56 
Toil Iredale. 
Pleuroxia oligopleura Tate 1894. 
Plate III., %. 28. 
1894— JTatlra oUgopleura Tate, Trans. Roy. Soc. South Aiistr., Vol. XVIII., 
p. 193, Nov. Eyre’s Sand Patch, 160 miles west from Enda, West 
Australia (Adcock). 
IHm—AngaseUa oUgopleura Tate, Rep. Horn. Sci. Exped. Centr. Anstr., pt. 
11., Zool., ]). 219, pi. XIX., fifj. 39, Eeb. “Flinders’ Range, South 
Australia,” error only, through interchange of localities with 
H. trilpenenms only. 
“Similar to II. cry! o pleura (sic) hut the i)lications sharper, higher, and 
about one-third less in number (35 to 40) ; the outer lip is thin, and the whorl 
is more constricted behind it. Diameters, 14.15 and 12; height, 8; height of 
aperture 6 mm.” Topotypes agreed with this diagnosis but shells from 70 
Mile Tank ea.st of Ralladonia are a little larger and flatter, and jirobably 
belong to the same subspecies that occurs on the Hamilton Tableland and at 
Cardanmnbi, west of Eyre. This subspecie.s is altogether larger, more de- 
pressed the last whorl flattened above and rounded below, the iieriphery sub- 
keeled, and the rib sculpture mucli more pronounced and the ribs only about 
thii’ty in number, interstitial granulation obsolete. The coloralion of the 
living shell is brownish white, and the type measures 18 mm. in breadth and 
8.5 mm. in height, the subsjieeies being named Pleuroxia cligopleura numba 
nov. 
Pleuroxia gascoynensis Smith 1894. 
1894 — Helix (Trachia) gavcoijnensis Smith, Proe. Malac. Soc. (Loud.), Vol. 
1., p. 93, pi. \'I1., fig. 13, June. Gascoym- District, Western Aus- 
tralia (II. P. Woodward). 
“Shell depr(>ssed, orbiculai', broadly and openly umbilicated, whitish, 
rather solid; whorls four, convex, sutures deeply impressed, closely and 
minutely granulated, scul])lured with oblique rugae or irregular rugose plicae, 
the two a|)ical smoother, the last whorl rounded or subangulate at the peri- 
phery, descending- consjiicuously in front, the underside rugose; spire flat, 
apex obtuse, a liltl(‘ eh’vated; apertur(> subhoriy.ontal, rounded; [leristome 
continuous, apjiressed to the last whorl, narrowly (>xpanded, the lower margin 
broadly dilated. Diam. maj. 12.5, min. 10 mm.; alt. 5.5 mm. Aiierture 4 high, 
4.5 broad. It is similar in form to II. cyrtopleura , Pfr., from South Aus- 
tralia, but differs in size and sculjiture. It is smaller, flatter, and has the peri- 
stome more decidedly continuous. Rather a ;)owertul lens is necessary to 
observe the fine gramdation which covers the entire surface.” 
Pleuroxia abstans sp. nov. 
Plate III., fig. 22. 
A series labelled “On chalk, Murchison House, Gantlieaume Bay,” con- 
sists of dead shells, smaller than the preceding, the largest being only 10 mm. 
in breadth and barely 5 mm. in height, and having the apex coarsely granu- 
lose. 
Shell small, subdiscoidal, spire, scarcely elevated, .sutures deep, whorls a 
little rounded, last whorl descending in front, umbilicate, umbilicus wide, open, 
mouth oblique, subcircular, chalky white. Apex half whorl strongly granu- 
lated, not differentiated Horn four adult whorls, the granules massing to form 
radial ribs. On the last whorl these ribs are rvell marked closely set ridges. 
