39 
Tvophon aucklandicus (Smith). 
Stewart Island: 33, 2 sps., h. 8.5. — Auckland Island: 37a, 
8 sps., h. 12.5. 
Trophon corticatus (Hutton). 
South Island: 29, 2 sps., h. 14. 
Trophon curtus Murdoch. 
North Island: 11a, 1 sp., h. 8. 
Trophon plebeius (Hutton). 
South Island: 30, 1 sp., h. 10. 
Trophon pusillus S u t e r. 
North Island: 10, 1 sp., h. 6. — 22, 1 sp., h. 6.5. — 24, 1 
sp., h. 7.2. — Auckland Island: 43, 4 sps., h. 10. 
Trophon mortenseni n. sp. 
(PI. I, figs. 26, 27; text-fig. 5.) 
Shell turreted, spire equalling aperture with canal in height. 
Whorls 7, convex, distinctly shouldered, suture deep. Sculpture: 
the 2 apical whorls entirely smooth, subsequent whorls with strong 
longitudinal costae, 12—13 on the two last whorls, evanescent on 
the canal, separated by as broad interstices and crossed by strong 
revolving cords, 2—3 in the 3rd and the next 
whorls, 13 on the last, of which 1 small on 
the shoulder and 5—6 on the canal; angular 
keel strengest, grooved all along (or both 
parts wholly separated); grooves between the 
spiral cords narrower than these latter; irre- 
gular elevated lines of growth besides giving 
the surface a crispulate appearance. Colour 
faintly cream-white, sometimes with a light brownish hue translucent 
into the interior of aperture. Aperture ovate, its outer lip thin; 
columella with an indistinct fold below limiting the narrow, slightly 
bent canal, the length of which somewhat exceeds the height of 
aperture. Dimensions: H. 12.6, br. 5.8 mm. Operculum (PI. I, 
fig. 27) lanceolate ovale with subapical apex. 
Fig. 5. A row of teeth (one 
median and each one 
lateral) from the ladula of 
Trophon mortenseni n. sp. 
X 440. 
