12 
Tom Jkbdale. 
Genus OMEGAPILLA Jicdale 193 1 . 
1937 — OmcgapiUa Iredale, Aiistr. ZooL, Vol, p. dOl, March 12. Ortho- 
type Pupa nelsoni Vox. 
Small pupoid shells, dextral or siiiistral, month small, teeth three or four, 
differently arranged from those of other Pupoids, tliough ohxiously correla- 
tive. 
Hedley placed this in the European genius, \ ertigo, while Ihlsbry in- 
cludes it in the Piilaearctic genus, PupUJa, under a section, PrimiptipUlUf 
based on a Caucasian shell, but later discarded this in favour of GiblmUnopaii 
Germain, proposed for an “Eniieid” shell from the Island of Keunion. 
I reiterate my conclusion that the association of southern Australian 
Pupoids with those from Europe and South Africa is basically unsound, and 
should not be recognised by Australian conchologists. 
Omegapilla occidentalis sp. nov. 
Plate I., tig. 10. 
1894 — Papa linvohiensis Smith, Proc. IMalae. Soc. (Loud.), ^’ol. I., p. 961, 
June. Pigeon Island, near Wallaby Island {Dr. Kichardson, in 
British Museum), and East Wallaby Islatul, Houtman's Abrolhos 
(Walker). 
1916 — Vertigo Jincolnensis Hedley, Journ. Roy. Soc. IVest Austr., Vol. 1., 
j). 217 (p. 68 in separate). 
1921 — PupiUa aii.'itndis Pilsbry, Man. Conch. (Tryon), Ser. 2, A^ol. XXVI. 
(pt. 104), p. 218. 
Smith remarked “This species is described (by Cu.x (Mon. Austr. Land 
Shells, jn 80, pi. XV, fig. 16, May, 1868; Port Lincoln, South Australia)], 
as having only a single lootli or tubercle in tlie aperture. The specimens 
collected by Dr. Richardson and Mr. Walker have a soeond biisal tubercle 
as indicated in Cox's tigurc, and a third far within uj)on the columella. It 
is jjossible that in (he examples examined by Dr. Cas the denticles were only 
feebly developed, or they may even have been overlooked, being rather 
indistinct.” 
Many specimens from Rottnost I. arc much smaller than South Austra- 
lian lincolneims or australis, and have the teeth placed much furt'ier back 
and less noticeable, the parietal tooth most pronounced, the columellar one 
smaller and more hidden, the liasal one well inside. 
EAi\IILV SUCCINEIDAE. 
This family is at present allowed a world-wide range, but this is ques- 
tionable, and recent researches into Brifisli forms show distinct groups defin- 
able in that small compact area. 1 have therefore introduced the generic 
name Austrosnccinea for the common southern Australian type as the animal 
has been shown to differ from Ibat of the northern group whose shell is most 
like. For a second peculiar Australian group I have proimsed Arborcinea: 
both these occur in Western Australia but there may bo a third later 
separated. 
Gemis ALTSTROSUCCINEA Iredalc 1937. 
1937 — Austrosaccinea Iredale, Austr. Zook, \ ol. VIII., p. 30t, Meh. 12, 
Orthotype Succiyiea australis Ferussac. 
The waxy appearance and peculiar form make these molluscs recognis- 
able at sight.' Subbulimoid in form with a very .short spire and open oval 
