S.A. NAT., 
VOL. XVIII, No. 2. 
By TOM IREDALE. 
17. 
Genus Arborcinea. 
1937. Arborcinea Ircdale, Austr. ZooL, Vol. VIII, p.308, Mch. 12. 
Orthotype Succinea eucalypti Cox. 
The short spire, swollen body and arboreal habit suggested 
the differentiation of this group, which also seals its aperture with 
an epiphragm. The anatomical changes must be important in 
such a difference in living, the normal Succineoid groups being 
moisture loving. Examination of the shell reveals a bold sculp- 
ture, but also shows a thickened truncate columella. 
Arborcinea arborea. PI. I, fig. 2S. 
.1864. Succinea arborea Angas, Proc. Zook Soc. (Lond.) 1863, 
p.523, April 20 1864, ex A. Adams and Angas MS. 
Burniside; Hills near Adelaide, South Australia. 
Figd. Cox, Mon, Austr, Land Shells, p.89, pi. XX, fig, 20, 
May 1868, (from a painting of the type by Angas). 
A small species “shelters Itself beneath the loose bark of the 
FAicalypti,’’ 
Family Bothriembryontidae. 
A family of Bulimid shells characteristic of the Leeuwinian 
Area, only three stragglers occurring in the Centralian Area, one 
in the interior and the other two along the south coast. A fourth 
penetrates into the extreme limit of the South Australian area 
westward. The interior form has the apex with spaced subvertical 
wrinkles and has been separated subgenerically from the typical 
lorms which have the apex regularly pitted. The extraordinary 
development of this form of molluscan life in the extreme South- 
AVest corner of Australia is one of the most striking features of 
molluscan life, and the occurrence of these outliers in Centralia 
and South Australia is intriguing. 
Shell elongate oval, spire tapering, about length of mouth, 
w'idth a little more than half the length, mouth oval, outer lip 
thin, umbilicus a mere chink or closed, columella thickened and 
reflected, coloration varied, sculpture usually very weak radials 
or granules. 
Genus Bothriembryon. 
1894. Bothriembryon Pilsbry, Nautilus, Vol. VHI, p.36, July 
(new name for West Australian Liparus). 
Ortliotype Bulimus melo Quoy and Gaimard. 
3861. Liparus Martens, Die Heliceen, (Albers), 2nd ed., p.229, 
Orthotype Bulimus inflatus Lamarck. 
Not Liparus Albers, Die Heliceen, 1st ed., p.l72, Aug. 
1850. 
