weaker moniliform girdle on the shoulder angle. Thirteen strong rounded axial ribs a whorl, from suture to suture, obsolete on the latter part of the body whorl of most specimens. Sides of whorls not vertical as in fracta, but expanding below the shoulder. Body whorl convex, expanding from the shoulder to the suture level then contracting rapidly.

Height, 6.4 mm.; diameter, 3.2 mm.

Locality: N165/507, Bell's Creek, Middle Tongaporutuan.

Vexillitra wainuioruensis n.sp. (Pl. 26, fig. 15.)

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Small, biconic, rather thin, glossy. Six whorls including protoconch of 1 1/2 whorls. Early post-nuclear whorls have broad, low, rounded, vertical axial ribs (24 on second post-nuclear whorl) which became obsolete on later whorls, hardly discernible on the penultimate and lacking on the body whorl. Shoulder, level, narrow; peripheral girdle weak, at first moniliform, but becoming smooth as the axials weaken. Body whorl descending nearly vertically from the peripheral girdle then contracting rapidly to the canal.

Height, 6.1 mm.; diameter, 3.4 mm.

Locality: N166/535, lower Wainuioru River, uppermost beds of Hurupi Formation, Basal Tongaporutuan, unique holotype.

V. marwicki n.sp. is readily distinguished by the fewer and stronger axials, and the sloping sides of the whorls. V. fracta Marw. has 16 axials per whorl, very much weaker than on marwicki, and has about 5 obsolete spiral grooves on the body whorl.