Trophon.} GASTROPODA. 409 



produced below into a short, open, and slightly recurved canal. Outer 

 !i}> convex, sharp, much thickened, denticulate or lirate inside, usually 

 with a larger tooth near the canal. Columella vertical, straight. 

 Inner lip spreading beyond the pillar, and as a thick callus over the 

 concave parietal wall ; a tubercle below the suture is mostly present ; 

 the lip is narrowed below and continued as the inner margin of the 

 canal. There is a distinct umbilical depression between the fasciole 

 and the canal. Operculuin with a subapical nucleus. 



Diameter, 16 mm. ; height, 23 mm. (specimen from Greymouth). 

 Diameter, 14 mm. ; height, 20 mm. (specimen from Oamaru). Dia- 

 meter. 21 mm. ; height, 35 mm. (specimen from Stewart Island). 

 Diameter, 31 mm. ; height. 55 mm. (very large, Hauraki Gulf). 



Dentition (Suter. J. Mai., vii, 56, pi. 3, f. 14). Central tooth with 

 the median denticle long, the 2 externals about half the length of the 

 median, and those between the central and outer cusps minute ; there 

 are 5 cusps altogether. 



Type in the Mus. Hist. Nat., Paris. 



Hob. The species is represented in my collection from the follow- 

 ing localities : Stewart Island ; Riverton ; Brighton, Otago ; Oamaru ; 

 Timaru (H. S.) ; Greymouth (R. Helms) ; Sumner (H. S.) ; Hauraki 

 Gulf (H. S.). Found under boulders between tide-marks. 



Remarks. The species is polymorphous, the form of the shell being 

 variable to some extent, but especially the sculpture ; some speci- 

 mens show strong spiral ribs, others only traces of them, whilst quite 

 smooth shells occur in the same locality. The specimen I found in the 

 Hauraki Gulf, which has a height of 55 mm., is a real giant of the 

 species, and the only example known to me from the North Island. 



5. Trophon squamatus, Button. 1878. Plate 19, fig. 3. 



Polytropa squamata, Hutt., J. de Conch., 1878,19; M.N.Z.M., 56; Man. 

 Conch. (1), ii, 178. Purpum rucjosa, Q. & G. : Button, C.M.M.. 16 ; 

 not of Quoy and Gaimard. Polytropa striata, Mart. : Hutton, T.N.Z.I., 

 xvi. 222 ; not of Mailyn. Purpum striata squamata, Hutt., Index, 72. 



Shell rather small, ovato-acute, solid, imperforate, spirally ribbed 

 and axially foliated, more or less distinctly shouldered. Sculpture : 

 The first whorl is smooth, the second has a few radiate riblets, the 

 third and fourth whorls have 2 spiral ribs, the upper one on the carina 

 of the shoulder ; crossed by distant axial ribs, points of intersection 

 nodulous ; the succeeding whorls have an additional spiral rib upon 

 the shoulder, and the last has 7 cinguli ; the lower whorls are orna- 

 mented with irregular, imbricating, and sinuous foliations ; fasciole 

 distinct. Colour white, the deep parts of the grooves light brown ; 

 mouth brownish-purple ; outer lip and columella white. Spire sharp, 

 conic, a little, less in height than the aperture ; outlines straight. 

 Protoconch papillate, of 2 whorls, white and translucent. Whorls 1. 

 first rather slowly increasing, slightly convex, more or less carinated 



