
660 RECORDS OF THE $,A, MUSEUM 
threadlets occur, increasing in number as the shell grows; umbones subeentral, 
hinge teeth fine, about twelve on either side. Height 19 mm., diameter 20 mm, 
Loc.; Abattoirs Bore, holotype, Adelaidean. 
The species is related to 7’, may? rather than to 7. tenuicostata Reeve, but it 
is rounder and more delicately sculptured than the Tasmanian species. 
TUCHTONA CRAMA Sp. Nov. 
Plate xx, figs. 1, 2. 
Shell solid, orbieular, slightly transverse, inequilateral ; wnbones approximate ; 
radially ribbed; radial ribs narrow interspaces deeply furrowed; squamose 
concentric ornament; ribs numbering twenty-two rather flattened, inner margin 
of valves strongly crenate; cardinal teeth, about eight on each side. Height 
30 mm., length 32 mm. 
Loc, : Abattoirs Bore, holotype, Adelaidean. 
Remarks ; This species has been recorded from the Adelaidean as Glycymerts 
converus Tate 1886, Muddy Creek, Upper Beds Kalimnan (type), Chapman and 
Singleton 1925 under Glycymeris convera Tate, write: ‘‘Shells from the upper 
beds of the Adelaide Tertiary Basin as also in the Abattoirs and other bares, show 
a certain amount of variation from the Muddy Creek, topotypes, the South 
Australian examples being in general more depressed and with distinctly flattened 
ribs. The concentric ornament is also more developed as a series of undulose 
growth lines which cross the quadrately depressed ribs.’’ 
Two Recent South Australian species 7. flabellatus and T. broadfoolae 
resemble the present species which has a tendency to the deep radial interstitial 
furrows of 7’. broadfootae, but it is a much smaller and flatter shell, 
PIncTADA CRASSICARDIA (Tate). 
Meleagrina crassicurdia ate 1886. Trans. Roy. Soc., 5. Aust., 8, 121, pl. 9, 
fies. 9, 10. 
Large fragments of this species are common in tle Adelaidean. The Recent: 
Pinctada carchariariwm Jameson 1901 from Sharks Bay is closely allied and is 
abundant as a raised beach subfossil at Murat Bay, South Australia. Six Recent 
species inhabit Northern Australia. 
CTENAMUSIUM ATKINSONI (Johnston). 
Amusium atkinsoni Johnston 1880, Proe. Roy. Soe, Tas. 29. 
The holotype was deseribed from Table Cape and il is distinet from eitteli 
Hutton 1873 ‘‘Upper Eocene,’ Poyerty Bay, New Zealand, and the Recent 
