56 Beautiful Shells. 
in the African and Indian Seas. This is the T. 
terebras of naturalists; the first name referring to 
the turret shape commen to the genus, and the 
last being the Latin word for an auger, or piercer. 
The Reseate Turritella (7. rosea) is also sometimes 
seen in collections; the beautiful rosy tint of the 
live shell changes to a dull red or brown, on the 
death of the mollusk. 
TROCHUS, OR TOP-SHELL. 
“Of the shelled Mollusca which the dredge 
ever and anon brings up,” says Mr. Gosse, in his 
delightful volume on the Agquariwm, or Aqua- 
vivarium, as the glass tank in which living marine 
animals and vegetables are kept, is called, from the 
Latin aqua—water, and vivo—to live, “ the T'rocht 
are among the most conspicuous for beauty. The 
chief glory of this genus is the richly-painted 
internal surface of their shells, in which they are 
not excelled by any even of the true margaritiferous 
or pearly bivalves.” 
Of this Trochide family, a few of the members 
must be introduced to our readers; it is rather a 
