Volume 24, 1891
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Ord. Prosobranchiata. Sub - Ord. Pectinibranchiata.
Group Basommatophora.
Sec. Tænioglossa.
Fam. Hydrobiidæ.
53. Potamopyrgus antipodum, Gray. Common in creeks.
54. Potamopyrgus cumingiana, Fischer. In the large creek near Hastwell, on stones. The adult specimens deprived of spines. Large specimens are found in the Ruamahanga River, near Mauriceville.
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Fam. Cyclophoridæ.
55. Cyclophorus lignarius, Pf. Found one specimen only, in rotten wood.
Fam. Cyclostomatidæ.
56. Realia egea, Gray. Scarce near Hastwell; more numerous on the Mauriceville limestone hill, amongst dead leaves.
Realia egea, Gray, forma albina. Some specimens found in the last-mentioned locality.