394 GASTROPODA. {Pectinibranchia. 



1. Cantharus fuscozonatus, Suter, 1908. Plate 18. fig. 12. 



Tritonidea (Cantharus) fuscozonata, Suter, T.N.Z.I., xl, 1907 (1908), 370, 

 pi. 30, f. 5. 



Shell ovato-fusiform, spirally ridged and axially broadly costate. 

 Sculpture consisting of regular spiral lirae of subequal strength, the 

 interstices with 1 or several fine spiral threads ; the lirae more pro- 

 minent and further apart on the base ; axial ornamentation formed 

 by rather distant, elevated, and broadly rounded axial costse, about 

 15 on a whorl, the spirals passing over them ; they are getting obsolete 

 on the base. Colour fulvous, the spiral riblets purple, sometimes a 

 purple band above the suture and a second below the periphery of the 

 body-whorl are present, also longitudinal streaks of light brown ; 

 aperture whitish within. Spire conical, turreted, of the same height 

 as the aperture with canal ; outlines straight. Protoconch conical, 

 axially striate. Whorls 6 to 7, the last high, concave at the shoulder, 

 convex below it ; base contracted. Suture not deep, undulating. 

 Aperture somewhat oblique, narrowly channelled above, with an oblique, 

 narrowly open, and slightly recurved canal below, its base notched. 

 Outer lip thick, with a distinct varix outside, callous and denticulate 

 within. Columella vertical, concave, with transverse ridges over the 

 whole length. Inner lip narrow, spreading over the concave parietal 

 wall, which bears a tubercle above ; narrowed below to a point. Some 

 specimens have a distinct depression between the fasciole and the 

 edge of the canal. Operculum unknown. 



Diameter, 14 mm. ; height. 26 mm. (type). 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hob. East Cape Lighthouse (type) ; Foveaux Strait. 



Remark. This species is very variable in size, my largest specimen, 

 of 7 whorls, measuring 17 mm. by 32 mm. ; the smallest, also of 

 7 whorls, 10-5 mm. by 21 mm. : but numerous intermediate forms 

 occur. 



Subgen. 2. TRITONIDEA, Swainson, 1840. 

 Tritonidea, Swains, " Malacology," 74, 302. Type : Buccinum undosum, L. 



Shell spirally regularly lirate. with more or less distinct axial 

 costse, the spiral sculpture, however, being the predominant feature ; 

 whorls mostly convex ; outer lip subvaricose. lirate within ; colu- 

 mella with a few transverse ridges below. 



2. Cantharus Colensoi, Suter, 1908. Plate 18, fig. 13- 



Tritonidea Colensoi, Suter, T.N.Z.I., xl, 1907 (1908), 371, pi. 30, f. 6. 



Shell small, ovate, solid, distinctly broadly spirally lirate, and 

 more or less distinctly axially costate on the spire-whorls. Sculpture 

 consisting of broad and flattish spiral lirae, 3 on the penultimate, 9 to 



