CHEMNITZIA. 435 
like Ch. pusilla, and the tentacula are carried more in a line 
with the body than in that species ; the shell is also more taper 
and of a more opake, sordid texture, but recent examples must 
be compared to see the value of this distinction. 
This is the first year I have succeeded in obtaining live 
examples, which occurred in the littoral zone off Budleigh 
Salterton, where in former years I have taken abundance of 
fresh, excellent shells, but always without the inhabitant. 
The existing malacological notes on this animal are so meagre, 
that the present account may almost be considered as that of 
an unrecorded creature. 
Cu. pusitia, Philippi. 
Ch. elegantissima, var. pusilla, Anglorum, et Brit. Moll. iii. p. 243, 
and iv. p. 275. 
A single live specimen of this very distinct species has 
occurred, which enables me, more decisively than any of its 
congeners, to insist on the position, that the eyes and tenta- 
cula are planted across the rostrum, which is an undoubted 
continuation of the neck. What has led to the idea that the 
so-called mentum belongs to the foot, is, that the pedal union 
with the general body of the animal is in this tribe a little 
more anteally advanced than in the Rissoe of similar propor- 
tions, thus giving the neck, and its sequence the rostrum, an 
apparent connection with the foot, which, if organically viewed, 
it does not really possess. 
It will only be necessary to notice the variations of the 
C. pusilla from its more stately congener the C. elegantissima. 
It is, as respects the shell, not half the size, is much more tumid, 
and does not taper in the decided manner of an example of 
that species of similar size. The variations of the malacology 
are more pronounced : the foot is much longer, extending on 
the march to the third basal volution, and terminating in 
almost a needle pomt; whilst im the other, m a similar con- 
dition, it is quite rounded, and does not reach beyond the 
body-whorl. In the “ pusilla,” the tentacula when spread 
have the membranes united almost to the extremities, which 
are minute and pointed, so that they appear in action as a single 
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