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 have 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 



