A Review of the Land Mollusca of Western Australia. 
53 
subgroups appear there. Sliells small for the family, .subglobose. more or 
less openly umbilieate, no definite seuliiture, longitudinal growth ridges over- 
ridden by granulation, mouth subcircular, open, the columella thickened and 
reflected. 
Sinumelon nullarboricum Tate 1879. 
Plate 111., lig. 19. 
1879 — Helix imMarbanca Tate, Trans. Proe. Phil. Hoc. Adelaide, South Austr., 
1878-9, p. 133, pi. VI., ff. 1 a-b, ex p. 126, worn niid. Bunda Plateau, 
Nullarbor Plain, South Australia. 
Shells from Eucla agree in detail with ])araty[)es of Tate’s species. These 
are subglobose, dirty white, sculjitured with rough radials, spire a little 
elevated, umbilicus narrow, columella thickened, outer liji thickened. 
The two apical whorls are .smooth and shining, but show under a lens 
very fine radials towards the suture. The rude irregular radials show dents 
on the last whorl, which ajipear conci'iitrically as if they were broken rough 
incised lines, but line incised concentric lines may bo seen on the base of some 
specimens subordinate to the denting. The columella is reflected, almost con- 
cealing umbilicus, which is encircled by a ridge. 
Height 14 mm., breadth 16 mm. 
Sinumelon datum sp. nov. 
Plate 111., lig. 18. 
1895 — Uelix angasiana Hedley, Proe. Malac. Soc. (Lond.) Vol. I., ji. 260, 
July. Eucla, Western Australia. 
Not Sinumelon godfreiji Iredale, Rec. Austr. Mus., Vol. XIX, p. 52, 
Aug. 2, 1933, new name for Helix angasiana Pfeiffer, Journ. de 
Conch., Vol. X., p. 228, pi. X., fig. 2, July 1, 1862: near Lake 
Torrens, South Australia. 
Shell subglobose, broader than nullarboricum, with the spire less 
elevated, the sutures deeper, the umbilicus wider and more open, the columella 
more curved and refbuled, the outer lij) reflected but not thickened. Colora- 
tion dirty white. 
The one and a half a))ical whorls have more prominent radial sculpture 
easily seen with a lens, the adult sculpture being rough radials with granu- 
lose subordinate sculpture, the grains lengthening on the last whorl into 
broken radials. The dents are less marked and even more concentrically 
.arranged. Breadth, 19 mm.; height 14 mm. Type from Eucla. Shell from 
kladura larger and broader but obviousl.v conspecific. 
Sinumelon kalgum sp. nov. 
Plate ITT., fig. 25. 
From Hannans, Kalgoorlie and Lake Kalgoorlie dead shells (which 
were probably coloured in life) appear to be relations of Ihe fodinale series. 
They arc stouter than datum, and have not the deep sutures of that species, 
and the sculpture differs. The shell is subglobose, stout, spire short, sutures 
impressed but not subcanaliculate as appear those of datum. The apical 
whorls are not so markedl.v striate, while the radials are finer and the deli- 
cate granulation present never becomes radial, and there appear to be no 
■signs of coneentrie striae nor any denting. The mouth is more vertical and 
