94 TROCHID. 
and Terror, Moll., pl. 1, f- 6; T: acinosus, Gould. Shell conical, rather 
produced, whitish ; whorls flat, with four series of large rounded tuber- 
cles ; the front of the last whorl flat, with rather close spiral ridges, the 
inner ones the largest, and the outer ones very small ; umbilicus conical, 
with three spiral ridges ; opaque-white (Gray.) 
Auckland to Dunedin. Chatham Islands. 
A. tritonis, 4. Adams, P.Z.S., 1854, p. 132. Shell elevatly-coni- 
cal, pseudo-umbilicated, green variegated with white; upper whorls 
rather gibbous, ornamented with transverse rows of granules; last whorl 
angulated, the base concave, white, concentrically striated, umbilical 
region funnel-shaped ; columella tortuous above, the margin tubercu- 
lated (Adams.) 
New Zealand. (Cuming.) 
Perhaps the same as the last. 
A. viridis, Gmelin; Reeve, Conch. Ic. (Trochus), f- 79; T: fulvo- 
labris, Homb. and Jacg., Voy. Pole ‘Sud., p. 56, pl. 14,7 14-16. Shell exca- 
vately umbilicated, conical, green ; whorls seriately plicately grained ; 
grains sometimes small and obtuse, sometimes larger, fewer, and some- 
what spinous ; base flatly concave, circularly striated (Reeve.) 
Perhaps the same as A. ¢uberculata. 
A. chathamensis, Hutton, CMM, p. 36. Whorls flat, with 
an elevated upper edge, and, together with the base, spirally striated ; 
columella with a slight posterior fold, anterior portion nearly smooth ; 
axial cavity small, smooth ; white with pink or brownish-purple mark- 
ings ; base white, with interrupted pink spiral lines. 
Length, °3 ; breadth, :35 ; angle of spire, 70°. 
Chatham Islands only. 
A. tiarata, Quoy, and Gaim., 1c, iii., p. 256, pl. 64, f. 6-11; P. 
elegans, Gray, Dieff. N.Z., ii., ~. 238. Whorls slightly convex, often 
with an elevated upper edge, and six or seven spiral rows of beads; , 
columella with a slight posterior fold, anterior portion toothed or 
smooth ; axial cavity deep, smooth, conical ; white with brownish-purple 
dots both on the upper surface and on the base ; ; axial cavity white. 
Length, 45; breadth, ‘6 ; angle of spire, 75°. 
Common in the North, ‘rare in the South Island. Dunedin. A 
very variable shell. 
Animal: Tentacles and filaments white ; foot white, with a brown, 
border below, and a broad black band on the sides; mouth black 
(Quoy.) eae a 
For an account of an abnormal form of operculum in this species, 
see Gray, Ann. Nat. Hist., series 2, vol. 18, p. 468. 
- Genus, CLANCULUS—Montfort. 
Shell conoidal ; axis imperforate ; whorls almost always granulated, 
the last rounded at the periphery ; aperture usually narrowed ; columella 
spirally twisted above, forming a false umbilicus, with a crenate margin; 
