3. Siphonaria obliquata, five specimens, with the animal mounted for anatomical examination, from Lyall Bay; collected by Miss Mestayer.
The internal structure of this animal was very interesting, as, owing to the form of the external shell, it was formerly classed with the limpets. It belonged, however, to the same group of Pulmonata as the curious shell Amphibola, which was abundant on all mud-flats, but was peculiar to New Zealand, and apparently to very recent times, as, with one doubtful exception, it had never been found among the deposits of even sub-fossil shells. As its breathing apparatus and horny operculum connected it with land, marine, and fresh-water Mollusca, it was curious that a type so little specialised should be of recent creation.