12 
N. W. ARCHBOLD 
Superfamily Reticulariacea Waagen, 1883 
Family Elythidae Fredericks, 1924 
Subfamily Elythinae Fredericks, 1924 
Genus Spirelytha Fredericks, 1924 
Type species. Spirelytha pavlovae Archbold & Thomas, 
1984. 
Spirelytha cf. fredericksi Archbold & Thomas, 
1984. 
Phricodothyris sp. nov.—Dickins 1976: 99. 
Spirelytha sp. cf. S. fredericksi Archbold & Thomas 
1984: 322, fig. 4S-W. 
Comments. The review of Western Australian 
representatives of the Elythidae by Archbold & 
Thomas (1984a) re-established Spirelytha in 
modern terms. Two specimens from Scott Bluff 
were figured in that study (CPC 24225, an 
internal mould of a complete shell collected by 
W. J. Koop, and CPC 24227, an incomplete 
natural cast of a ventral valve collected by the 
1975 BMR field parties). The specimens were 
noted by Archbold & Thomas (1984a: 323) to be 
closest in morphological details to their S. fred¬ 
ericksi but to differ from that species in possess¬ 
ing a more strongly developed sulcus and fold, 
and in the presence of minute dorsal adminicula 
(the latter considered to be of infraspecific 
importance). 
Since the Western Australian study, Klets 
(1987) has investigated Spirelytha from the 
Southern Verkhoyan. USSR and has identified 
S. fredericksi among his species. The Early Per¬ 
mian Verkhoyan species from the Sigskaya Suite 
is comparable to true S. fredericksi and lacks the 
more strongly developed sulcus and fold of the 
present material. 
ACKNOWLEDGEMENTS 
Dr J. M. Dickins, Bureau of Mineral Resources, 
Geology and Geophysics, is thanked for the loan 
of specimens and the provision of locality data. 
Mrs I. Munro typed the manuscript. A Royal 
Society of Victoria Study Grant assisted with the 
costs of photography and the work was sup¬ 
ported by the Australian Research Grants 
Scheme. 
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