A Eeview op the Laxd Mollusca of Westers Australia. 49 
luecnt and glassy. The umbilicus is narrow, deep, only about one eighth the 
width of the base yet the previous whorling may be seen therein. The outer 
lip is reflected all round, though thin, and the columella is little thickened. 
Breadth 1.5..') mm.; height 9.5 mm. 
The costulations are a little stronger than in the coastal shell, the spire 
a little more elevated and the umbilicus a little wider. 
Genus BAUDINELLA Thiele 1931. 
.19,31 — Buudhiella Thiele, Handbuch syst. Weicht., Vol. I., p. (185. Ortho- 
type, Hdi.r haiidinensiH Smith. 
1933 — Gonohnudinia Iredale, Hec. xlusfr. Mus., Vol. XIX, p. 55, Aug. 2. 
Ortholype, lleliic- baudinands Smith. 
Thiele’s Handbuch was not available when I introduced Gonohaudinia^ 
and Thiele’s subordination of his subgenus Bandinella to Augasella is difficult 
to understand. Small, stout, widely umbilicate with contracted mouth, it 
resembles no other Australian shell. 
Shell diseoidal, spire flattened, whorls few, last descending a little, mouth 
small, broader than high, outer li[) thickened and reflected, with a ditch 
behind, umbilicus wide and open, nearly half the width of the base. The 
apex is granulosc of about two whorls, the adult sculpture developing without 
any varix intervening: this consists of stout radial ribs with wide interspaces, 
the ribs running across the upper surface in a .sigmoid manner, then with an 
even curve into the umbilical cavity where twenty-one may be counted on 
the last whorl. Along the upirer part of the last whorl there is a deep 
depression which causes the ecceutrieitj' in the lib development, and this 
deioression appears in the outer lip as a tooth. 
Baudinella baudinensis Smith 1893. 
Plate III., tig. 9. 
1893 — Helix {Gonostoma) httudlnends Smith, The Conchologist, Vol. II., 
p. 97, fig. in text, lleh. 25. Baudin I., Xorth-West Australia (J. J. 
Walker). 
The generic characters are, at ])resent, sufficient to enable the recognition 
of this bizarre little shell, which measures (1 mm. in breadth by 3 mm. in 
height. There is a stout epiphragm tin the aperture of the shells collected 
alive. 
Genus SETOBAUDINIA Tredalo 1933. 
19;i3 — Setohaudinia Iredale, Rec. Austr. ilus., Vol. XIX., p. 55, Aug. 2. 
Orthotype Helix coUInjjii Smith. 
The detailed specilie account following shows that this differs from the 
preceding genus in the essential distinction that the shell is covered with a 
2 iilose jocriostracum. Otherwise it is larger, lacks the chai’acteristie sculiiture, 
and has a more open mouth. It is almost certain that it is not closely related. 
Setohaudinia collingii Smith 1893. 
1893 — Helix {Gonostoma) collingii Smith, The Conchologist, Vol. II., p. 98, 
fig. in text, ilch. 25. Baudin I., Xorth-West Australia (J. J. 
Walkei') . 
As no shells are available in this case, Smith’s account reads: “Shell 
flatly diseoidal, with the spire only very little raised above the body- whorl, 
rather oiienly umbilicated, light browm above, and jiale beneath. When in 
