56 



Remarks on some Barnacles 



Lepas anatffera. 

 a, A portion of wood much perforated by the Teredo. 



B, The 7,dpas, with young individuals growing upon 

 the older. 



c, The animal exposed by the removal of the upper 

 lower valve ; a, The under lower valve ; b, The 

 body of lobes, that of each supporting a pair of 

 ciliated tentacula or feet ; c, The double interior 

 tubes. 



d, A single pair of ciliated feet, magnified ; «, One 

 of the two strong joints below the bifurcation. 



difficult to remove, and gave me an opportunity of examining 

 them here : but, owing to the carelessness of a servant, it was not 

 till after they had be£n out of the water nearly seventy hours 

 that I saw the creatures, when I found that they hact been 

 thrown away with the rubbish of the house. On their being 

 obtained, I immediately put tHem into a basin of salt water ; 

 and was pleased to see, that, though many of them had been 

 crushed, their native element almost immediately revived 

 them; and not ten minutes after their immersion, the languid 

 and reclining pedicles became erect, and the tentacula were 

 seen protruding from the shell, even in the minutest indi- 

 viduals. So sensitive were several of the larger ones, that, on 

 the approach of a candle suddenly, they instantly withdrew 

 the tentacula, as if the light had offended them. This I con- 

 sider a curious fact ; as it is certain that they have no eyes, 

 and live much in the dark, attached to the bottoms of ships, 

 and to piles, far under the surface of the water. 



