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1. Notoplejona n. gen.
Shell rather small, fusiform. Spire turreted. Fasciole well marked. Sculpture of strong axial ribs bearing double row of spines, one below suture, one on periphery; whole whorl with spiral lirae often stronger anteriorly. Aperture deeply sinused next suture and deeply notched below. Outer lip thickened, reflexed, crenulated, sharply angled where sutural row of tubercles abuts. Columella convex with 4 or 5 weak posterior oblique folds and a stronger spaced anterior one. Inner lip with a thick callus-pad.
Type: Athleta necopinata Suter.
Notoplejona necopinata (Suter). (Plate 66, figs. 2, 5.)
| 1917. |
Athleta necopinata Suter, N.Z. Geol. Surv. Pal. Bull. 5, p. 40, pl. 5, fig. 7. |
| 1918. |
Plejona necopinata (Suter), Alph. List N.Z. Tert. Moll., p. 23. |
Owing to faulty material, Suter's description of the columella is not correct. On very early whorls there is but one strong plait, well down on the columella; later a second weak one appears posteriorly, and afterwards three others (sometimes more) in succession; the posterior plaits are grouped together, remain much weaker than the anterior one, and the columella is straight until the adult stage is reached. Here the four weak plaits are gathered on to a strong callus-pad, which extends to the anterior plait and tends to obliterate it. The protoconch is not preserved in any of the specimens, but it was evidently quite small.
Localities.—Greensand, Waihao Downs (type); 480, “Island sandstone,” Waihao River; 164, Greensand, Kakahu; 176, Black Point.
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Notoplejona lata n. sp. (Plate 66, fig. 1.)
Shell rather small, broadly fusiform. Spire turreted, about one-third height of aperture. Body-whorl with sloping concave shoulder, below which it contracts slowly at first, then quickly, finally straightening again; anterior with well-marked fasciole, bounded above by low broad ridge. Suture deeply impressed. Sculpture of 10 broad low axial ribs with wide interspaces, ribs extending almost to fasciole; on periphery of shoulder, also below suture, are strong tubercles; whole surface with numerous, undulating, spaced, bevelled, spiral lirae, weak over greater part of body, slightly stronger on shoulder, much stronger on anterior constricted part of whorl. Aperture with subparallel sides, deeply notched anteriorly. Outer lip thickened and reflexed, slightly crenulated. Columella strongly convex in adult, with about 5 weak folds, anterior one separated by wider interspace than others. Inner lip with a thick pad of callus burying but not obliterating spines and extending to suture.
Holotype in collection of New Zealand Geological Survey.
Height, 26 mm.; diameter, 14 mm.
Locality.—759, Castle Hill shaft, Kaitangata.
Easily distinguished from N. necopinata by lower spire and more squat shape.