S.A. NAT., 
VOL. XVIII, No. 2. 
By TOM IREDALE. 
are apparently smooth, but sometimes show ^ra iioie' 
sculpture. The latest results tend to show that there are two 
distinct series occurring together and that to this fact is due the 
confusion which is not completely dispelled in this essay, but 
the way is cleaned a little. The indiejations suggest that 
Notobadistes will be used for the flindersi group and that Sinu- 
7nelon will include the remainder, though still further subdivision 
may be necessary. 
Key to Species. 
Shell globose, perhaps white, sculpture of rough radials, the 
shell dented, spire a little elevated, umbilicus nar- 
row, open, columella thickened, lips thickened 
mdlarboricum. 
Shell globose, spire short, sculpture strongly decussate, green, 
umbilicus narrow, hidden by columella bednalli. 
Shell flattened globose, spire little elevated, banded brown 
and fawn, width greater than height, sculpture very 
fine, umbilicus narrow but open, surrounded by a 
feeble ridge, lips of mouth notably reflected 
godireyi. 
Shell similar in shape and coloration but much larger, the 
last whorl similarly expanded, the umbilicus still 
open, sculpture still fine eupesum. 
Shell similar in form and color but much smaller and last 
wTorl more expanded, umbilicus wider 
expositum. 
Shell smaller, similarly broad, brownish with indistinct bands, 
upper surface Irregularly plicate finely, mouth still 
with lips expanded and umbilicus open jodinale. 
Shell still smaller, but similarly colored, spire a little elevated, 
sculpture a little coarser, umbilicus a little wider 
serlense. 
Shell more elevated, globose, banded red and white, stronger 
radial sculpture, umbilicus nearly closed by reflected 
columella, lips of mouth not as strongly expanded 
as preceding flindersi. 
Shell similar but a little more flattened, of same coloration, 
sculpture a little fainter, umbilicus nearly closed 
petum. 
Shell still elevated, of different coloration, dull brown, paler 
around umbilicus, umbilicus nearly closed, sculpture 
Irregular aversum- 
