
664 RECORDS OF THE S.A. MUSEUM 
Tate 1886, but the fossil species is closely related to the South Australian Recent 
species cumingi Adams and Angas 1867, the genotype of Divalucina Tredale 1936, 
though differing in the fineness of the seulpture. Divuwrirella. von Martens 1880, 
applied to a small Mauritius shell, D. angulifera, related to Divaricella occidua 
Cotton and Godfrey 1938 from Western and South Australia, has fine seulpture 
and notable lateral teeth not present in Dinalucina. The specimen figured by Tate 
1885, Trans. Roy Soc. S. Aust., pl. 12, fig 3, under the name Lucina dentata Wood 
from North West Bend, Oyster Beds, River Murray, is probably D, entypoma, 
as Tate incorrectly applied this name and L. eburna, Recent West Columbia to 
the fossil described here. Still another name used, but inapplicable, 1s Lucina 
divaricata Linne, originally desevibed as Tellina divaricata Linne from the 
Mediterranean, but later figured by Reeve as Lucina divaricala Linne from “West 
Indies, Cape York, North Australia; Jukes.’’ L, divaricata ts the type of the 
genus Lucinella Monterasato 1883 and dentata Wood is regarded as a synonym, 
The genus is readily separated from Divaricella or Divalucina by the characteristic 
strongly dentate posterior edge. Lueinella divaricaty is included in a recent list 
of British Marine Mollusea as Divarivella divarteata inne, but the British 
authority, R. Winckworth, puts ‘‘Quaerenda*’ before the name and refers to 
Forbes and Hanley’s ‘‘A History of British Mollusea and their Shells’? and to 
Jeffrey's ‘‘ British Conchology,’’ for the record. 
CLEIOTHAERUS ADELAIDENSIS 8p. NOV. 
Plate xx, figs. 28, 24. 
Shell rather solid, inequivalve, inequilateral; right valve deep and aeutely 
keeled; attached by the anterior side which in the holotype is coneave and bears 
the impression of the distinctive sculpture of Proxichione cognata ; umbo anterior, 
subspiral; dorsal and posterior margin conyex ; anterior margin almost straight ; 
sculpture of dense lamellae striae; interior nacreous ; hinge vesilifer submmnbonal, 
shallow; adduetor scars slightly unequal. Height 53 mim., diameter 55 mm. 
Loc.: K. R. Weymouth’s Bore, 450 feet, holotype, Adelaidean, Mines depart- 
ment material. 
Remarks: The species is closely related to the Recent Cleidothaerus albidus 
Lamarek 1819 originally described from Tasmania and common in Southern 
Australia. The fossil species is thinner, has smaller adduetor mussel impressions 
and less developed hinge features, The holotype is a right valve and I have not 
yet seen a left valve. 
A related species was described as Chamostrea crassa Tate 1884 from Table 
Cape, Tasmania, Janjukian, Tate 1886 meitions a specimen from Muddy Creek, 
