A Review of the Land ^[ollusca of Western Australia. 
15 
Genus AEBOKCINEA 1 redale IB.IT. 
1937 — Arbormtea Iredalc, Austr. ZooL, Vol. VIII., p. 308, Mch. 12. Ortho- 
type Sitccinea euc(dnpti Cox. 
The tre(‘ living Suecineids have very different habits from those on the 
ground whieh 1‘reiiuent damp plaee.s, and it has been recently argued that 
field observations must be taken into account in the taxonomic <Usposition of 
our molluscs. T recorded many years ago that on Sunday Island, Kermadee 
Group, th(' tree living snails were altogether unrelated to those living on the 
ground adjacent. In the present series the tree living Suceineids live under 
the bark of the ti'ees and seal themselves to the wood, carrying a thick 
epiiihragm. Normal Suceineids with a large animal live in moist places, and 
many kinds have been sei>arnteil among those alone. The shell features or 
Arborcinea include a short s]iire, swollen body whorl and a rather bold 
sculpture with a truncated thickened columella. 
Arborcinea menkeana Pfeiffer 1850. 
I'latc I., fig. 14. 
1843 — SU'Ccinea nmphib'm “Dr.” Menke, Moll. Nov. Holl. Spec., p. 6, Apl. 
uom. nud. “Under the Bark of Euealypts.” District Hay, West 
Australia. 
1844 — Siiccinra amphibia Menke, Zeitschr. fiir Malak (Menke), 1844, p. 55, 
Apl. 10. Specimens described. 
Not iS'. amphibia Drai'arnaud, Tab. Moll. Prance, p. 55, 1801. 
1850 -Smcc/wcu mmlicatia Pfeiffer, Zeitschr. fur Malak (Menke), 1849, p. 110, 
Jan. 1850, fide t’.D.S. New Holland (L. Preiss) = amphibia 
Menke, i.e., from Hay as above. 
Fig’d. Pfeiffer, Syst. Conch. Cab. (Mart. & Chemn.), ed. Kuster, 
Bd. I., Abth XL. p. 45, pi. 4, fig's. 36, .37, 38. 1855. 
1930 — Surcinaa hrevi.^isimn Thiele, Die Fauna Sudwest Anstraliens, Bd. V., 
lief 8, p. 587, ]il. IV., f. 66. Collie, South-West Australia. 
TIic description indicates the genns thus “Shell ovately-elliptical, thin, 
distinctly striated, pellucid, shining, horny; spire short, papilliform, suture 
deep; whorls 2’','h, the last but one very convex, the last attenuated at the 
base; columella somewhat callous, regularly curved; aperture slightly oblique, 
regularly oval; peristome simple, thin, margins approaching. Length 31/2 
lines; breadth 1^, lines.” 
FAMILY BOTHRIEMBRYONTIDAE. 
Prohahly the most intriguing laud shells in Australia are the bulimoid 
forms inhabiting the South-West corner. A large number of species and 
races has developed, and ]irobably only a tithe has been described. It is un- 
fortunate these have not yet heen studied hy anyone conversant with local 
conditions, and it is certain that ti;ey will provide future students with much 
re.scarch. No more exciting subject could be chosen hy the student, hut the 
unravelling of the many problems will necessitate much investigation. The 
present essay, also hy an outsider, is the re.sult of oi'er a doFum years of eon- 
•sideration, the specimens having been handled from every viewjjoint, gpologi- 
eal data, botanical data, meteorological data and even soil conditions have 
been brought under review. The first S])eeies were described from the collec- 
tions of the French naturalists; a little later similar shells taken hV Britisl 
