Isidora novæ-zelandiœ, Sowerby (1873), sp.

Physa novœ-zelandiœ, Sowerby, Reeve, Conch. Icon., vol. xix., Physa, sp. 29 (1873). Physa novœ-zelandiœ, Hutton, Man. N.Z. Moll., p. 30. Bulinus novœ-zelandiœ, Hedley and Suter, P.L.S. N.S.W. (2), vol. vii., p. 627. Bullinus novœ-zelandiœ, Suter, Journ. de Conch., vol. xli., p. 232.

The diagnosis of this species is also contained in Hutton's Manual, and I reproduce here a figure (4) from a tracing of fig. 29b in Conch. Icon. Taken from the figure the dimensions are—Shell: length, 20½ mm.; breadth, 12¼ mm. Aperture: length, 15 mm.; breadth, 6 mm. Proportions—i. = 1: 1.7; ii. = 1: 2.5; iii. = 1: 1.4.

Fig. 4.

I have only two specimens from the North Island, exact locality unknown. One adult specimen has smooth whorls, the other, not full-grown, is shouldered. The dimensions are—Shell: length, 17 mm.; breadth, 12 mm. Aperture: length, 14 mm.; breadth, 6½ mm. Shell: length, 14 mm.; breadth, 9½ mm. Aperture: length, 10 mm.; breadth, 4½ mm. The mean proportions—i. = 1: 1.5; ii. = 1: 2.2; iii. = 1: 1.3. The adult specimen is of chestnut-colour, the young horny-olive. The spire is shorter and the last whorl not quite so broad posteriorly, nor so flat at the periphery, as the figure of the type indicates.

Type in Mr. Sowerby's cabinet (?).