170 
SPECIFIC 
Habitat unknown. 
The general appearance of the shell bespeaks it 
a Helix, and not a Trochus as it has hitherto been 
designated. The convexity of the columella, and 
the upright situation and form of the aperture, 
irresistibly confirm the first impression. 
♦ 
PLATE XXIV. 
This plate is intended to point out to beginners 
in Conchology the great difference which exists, in 
certain species, between the shell in its young, 
unfinished state, and the same arrived at its per- 
fection. The examples adduced are among the 
most conspicuous, but there are many others of 
which it would be very beneficial to students to 
acquire an early knowledge. 
The mature specimen of Buccinum Yihex is 
given in Plate XXL Fig. 3. 
i 
I 
