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Volume 73, 1943-44
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Genotype: Levella tersa n. sp. Lower Miocene, N.Z.

Shell very small, thick, conic, smooth, imperforate. Protoconch smooth of about two whorls with fairly large, tilted nucleus which is somewhat immersed. Spire whorls gently convex, body definitely angled at periphery, base gently convex. Surface smooth and shining. Aperture subquadrate; outer lip bevelled and thickened within, inclined back from suture, slightly concave. Columella concave, smooth, merging below anterior margin. Inner lip slightly raised, expanded, but solid. No umbilicus.

This genus is perhaps related to Micrelenchus Finlay, 1926, type Trochus (Gibbium) sanguineus Gray, but it differs in the tilted nucleus, absence of spiral sculpture and in the sharply defined, solid, raised outer margin of the inner lip. It somewhat resembles Boutillieria montensis (Br. and Corn.), but probably only superficially,

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Figs. 1, 2.—Chlamys venosa (Hutt.). Holotype × 1.4; plesiotype, Bridge Point, × 1.2.
Fig. 3.—Janupecten subteres n.sp. Left valve, 1821 Wharekuri, × ·75.
Figs. 4—6.—Cardilona bensoni n.gen., n.sp. Holotype × 1.25.
Fig. 7.—Janupecten subtcies n.sp. Holotype × ·8.

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Fig. 8.—Macrozafra formosa n.sp. Holotype × 7.5.
Fig. 9.—Goniscala di [ unclear: ] nina n.gen., n.sp. Holotype × 7.
Fig 10.—Thungia infulata n.sp. Holotype × 10.
Figs. 11. 12—Plesioti [ unclear: ] tton (Turchua) dubius (Marshall) n. sgen. Holotype × 1.5.
Fig. 13.—Gonimgrtea discus n.sp. Holotype × 6.
Fig. 14.—Gegania (Tubena) viola n.sgen., n.sp. Holotype × 12.
Fig. 15.—Levella tersa n.gen., n.sp. Holotype × 20.
Figs. 16, 22.—Myrtea valdesculpta n.sp. Paratype and holotype × 6.
Figs. 17–19.—Pyrgiscilla festiva n.sp Holotype × 16.
Fig. 20.—Pteromyrtea exilis n.sp. Awamoa right valve with left hinge × 6.
Figs. 21, 23.—Pteromyrtea exilis n.sp. Paratype and holotype × 6.
Figs. 24, 25.—Tipua tricineta (Marshall) n.gen. Holotype × 7.

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Fig. 26.—Gonimyrtea discus n.sp. Holotype × 6.
Fig. 27.—Pteromurtea exilis n.sp. Holotype × 6.
Fig. 28.—Waikura davidt n.sp. Holotype × 10.
Fig. 29.—Myrtea valdesculpta n.sp. Holotype × 6.
Fig. 30.—Gegania (Tubena) viola n.sgen., n.sp. Holotype × 5.
Fig. 31.—Levella tersa n.gen., n.sp. Holotype × 10.
Fig. 32.—Pyrgiscilla festiva n.sp. Holotype × 8.
Fig. 33.—Clathrus mackayi n.sp. Holotype × 1.7.
Fig. 34.—Mauidrillia brou [ unclear: ] oni n.sp. Holotype × 7.

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as the type and other European species of Boutillieria show little resemblance.

Levella tersa n. gen., n. sp. Plate 26, fig. 15; plate 27, fig. 31.

Height, 3·2 mm.; diameter, 2·3 mm.

Locality: G.S. 2222, Siltstone Allday Bay (Awamoan).

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