A Review of the Land Mollusca of Western Atjstkalia. 
13 
mouth, imperforate, texture very thin, the outer lip fragile, sculpture of rude 
growth radials, soiiietiines with line subordinate lining. 
Austrosuccinea scalarina Pfeiffer 1861. 
Plate I., fig. 11. 
1861 — Succinea scalarina Pfeiffer, Proc. Zool. Soc. (Lond.), 1861, p. 28, 
May 1. King George’s Round, South-M'e.st Australia. Pig’d. Cox, 
Mon. Austr. I.and Shells, p. 80, pi. XX, tig. 19, May, 1868, from a 
painting of the type by Angas. 
“Shell ovately conical, sealarine, rather solid, irregularly rugosely 
plicated, slightly .shining, reddish; spire elongated, rather acute; whorls 
convex, last slightly exceeding the spir<‘, somewhat attenuated at the base; 
columella receding', nearly straight, forming with the peristome an indistinct 
angle; aperture oblique, oval, scarcely angular ahove, peristome simple, 
colnmellar margin slightly rellected above.’’ 
Such is the description of a Succinea, and is here reproduced as a 
standard. The shell is reddish when alive but commonly fades to horny, the 
solidity is usually missiTig, thin and fragile better describing the species; 
length 15 mni. ; breadth 7.5 mm. ; length of aperture 9 mm. 
Austrosuccinea contenta sp. nov. 
Plato I., tigs. 12 and 13. 
1813 — Succinea nblonga “Dr.” Menke, Moll. Xov. lloll. Spec., p. 6 (Apl. 11), 
nom, nud., in cracks of limestone rocks not far from the sea near 
Perth. 
1844 — Succinea ohlongu IMenke, Zeitschr. fiir. Malak. (Menke), 1884, p. 
56, Apl. 10. New Holland specimens described. 
Not Succinea ohlonga Draparnaud, Tab. Moll. Prance, p. 56, 1801. 
Probably there are many si)ecies in the Perth district, but obviously 
Menke’s name was used for the common one. 
This has a short spire with a rather swollen body whorl, the spire shorter 
than that of scalarina and the body whorl a little broader; the .shell is not 
so rugose, the early whorls being much smoother, the inner lip is a little 
thickened and a slight body glaze connects with the outer lip. The length of 
the type is 11 mm., the breadth 7 mm., the length of the aperture 8 mm. 
Specimens from Rottnest Island app)ear to differ in their narrower 
form, less swollen body whorl, longer spire and may represent a distinct 
subspecies, A. contenta isolata .subsp. nov., but this will be more fully 
discussed later. The type measures 11 mm. in length, 6 mm. in breadth and 
the aperture 6.5 mm. in length. 
Austrosuccinea caurina sp. nov. 
Plate I., fig. 16. 
1895 — Succinea scalarina Hedley, Proc. Malae. Soc. (Lond.), Vol. I., p. 260, 
July. Pitzroy River, Noi'th-West Australia. 
1898 — Succinea scalarina Anccy, Proc. Linn. Soc. N.S.W., Vol. XXII., 
(189^), p. /7/, June 4. Leunard River, 100 miles inland from 
Derby, North-West Australia (W. W. Proggatt). 
This north-western species which has been confused with the south- 
western one has a general superficial resemblance to that, but is smaller, nar- 
