Polinices blaesus n. sp. (Fig. 62.)

Shell of moderate size, spire relatively high; body-whorl compressed for some distance below suture for last half whorl. Suture ill defined. Surface smooth. Aperture semilunar. Outer lip joining suture at about 85° but curving round to retreat rapidly in a broad curve. Apertural callus moderate, with canal at posterior end along inside of projecting outer lip, and broad depression about middle subdivided by wide faint ridge; outer edge of callus opposite transverse depression drawn up in thin layer to obtuse angle on parietal bulge of whorl. Umbilicus restricted to merest penetrating chink.

Holotype in Dominion Museum.

Height, 32 mm.; diameter, 24 mm.

Closely related to P. obstructus (Marw.) but differing in poor development of transverse grooves of callus. Also the mass of the callus does not extend so far out of the aperture. The compression of the body-whorl below the suture if constant should provide ready means of identification.

Polinices lobatus (Marwick).

1924. Uber lobatus Marwick, Trans. N.Z. Inst., vol. 55, p. 562, pl. 58, fig. 2.

The single specimen is a gerontic individual with a contracted outer lip. The apertural callus is not so well grooved and is narrower than the typical P. lobatus, but more specimens are required to show how constant these differences are.