62 THE ZOOLOGIST. 



brates besides Corophium ? These matters may be worth the 

 attention of ornithologists. 



P.S. — Writing on January 28th Mr. Kershaw says: — "I have 

 not seen more than three Gulls on the sands for weeks. They 

 are Black-heads, and the black feathers are beginning to come. 

 One is the bird I mentioned before — it trails one wing, but seems 

 to fly all right. . . . Yesterday I marked out two areas of 

 sand, four inches square each, one on the edge of the solid sand 

 near the high-water mark, and the other farther out. I dug 

 down for about six inches (although none of the burrows went 

 down farther than three inches), carried the sand indoors, and 

 passed it carefully through a muslin sieve. There were forty-six 

 Corophium Shrimps, three "Worms (Nereis), and a few (Tellina) 

 shells about an eighth of an inch long. ... I have not seen 

 any Gulls ' dancing ' lately." 



According to these observations the crustaceans are fourteen 

 times more abundant in July than they are in January ; and, 

 clearly, their disappearance cannot be put down to migration. 

 Ornithologists are only too well aware of cases where the pheno- 

 mena of migration have been explained by a theory of hyber- 

 nation, but I cannot recollect an instance like the present case 

 of Corophium, where migration has been suggested, when hyber- 

 nation appears to be the fact. 



