214 
almost confined to the inner edge. The teeth along the inner- 
margin are 29, narrow and very short, ending rather abruptly 
at their inner ends and rapidly becoming obsolete at their 
outer. The base is prolonged, thickened, and expanded on 
each side in front, especially on the left, and also at the back, 
where there is a considerable thickening round the notch, 
which is projected by it 8 mm. from the umbilicus, and some 
distance to the left of the centre of the spire. 
The colour is whitish, but except along the line of union 
of the mantle-folds and just above the margins the white is 
obscured by clouds and blotches of light yellowish-brown and 
scattered chestnut spots, an irregular line of which bounds 
the upper edge of the right mantle lobe. The top of the 
anterior beak is painted blackish-brown, as is also the right 
side of the callus of the outer lip behind at its junction with 
the body-whorl. The whole of the base and outer lip is of a 
rich apricot colour, deepest outside the columellar teeth, which 
it tinges, and on the callus forming the anterior and posterior 
projections of the inner lip; it extends to both lateral mar- 
gins and covers the dorsal surface of the anterior beak and 
the callus round the posterior notch. ‘The left side of the 
body-whorl is of a delicate faint lilac tint, which fades insen- 
sibly into the yellow, white, and chestnut around. The 
interior is a creamy-white. 
The animal is white, but the margin of its mouth is of 
a deep apricot colour, as is also the somewhat expanded semi- 
circular anterior end of the foot. The tentacles, about half 
an inch long, are of a paler tint, and so are their bases, 
which are about one-third as long and twice as stout, and 
bear the black eyes on their summits, outside the tentacles. 
Dimensions.—Length, 3°9 in.; breadth, 2°5 in.; height, 
2°2 in. 
Locality.—100 fathoms, Great Australian Bight, 60 
miles from shore, 80 miles west of Eucla, with 2 immature 
shells. The trawl worked over the sea bottom from 75 to. 
120 fathoms, so that they might haye come from any inter- 
mediate depth. 
The youngest example, taken at 80 fathoms in the Great 
Australian Bight 80 miles west of Eucla, is light and papery. 
It is 3 in. long by 2°2 in. wide and 1°9 in. high. Its outer lip 
is formed and bent in, and has 33 teeth, and there are 28 on 
the inner side of the aperture. The posterior notch touches 
the last whorl in the sunken spire, the anterior canal is smooth 
for 6 mm. beyond the teeth. There are faint axial growth- 
lines and numerous spiral flat bands. The ground-colour is 
white with a spiral disposition of brown smudges and streaks, 
which on the left side of the shell are united by a lighter 
