58 
TO.U IlfEDALE. 
Ironstone Ridge, 25 miles South-East of Yeeda Station, Eitzroy River; (2)’ 
ilount iMarniion; Ci) iloniit Xortli Creek, Napier Range; (4) Lennard River 
Gorge, Xapi(M' K’angc; (5) Harrier ttange Homestead, Xa[)ier Range; and 
(6) Oscar Range, north-east side. 
On tile other hand an account of Has(‘dow’s E.\]iedition has a’ppeared in 
the Transactions of tlie Royal GeogT-iiiiliical Society of Austrahisia, South 
Australian liranch, Vol. XVIIl, pp. 10.5-295, ,Tnly 17, 1918. From Hie route 
tliereon given wo tind that Dr. Hasetlow jiassed through tlie Barker Gorge in 
the middle of tlie Xapier Range, then retraced his steps and went along the 
%ve.stern side northwards to another gaj) where he fornid the limestone caves 
which h(‘ later named 1\ angalinnya Caves. Thus Basedow’s localities are 
(piite distinct Irom those of Froggatl though the general name Barrier or 
Xapier Itange was used by both. All I'h'oggatt’s shells were collected in the 
southern end of the Range and in the Oscar Range which liis some twenty 
miles to the south-east. 
I have continually obseri'cel that our land molluscs mn.st be studied in 
conjunction with geograiihical, geological and climatic conditions. This in- 
stance provides a striking e.xamjile as the variation seen in the two cidh'ctions 
(with the same locality label) was not under.sood until the gi'ograjthy of the 
district was known. In a geological sketch plan which accom|ianies Base- 
dow’s account, the Xapier Range is shown as Devonian limestone, the aiiproach 
from Derby as Permo-Carboniferous, while the Kimberley block to the north- 
■svard ajrpears as Cainbro-Ordoviciau, a pre-Cambria u sector irdervening ju.st 
north of the Xapier Range. A peculiar note is the showing of a .small ]iatch 
of Pcrmo-Garbouiferous to the south-east of Wyndham whence come some 
peculiar snails. With regard to tlu' A'ariation seen in the Xa])i(‘r Range collec- 
tion.s other factors, sindi as climatic, may hav(' interfered as this aspect needs 
consideration. 
Genus EHAGADA Allnu's 1861. 
18()1 — Ithagadd Allnn-K, Die Heliceen, 2nd ed. (IMartens), p. 108, “1860.” 
Drthotyp(‘ I fell. - it'mga Gray = Pfeiffer. 
The restricted gi'oup of true Ehagada comprises small shells, of llattened 
Helicoid aspect, but chalky, rather shining, spire little elevated, sutures ini- 
])ressed, whorls rounded, mouth .subcircular, outer lip thin but a little re- 
flected, inner base showing a slight tubercle, columella curved, apjiressed 
generally closing the umbilicus in the adult, a narrow perforation always 
visible in the juvenile stage. Sculpture of obscure, radials only. Coloration 
white with a few coloured bands. 
Rhagada torulus Eerussac 1819. 
Plato IV., fig. 1. 
1819 — Heli.r toriditfi Eerussac, Hist. Moll. livr. 6, pi. XX VIE, figs, .'i, 1, Xov- 
ember; Syst. Tnbl. Mist. i\Ioll., )>. 34, .Ian. p. 30, .Tune 1821. Xew 
Holland (Peron) = Shark Bay, W.A. 
The oidy locality whence Peron could have secured a shell such as 
Eerussac figured is Shark Bay, and we find that, dealing with the natural 
history of Bernier Island, with which he associated that of Dorre and Dirk 
Hartog’s Isles, he mentioned “two species of land shells extremely numer- 
ous, but all dead, occuiiied great stretches of the interior of the island. One 
was a small species of Helix.” 
