b. Subgenus Eunaticina Fischer, 1885.
Shell longitudinally oval, spirally striated, umbilicated; body-whorl flattened; aperture distended; outer lip convex, moderately inclined; columella with a bulge opposite the umbilicus.
Type: N. papilla Gmelin.
Sinum (Eunaticina) cinctum (Hutton). (Plate 60, figs. 12, 16.)
1885. Sigaretus (Naticina) cinctus Hutton, Trans. N.Z. Inst., vol. 17, p. 318. pl. 18, fig. 12.
1893. Sigaretus cinctus Hutton, Macleay Mem. Vol., p. 55.
1915. Polinices (Euspira) cinctus (Hutton): Suter, N.Z. Geol. Surv. Pal. Bull. 3, p. 9, pl. 4, fig. 5.
1918. Sinum cinctum (Hutton): Suter, Alph. List N.Z. Tert. Moll., p. 25.
Although this specific name appears in many lists of New Zealand Mollusca, none of the specimens examined by the writer was correctly
identified. Hutton says that the type came from “Wanganui,” having been sent down by Mr. Drew; but, although many collections have been made at this locality since that time, no one has found another specimen. Both the late Mr. R. Murdoch and Dr. Marshall agreed that they had never seen a similar shell in all their material. The reddish-brown staining on the type is not quite the same as that of any specimens the writer has seen from Wanganui.
The shell is a typical Eunaticina, and as this is the only New Zealand specimen of the subgenus which has been seen it should not be unreservedly admitted as a member of our fauna. There is no direct proof that the shell is a foreign one which became mixed with New Zealand specimens; but such things did happen to Hutton (e.g., Trigonia semiundulata, Raeta perspicua, Chione lamellata, &c.), so that care must be taken in accepting doubtful species.