36 Macteay Menmoriat Vouume. 
of so many extinct forms; for the recent species are far more common than the extinct 
ones, and the latter are more local and often rare. We seem to be dealing with the 
remains of an earlier fauna disappearing rapidly before the conquering host of the 
recent fauna, which had invaded New Zealand some time previously; and if this idea 
is correct we might expect to find some of the Pliocene forms which are now extinct 
on the shores of New Zealand still lingering in the outlying islands. This appears 
to be the case with Natica vitrea, Cancellaria trailli, Trochus chathamensis and 
Dosinia grayt, of the Chatham Islands; but further investigation is necessary, for at 
present the only collections sent from the Chatham Islands have been dead shells 
picked up on the beach. 
Clas GASTEROPODA. 
Genus AMPHIBOLA. 
AMPHIBOLA AVELLANA, Chemnitz, Conch. Cab. V. figs. 1919-1920 ; Ampullacera 
avellana, Quoy and Gaimard, Voy. Astrolabe, Zool. II. p. 196, pl. xv. figs. 1-9 ; 
Amphibola australis, Woodward, Manual of Mollusca, pl. 1x. fig. 33. 
Locality.—N apier. 
Genus RINGICULA. 
Rinercuta unrpuicata, Hutton, Trans. N.Z. Inst. Vol. XVII. p. 313. 
Shell minute, ovate, finely transversely striated. Whorls four, those of the 
spire small and smooth. Aperture rather narrow, slightly obliquely notched in 
front; the outer lip thickened and reflexed; columella with the anterior plication 
much stronger than the posterior. Length 2mm. 
Locality.—Petane. 
Genus TORNATINA. 
Tornatina pacuys, Watson, Linn. Soc. Journal, Vol. XVII. p. 331. 
Locality.—W anganui and Petane. 
Genus TORNATELLA. 
Key to the species. 
Aperture more than half the length of the shell ... 500 0 hs Cee: 
a less than half the length of the shell... wt LD asulegia: 
