24 . 
LAND SHELL'S. 
S.A. NAT.. 
VOL. XVIII, No. 2. 
Key to Genera. 
Shell with spire roundly elevated, umbilicus scarcely open, 
apex smooth, sculpture medium Elsothera, 
Shell with spire planate, umbilicus very wide, apex large, 
apparently smooth, sculpture fine. Discocharopa. 
Shell with spire planate, umbilicus very wide, apex very 
large, concentrically boldly striate, sculpture fine. 
Roblinella. 
Shell with spire concave, umbilicus narrow, deep, apex almost 
smooth (obsoletely concentrically striate) sculpture 
fine Pillomena, 
Genus Elsothera. 
1933. Elsothera Iredale, Rec. Austr. Mus., Vol. XIX, p.53, 
Aug. 2. ^ ^ 
Orthotype Helve sericatula Pfeiffer. 
The type has the umbilicus almost closed, and the sculpture 
!S fine, the form of the shell a subglobose discoidal. The South 
Australian forms have generally the umbilicus more open, and 
sometimes the sculpture a little bolder, but they appear congen- 
eric, the apex apparently smooth. 
Key to Species. 
Shell flattened globose, discoidal, umbilicus well marked but 
not wide, the sculpture rather bold on the earlier 
whorls murrayana. 
Shell flattened, of similar form but the sculpture much finer 
and regular, umbilicus narrower; major diameter 
5.5 mm., minor diameter 4.75 mm., height 3 mm. 
7iesa?ia. 
Shell a little more elevated, umbilicus, narrow, the sculpture 
regular reteporoides, 
Elsothera murrayana. 
1864. Helix murrayana Pfeiffer, Proc. Zool. Soc. (Lond.), 1863, 
p.527, (ex Angas, p.521, n.n.) April 20 1864: Murray 
Cliffs, South Australia (Angas). 
1868. Helix murrayana Cox, Mon. Austr. Land Shells, p.l4, pi. 
XIX, fig. 10, May 6, from a painting of the type by 
Angas. 
There are probably more species of these small snails as 
the few specimens available show differences but are not sufficient 
for complete diagnosis. 
The Port Lincoln shells have the umbilicus narrower, and 
with the sculpture fine and regular, and thus recall inusta as 
much as murrayana and are here called nesa^ia. PI. I, fig. 14. 
