TRITONIIDA. 63 
M. vittata, Hutton, CMM, p. to. Sub-cylindrical, rather 
flattened below; spire concealed ; columella with four or five plaits 
near the anterior end; outer lip not thickened (young? ;) yellowish- 
white, with thin interrupted spiral bands of brown; columella white. 
Length, 353; breadth, °2. 
Two specimens in the Colonial Museum, Wellington, locality un- 
certain. 
Genus, ERATO—Risso. 
Shell smooth; spire distinct, conical; aperture narrow; outer lip 
thickened towards the middle ; columella with distinct plaits at the fore 
part. 
EK. lactea, Hutton, sp. nov. Shell smooth, white, or tinted with 
pale brown ; spire of four whorls ; right lip margined, slightly swollen in 
the middle, smooth within ; columella with four plaits, the two anterior 
more oblique than the other two ; the posterior the largest. 
Length, °5 ; breadth, -3 inch. 
Auckland to Cook Strait. 
Sub-Section— Tientogtlossa.. 
One row of rachis teeth, and three lateral plates on each side 
(20555 43.) 
Sertes-————— Proboscidifera. 
Head small ; proboscis retractile under the base of the tentacles. 
FAMILY—TRITONIID. 
Lingual teeth in seven rows (3. 1. 3.) central generally toothed ; 
lateral in three series, converging, the inner often broad, the two outer 
subulate, versatile; mantle enclosed; siphon straight; foot small ; 
operculum ovate, annular, nucleus sub-apical. Shell with varices on the 
whorls ; aperture with a straight canal in front. 
Genus, TRITONIUM—Link. 
Shell oblong ; spire prominent ; whorls with a few remote and non- 
continuous varices ; columella rough or smooth ; canal re-curved, short 
or long ; outer lip internally crenated or denticulated. 
T. australis, Zamark, l.c., ix., p. 625; Reeve, Conch., Ic., f. 12 ; 
Chenu, f.686. Spire produced ; whorls flattened, spirally grooved, both 
the grooves and the ridges sub-grooved; some of the ridges sub- 
nodular ; columella callous, with a tooth at the posterior end, and 
generally with some wrinkles at the anterior end; outer lip expanded, 
nodular, the nodules generally arranged in groups of two or three ; 
brownish-pink, variegated with brown, inside pinkish-white; columella 
