TROCHID, 93 
angled, more or less sulcated along the keel ; colour variable ; generally 
yellowish-white, with radiating chestnut rays ; rays often purple or pink ; 
sometimes entirely brownish-pink, with an iridescent play of colours ; 
columella white, with a circular band of purple. 
Length, °5; breadth, -85; angle of spire, 92° to 111°. 
Common. Auckland to Dunedin. 
Although this shell is very common on sandy beaches, I have never 
obtained one alive. 
Sub-Family— Trochine. 
Operculum horny, orbicular, composed of numerous narrow whorls, 
with the nucleus central. Shell conoidal or pyramidal, the last whorl 
more or less angulated at the circumferance, and usually flattened 
beneath ; aperture more or less transverse, wider than long. 
A.—Shell subulately conical ; porcellanous ; aperture 
not pearly within” - - - - - Bankivia. 
B.—Shell conical, with a flat base. 
a.—Umbilicated. 
Margin of umbilicus smooth - - - Anthora. 
sane: pe crenated - - - Clanculus. 
6,—-Imperforate. 
Aperture quadrangular - - : - Lizyphinus. 
C.—Shell elevately conoidal ; imperforate. 
a.—Columella, more or less toothed. 
Whorls granulated or ribbed - - - Thalotea. 
Whorls smooth or polished - - - LElenchus. 
6.—Columella not toothed. 
Outer lip thin - . : - = - Cantharidus. 
D.—Shell conoidal. 
a.—Umbilicated. 
1.—Aperture subrhomboidal. 
Columella simple — - - . . - Gibbula. 
A spiral ridge encircling the umbilicus = -_- Ch/orostoma. 
2.—Aperture circular. 
Whorls with granular ribs - - = - Luchelus. 
Whorls smooth or striated- - - - Margarita. 
6.—Imperforate. 
Columella forming a ridge on the outer lip- De/oma. 
a ending in a small tubercule - TLrochocochlea. 
E.—Shell depressed. 
Umbilicus wide, callous. - - - - Monitlea. 
Genus, ANTHORA—Gray. 
Shell conoidal; whorls compressed, sub-quadrate, flat in front; 
aperture contracted, quadrangular; pillar lip twisted, simple; axial 
cavity moderate, narrow, with several opaque sub-spiral ridges. 
A. tuberculata, Gray, Dieff: N.Z, ii., p. 239; Voy. Erebus 
