ESCHARID. 333 
pora is as safe on the outside of the Patella as it could 
possibly be in the inside of the Buccinum, and this while 
the inmate of the cerulean limpet is yet alive. 
Famity ESCHARID/. 
**T stood upon a smooth and sandy shore,— 
’Twas one of Autumn’s bright and sunny days,— 
The sea was clear as crystal—hush’d its roar, 
And distant mountains soften’d by the haze ; 
Green were the waters, and the sky deep blue 
Reflected in them form’d a lovely hue: 
Huge porpoises were rolling o’er and o’er, 
And fishermen were busy on the shore, 
Mending their nets to cast into the deep, 
That they of ocean’s stores their share might reap ; 
While dove-like mews were hovering o’er the sea, 
Dipping their wings and feet luxuriously.””—MMiss S. Beever. 
Several species of the Hscharide have certain singular 
organs attached to the cells, and called the avicularium, or 
bird’s-head, in consequence of their shape. Dr. Johnston 
has recorded some interesting remarks made on them in 
foreign species by Mr. Darwin; and I am happy that I am 
permitted to copy the following observation made on them 
in our native species, by the Rev. T. Hincks, of Exeter. 
“The ‘bird’s-head processes,’ with which some of the 
