South Australian Shells. 
91. 
•S.A* IN AT., VOL. XV 
June 12tpt, 1934. 
last scarcely angled; margin of umbilicus dentate; columella very 
•oblique, not solute above, terminating below in a simple denti¬ 
cle; lip thickened and corrugated within. Height 8, diam. 12 
mm. Uncommon; beach, Pt. Willunga, Second Valley, Middle- 
ton, Normanville; dredged. Backstairs Passage, Gulf St. Vin¬ 
cent, to 20 fathoms. (Type locality—unknown. We designate 
Middleton, Encounter Bay, South Australia, where typical ex¬ 
amples are common). 
There are six to seven rather rounded whorls, last whorl 
I scarcely angulated, and with a rather convex base; spiral cin- 
guli on the upper whorls arc distinctly granulose, on the last al¬ 
most entirely smooth; umbilicus rather narrow, its margin den¬ 
tate; columella very oblique, not free above, with a small but 
prominent denticle below; outer lip thickened within; with five 
folds, but near the edge with numerous wrinkles. The margin 
1 -of the umbilicus is not in the slightest degree den¬ 
tate in immature shells, it is only when the mouth is fully 
formed that the dentate margin exists, and appears to be only a 
.dentate or granose edge of the apertural callus, traceable ali 
around the mouth. 
C. leucomphaliis Verco 1905. Depressed conic, 
rather thin; light ashen-grey, with obscure flames of deeper grey 
or buff, and with numerous small pink dots on the second and 
third whorls; umbilicus and its margin pure white, throat nac- 
creous green; spirals of smooth ovate granules, eight, close set, 
•on penultimate whorl; ten spiral rows of granules above the 
acutely angled periphery of the bodv whorl, the granules of the 
infra-sutural row much larger and placed axially, the rest spiral¬ 
ly ovate; ten rows on base of flatter, more quadrate, and more 
dose set granules; axial striae, oblique, crowd between granules 
on spire, but obsolete on base; aperture quadrate oblique; outer 
lip crenulate, toothed just within the margin opposite each spiral 
lira, within this thickened and wrinkled, and in the throat 1 irate 
and nacreous; basal lip crenulate, thickened within with five 
teeth gradually enlarging towards the columella; columella ob- 
lique, nearly straight, ending below in a prominent, obliquely 
furrowed but not bifid tooth, a large tubercle at the junction of 
its upper and middle third, and with a flange throughout its 
whole length bent towards the umbilicus; umbilicus wide and 
deep, with a ftinkle winding up its outer side to the tubercle 
•on the columella; umbilical border overhangs, with six tubercles, 
and margined by a flat, axially Incised, spiral lira, with a thread- 
let on either side. Height 8, diam. 9.75 mm. Backstairs Pas¬ 
sage, dredged alive 20-23 fathoms, dead in 6-23 fathoms (Type 
-locality); one specimen from Levens Beach, height 12, diam. maj. 
