126 GASTROPODA. 



sometimes adorned with a tine spiral thread, crossed by irregular 

 sharp and oblique growth-lamellae, mostly worn off on the ribs ; fas- 

 cicle prominent, lamellate. Colour white or yellowish-white, aperture 

 white or brown within, porcellanous. Spiff elevated conic, variable 

 in height, usually the same as the aperture ; outlines lightly convex. 

 Protoconch minute, papillate, of 1J smooth convex whorls. Whorls 6, 

 the last high and ventricose, convex, base flattened and somewhat 

 contracted above the neck of the canal. Suture canaliculate. Aper- 

 ture subvertical, oval, subchannelled above, with a short open and 

 recurved canal below, its base notched. Outer lip thick, crenulated 

 by the spirals, toothed and lirate inside, the entire outline convex. 

 Columella vertical, lightly concave, a little twisted and tapering below, 

 broadly flattened. Inner lip moderately broad, extending broadly 

 over the excavated parietal wall, which bears a longish tubercle below 

 the suture ; the lip is narrowed below, with a free and sharp edge 

 towards the fasciole. Operculum ovate, with the nucleus sublateral. 



Diameter. 19 mm. ; height, 30 mm. (specimen from Te Onepoto). 

 Diameter, 27mm.; height, 38mm. (specimen from Te Onepoto). 

 Diameter, 25 mm. ; height, 41 mm. (specimen from Auckland Islands) 

 Diameter, 20 mm. ; height, 32 mm. (specimen from Campbell Island). 



Animal white ; siphon short, open below ; foot expanded anteriorly. 



Dentition (Hutton, T.N.Z.I., xv, 121. pi. 13. f. R). Central tooth 

 with 5 cusps, the median one isolated from the others, and sometimes 

 much longer. 



Type lost. 



Hah. From Cook Strait southward, on rocks near low-water 

 mark and in deeper water ; Chatham Islands ; near the Bounty 

 Islands, in 50 fathoms, embryonic shells (Captain Bollons) ; Auck- 

 land Islands ; Campbell Island. Brought to England by Captain 

 Cook. Also Kerguelen's Land. 



5. Thais scobina, Quoy and G-aimard, 1833. Plate 45, fig- 20. 



Purpura scobina, Q. & (4., Voy. Astrol., ii, 1833, 567, pi. 38, f. 12, 13 : DiefL 

 N.Z., 233 : M.N.Z.M., 57 : T.N.Z.I., xvi, 222 : Man. Conch. (1), ii, 

 170, pi. 51, f. 123 ; pi. 52, f. 12(i : Chall. Rep. xv, 173. 



Shell rather small, ovate-oblong, solid, turriculate. strongly spirally 

 ribbed, the ribs with hollcw spines or nodules, grey with brown mark- 

 ings. Sculpture consisting of prominent spiral ribs, 1 on the spire- 

 whorls and 3 on the body-whorl, a few spiral threads sometimes on 

 the shoulder and in the interstices ; they are adorned with regularly 

 spaced hollow spines or tubercles, 9 to 10 on a whorl ; the whole 

 surface ornamented with close laciniate growth-lamellse ; fasciole pre- 

 sent, strongly lamellate. Colour grey, brown, or white ; the scales 

 and nodules usually dark brown ; aperture blue inside, with a broad 

 chocolate-brown band margined with white inside the outer lip ; 

 columella chocolate-brown ; parietal wall with a black patch on the 



