104 HALIOTID&. 
FAMILY—HALIOTID. 
Radula with a small median tooth, flanked by two beam-like laterals 
and numerous uncini with denticulated hooks, the four inner being very 
large. Head witha short broad muzzle; tentacles subulate, with the eyes 
on stout cylindrical peduncles at their outer bases, and with a fimbriated 
lobe, or an emarginate veil between them. Mantle margin fissured in 
front, the left lobe elongated into an anal siphon, occupying the anterior 
perforation of the shell ; gills two, unequal. Foot thick and fleshy, the 
sides with a double membrane, furnished with serrated lobes and _fila- 
ments on the edges, and continued anteriorly in a free crest under the 
head. Operculum none. Shell ear-shaped; aperture large, nacreous 
and iridescent internally, perforated with a series of holes. 
Genus, HALIOTIS—Linneus. 
Ear-shaped, with a small flat spire; aperture very wide, iridescent, 
exterior striated, dull; outer angle perforated by a series of holes, those 
of the spire progressively closed; muscular impression horse shoe- 
shaped, the left branch greatly dilated in front. 
H. iris, Martyn ; Lamark, 1c., ix., p. 23; Reeve, Conch. Ic., f. 37. 
Spire small, obtuse; outer lip continuous and produced beyond the 
body whorl; columella slightly concave, the posterior end not curved 
into a spiral; outside rugose, plicated; outside pale brownish-white ; 
interior dark metallic-blue and green, with yellow reflexions and an ir- 
descent play of colours ; paler in the young. 
Breadth, about 6-5 inches. 
Common. Chatham Islands. Auckland Islands. Auckland to 
Dunedin. 
H. rugoso-plicata, Chemnitz; Reeve, Conch. Ic., f. 7; Chenu, 
Go 27345, ae australis, Lamark, 1.05 1%, p- 25. @opire large, optuse, 
body whorl with obliquely longitudinal plications crossed by fine trans- 
verse rough strize; posterior portion of outer lip not projecting beyond 
the body whorl; posterior end of columella produced into a_ broad 
spiral; outside pinkish-brown ; interior pale, highly iridescent. 
Breadth, about 3°75. 
Omaha to Dunedin. Chatham Islands. Auckland Islands. South 
Australia. 
H. gibba, PAlippi, Abbild und Besch, Conch. Hatliotis, pl. ix., fi 2; 
Reeve, Conch. It., f- 42; Voy. Erebus and Terror, pl. 1, f. 16. Spire 
moderate, obtuse ; body whorl longitudinally grooved, and irregularly 
transversely plicated; posterior portion of outer lip not projecting 
beyond the body whorl; posterior part of columella much curved, but 
hardly spiral ; outside variegated with green, brown, and white ; interior 
pale, highly iridescent. 
Breadth, about 2°5. 
Not so common as the others. 
Omaha to Dunedin. Chatham Islands. Campbell Islands. 
