve 

 which occurs in it. The specimens are all very dark in colour and 

 peculiarly heavy and tumid, and more or less distorted specimens have 

 not infrequently been taken there. There are no weeds in the pond. 

 The bottom is of soft fine mud with a great many stones among it. 



The specimen, photographs of which, taken by Mr. Wilfrid Jackson, 

 are reproduced, was lying between two stones, but was not in any way 



G 



