Sec. Tænioglossa.

Fam. Hydrobiidæ.

23. Potamopyrgus corolla, Gould. Birch Hill Lagoon and outflowing creek. All the specimens I have seen were deprived of spines.

Class Lamellibranchia.

Fam. Cyrenidæ.

24. Sphærium neozelanica, Desh. Plentiful in Birch Hill Lagoon, Tasman Valley.