
662 RECORDS OF THE S.A. MUSEUM 
later forming an abrupt angle with the convex ventral margin; hinge teeth 
striations about six on each of the two teeth. The shell is grey in the Adelaidean 
fossils with a silver-coloured nacre preserved within, Height 25 mm. diameter 
26 mm. 
Loc.: Abattoirs Bore, holotype, Adelaidean. 
Remarks: This species is related to the Recent N. bednalli Verco, but it is 
smaller and has finer lamellae on the radial ribs. It is less like deulicostata 
McCoy 1886 from Beaumaris—(Mordialloc) type locality of the ‘‘Chelten- 
hamian.’”? Eotrigonia with its discrepant ornament of the Mesozoic species is 
represented by the genotype Hotrigonia semiundulata Jenkins in the Miocene 
beneath the Adelaidean of the Adelaide Plains, 
CUNA APOREMA sp, nov. 
Plate xx, fig. 7-8. 
Shell rather thick, subtrigonal, sides slightly convex, umbonal angle rather 
less than a right angle; prodissoconch minute and indistinct; cardinal and lateral 
teeth well developed; ventral border widely rounded, smooth, not crennlated or 
denticulated within or without, no radial sculpture, but there are coarse con- 
centric, irregular incremental imbrications interspersed with microscopic incre- 
mental striae, Height 5 mm., diameter 4-25 mm. 
Loc. : Bore 41, 405-407 feet, holotype, Adclaidean. 
Remarks: This species is plentiful in the Adelaidean, The living species 
Cuna solida Cotton 1931. is somewhat similar in shape, but in no other respect, 
while the general features, smooth ventral margin and concentric sculpture recall 
the minute Cuna cessens Vereo 1908, Of the Tertiary species, Cuna polita Tate 
1887, from Mnddy Creek, Lower Beds, is somewhat similar in shape, but 
(!, aporema differs in its coarser sculpture and larger size. 
BvorRAgsATeELLA CAMURA (Pritchard), 
Plate xx, figs. 15, 16. 
Crassatellites camurus Pritchard 1903. Proe. Roy. Soe. Vict., 15 (2), 96, pl. 14, 
figs. 5, 9. 
The shell found commonly in the Adelaidean is note quite like the Kalimnan 
species or the Miocene oblonga Tenison Woods 1876 from Table Cape. A specimen 
from the Abattoirs Bore is figured here. Height 45 mm,, diameter 70 mm. It will 
be further studied when a more extensive series is available. 
