6 
Toil I redale. 
roughened, the columella short, straight, the operculum thick, horny. The 
specimens before me ft’orn Baudin Island, presented by the collector J. J. 
Walker, are apiiarontly slightly smaller than the type measured by Smith, 
ivho gives “Diam. ma.j. o, alt. 3.5 mm.”: these are about 4 mm. in breadth 
by 3 mm. in height. 
FAMIl.Y CYCLOPHOEIDAE. 
This family does not occur in Western Australia, though two species 
were described by Benson as having been collected at the Swan Biver by 
Dr. Bacon. As this collector also worked in India it is a]jparent that the 
localities became confused, and the Cyc.lophorids described originated in 
India. The names were Ciiclostoma liricinctum and C. orbiculatmn Benson, 
Ann. Mag. Nat. Hist., Ser. IT. , Vol. XT., ji. lOfi, February, and they were 
figured by Reeve, Conch. Icon. Vol. XI IT., C udoplwrus, Vol. XX., s]i. 100 
and 101, Aug. 1801. They can now be comiiletely dismis.sed fi'om this fauna. 
Subclass PULMONATA. 
This subclass includes all the land snails save those with an operculum, 
and as only one of the latter comes into our review, the remaining members 
of our fauna here follow’. Numerous smaller divisions are utilised in classify- 
ing this large number. 
Order STYLOMMATOPHORA. 
The subclass is separated into twt) Orders, but only one is represented 
in this fauna, but this has been subdivided into many large groups, but as 
thej’ seem somewhat artificial, only the families are here mentioned. 
FAMILY VEETIGINIDAE. 
This familv name wuis previously used for all Australian pupoid shells, 
but as now restricted, no representative is yet known from Western Aus- 
tralia, but as the s])ecies are very small and difficult to find and so little 
searching has yet been done in this land it cannot be definitely stated that 
the family is absolutely absent from the State. 
FAMILY GASTEOCOPTIDAE. 
The minute Pupoid shells of Australia were placed in one family in the 
Basic List, following Pilsbry's IMonograph, but ujion reconsidering the siu'cies 
in connection with the South Australian forms I regretted that action. T 
merely noted my objection in my account, but here allocate the Western Au.s- 
tralian shells in a. more scientific manner. It became (|uile obvious that we 
were dealing with diverse stocks, and then it was seen that Pilsbry himself 
had been dubious of his own action. Steesiberg, a European authority, has 
given an excellent account of the anatomy of these difficult minutiae, and 
separated the l^alaearctic forms into many families. Following this worker, 
the Australian species w’ould be arranged in four families, and this Is much 
nearer the truth. The few Western Australian species then fall into three 
families : 
Shell very small, pupoid, with small mouth with comj)lex armature; 
species dextral or sinistral. 
Ga.stroco))tidae. 
Shell small, but larger than ])reeeding, wdth no armature in mouth save 
a tubercle or base of shell adjacent to outer lip. 
Pu]ioididae. 
