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Genus Acuminia Dall, 1908.
Type: Terebra lanceata Linné.
Acuminia transitorsa n. sp. (Fig. 69.)
Shell of moderate size, acuminate, turriculate. Spire 3½ times height of aperture. Whorls cylindrical, bulging noticeably just below the suture, body-whorl with base quickly contracting to short, slightly twisted neck bearing well marked fasciole which is sharply limited exteriorly by narrow ridge. Protoconch not preserved in available specimens but probably polygyrate with small nucleus. Sculpture of about 22 low, narrow, flexuous axials with wide flat interspaces. Aperture rhomboid, produced below into deeply-notched canal. Outer lip with broad shallow sinus above and another on base. Columella smooth, twisted to canal but with no other fold.
Holotype in collection of N.Z. Geological Survey.
Height, about 42 mm.; diameter, 8.5 mm.
This shell is readily distinguished from the common one at Target Gully by the more-transverse coiling of the whorls owing to
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their greater comparative width. Also the well-developed bulge below the suture gives a more-strongly gradate outline. Suter always identified the Target Gully shell as his T. orycta, but the type of that species is too poorly preserved for diagnosis. Topotypes should be collected and compared with the Target Gully specimens.
Acuminia suteri n. sp. (Fig. 70.)
Shell elongate, conic; spire about twice height of aperture. Proto-conch polygyrate, subconic, with small nucleus. Post-embryonic whorls seven, almost flat on spire. Body-whorl angled at periphery which is followed by suture. Base convex, contracting quickly to short twisted neck which bears strongly marked fasciole bounded exteriorly by a ridge. Sculpture: each later whorl with 14 strong, narrow axial ribs with wide concave interspaces. The ribs are slightly higher at both ends and stop suddenly just below the periphery. Whole surface with numerous, close, waved lirae. Aperture subquadrangular, produced below into short twisted canal with deep anterior notch. Columella smooth, twisted below to form the canal. Inner lip smooth, obliterating sculpture of base and fasciole apparently by solution.
Holotype in collection of N.Z. Geological Survey.
Height, 13.5 mm.; diameter, 5 mm.
Distinguished by the broad apical angle, angled periphery and quickly-contracting base.