
CoTTON—SOME TERTIARY FossIL MOLLuscs 659 
Tucetona Tredale 1981. Genotype, Pectunculus flabellatus Tenison Woods. 
flabellatus (Tenison Woods) 1878; Recent, N.E. Tas. (type) Werrikooian. 
convera (Tate) 1886. Muddy Creek, pper Beds, Kalimnan. 
cramasp. nov. Abattoirs Bore, Adelaidean, 
subtrigonalis (Tate) 1886; Morgan, Janjukian, 
decurrens (Chapman and Singleton) 1925. Grange Burn, Kalimnan. 
Melaxinaea Iredale 1931, Genotype Melazinaea labyrintha Iredale. 
plamiuscula (Chapman and Singleton) 1925, Glenelg River, Werrikooian. 
Grandaxinaead Iredale 1981, Genotype Glycymeris magnificans Lredale, 
macecoyt (Johnston) 1800, Table Cape, Janjukian. 
ormthoptera (Chapman and Singleton) 1925. Torquay, Janjukian. 
gunyoungensis (Chapman and Singleton) 1925, Grice Creek, Baleombian, 
lenticularis (Tate) 1886. Adelaide Bore, Janjukian . , 
grant? (Singleton) 1932. Muddy Creek, Lower Beds, Baleombian. 
Glycymeris australis var. gigantea Chapman 1915, from Vivonne Bay, 
Kanvaroo Island, Werrikooian, belongs to the fanuly Lucinidae as pomted out by 
Singleton, 1941, 
TUCETILLA MAYT sp. nov. 
Plate xx, figs. 18, 19. 
Shell suborbiecular, a little ovate and slightly produeed at the posterior end; 
sculpture of fine anc numerous radial riblets split as the shell grows into grouped 
secondary still finer threadlets; umbones subcentral, hinge teeth delicate, about 
tenon each side. Height 18 mm,, diameter 20 muni, 
Loe.: S.A. Beachport 100 fathoms (holotype), also 200 fathoms, Tas,, Cape 
Pillav 100 fathoms, 40 fathoms. 
Remarks: According to May, 1928, Mlust. Index Tas. Shells, pl. 2, tig. 7, this 
apecies figured under the name Glycymerts lenuicastatus Reeve, from Cape Pillar, 
100 fathoms, grows larger, but, May’s specimens in the South Australian Museum 
are little larger than the South Australian shells, May gave the depth for 
Tasmanian shells as ‘‘40-100 fathonis, not tineommon.’’ The present series is 
more ovate and has finer sculpture than the North Queensland Glycymeris 
tenuicostatus Reeve 1643. The hinge teeth are less well developed than in either 
Reeve’s species or in the fossil species described below, 
TUCETILLA ROTA sp, NOV, 
Plate xx, figs. 3, 4. 
Shell suborbiewlar, rather small, somewhat ventricose; sculpture of fine and 
numerous riblets and between each pair of major riblets secondary still finer 
