CHEMNITZIA. 429 
very large auricles, which in progression are used as feelers ; 
the margins of the foot are often reflexed, as if to embrace the 
sides of the shell; it is long, and when fully extended reaches 
to the third basal volution, and ends in a needle pomt; some- 
times on each side there is a row of small flake-white spots ; 
it carries on a simple upper lobe, scarcely distinguishable 
from the mass of the foot, a light corneous, thin, obliquely 
striated pyriform operculum. 
The animal marches with rapidity, and is far more active 
than the C. interstincta. It inhabits, with the variety “ cla- 
thrata,” a peculiar district of shelly mud, between the lamina- 
rian and coralline zones in ten fathoms water, off Teignmouth. 
That this is Montagu’s Turbo indistinctus is scarcely doubt- 
ful; he says that his examples have six volutions, and no fold 
in the aperture—that is the number of the ordinary run of 
specimens ; but both the type and variety, when very fine, 
have 64 to 8 turns, as our magnificent series will show. 
There can be no doubt of the C. indistincta bemg distinct 
from the C. ipterstincta ; we, i our first accounts, thought 
otherwise ; but the greater number of volutions, the variable 
absence of a tooth, the much more diffused lattice-work of the 
former, and the specific differences of the animals, afford 
decisive marks of distinction. 
We have examined more than twenty live specimens of the 
typical species, in comparison, often in the same vase, with 
forty of the variety “ clathrata,’ which only differs from the 
type, as regards the animal, in having the posterior volu- 
tions pale pink, giving the shell the appearance of being of a 
still paler pink hue, but in fresh shells the colour is a dull 
pearly white: this difference in the animals is probably de- 
pendent on food. Another variation, perhaps the effect of the 
same cause, ils, that the contour of the variety is somewhat 
less slender than the type; but the similar number of the 
volutions, the character of the lattice-work, and the want of 
the tooth in the aperture of both, together with the apparent 
identity of the animals, forbid the differences I have noticed 
to be considered of more value than of mere and not uncom- 
mon variations. 
