2S. 
LAND SHELIA 
S.A. NAT., 
YOL. XVIll. No. 2. 
Echonitor albumenoideus. PL I, fig. 17. 
1868. Helix albumenoidea Cox, Mon. Austr. Land Shells, p.ll, 
pL XII, fig. 2, May. Flinders Range, South Australia, 
Type in Australian Museum. 
The original specimen is still available, and the figure and 
description are quite good. The milky appearance may not be 
normal, but it is smaller than the other named Australian species, 
and under a strong lens the earlier whorls show a faint regulai 
concentric lining. 
Echonitor waterhousei. 
1868. Helix zi/aterhousei Cox, Mon. Austr. Land Shells, p.3, 
pi. XIX, figs. 6, 6a, May, from a painting of the type 
by Angas, new name for 
1864. Helix (Thalassia) subangulata Angas, Proc. Zool. Soc. 
(Lond.) 1863, p.S21, April 20 1864, ex A. Adams and 
Angas MS. South Australia. 
Not Helix subangulata Pfeiffer P.Z.S. 1854, p.S3, Jan. 10, 
1855. 
The figure of the type shows a subangulate shell and this 
has not since been noted in South Australia so the record may 
be incorrect. 
Genus Periclocystis nov. 
Type P. ardeni nov. PI. II, fig. 13. 
Lmder the name ^^Stenopus suba?igidatus Ad. & Ang.’’ I find 
masquerading a shell quite unlike the description and figure of 
Adams and Angas^s species. It is quite unlike any other Micro- 
cystid, as, when adult, the outer lip has the edges thickened, and 
the columella thickened but not reflected, especially with the 
mouth descending. Similar shells are named ‘‘ardeni Brazier,” 
but that name has never been published before. 
Shell small, of few whorls, dull, greyish, flattened, .sculpture 
of rather coarse growth lines, umbilicus open, narrow, mouth 
descending, somewhat oblique, edges thickened, columella very 
small, thick, not reflected. 
The sutures are shallow, the whorls slightly convex, the 
periphery does shovv^ a subangulation, the under surface also 
little convex: the apical whorls showing a faint concentric lining 
v/hich soon disappears. The type is from Blinman and measures: 
major diameter 8 mm., minor diameter 7 mm., height 3.5 mm. 
