73 
Eiirydesma cordatum varies chiefly in the form of the antero-ventral 
and ventral extension of the valves. In some instances the antero-ventral 
extension is conspicuous, in others the ventral predominates; in others again, 
a combination of the two conditions is present, or an anterior is to all intents 
and purposes absent. In the two valves shown in Morris’ lower figures there 
is a distinct anterior projection — this is an unusual condition, and is shown 
in one of our specimens. In a few instances the anterior and ventral margins 
are regularly rounded, whilst a more or less compressed extension occurs 
posteriorly. 
The characters of the urahones are faiily constant, in some examples 
they appear to touch, in others they are hut little se])arated, and in only one 
instance are they far apart. 
Details of the articidus are given on p. 52, and of the muscular scars 
on p. 58. 
Radial sculpturing is seen on very few specimens. 
IVe have provisionally placed Freeh’s first figures (1901) of 
Leioniyalina antarctica as a synonym of E. cor datum, and we also sujiport 
Boehm’s contention^ that Freeh’s 1901 figure represents a shell distinct from 
the same author’s 1902 figures — at the same time expressing uncertainty as 
to the generic identity of the first-mentioned shell. 
Localities. — Allandale, railway, and road cuttings ( C. Cnlleu, fV. S. 
Dun, T. W. E. David)-, Harper’s Hill ((7. Cullen)-, Mount View, Cessnock 
{C. Cullen, W. S. Dun, A. Richler) ; Grass-tree Hill, County Dm ham 
(C. Cullen)’, Portion 8, Parish Stanford, County Durham, {W. S. Dun)-, 
Portion 32, Parish Koree {T. McDonough)-, M.l^. 1, Parish Koree (.7. E. 
Carne), and three miles from Wauchope, County Macquarie (C. Laseron) ; 
head of Clarence River, below Rivertree {E. C. Andrews) ; Hastings River 
J. Grade)-, Kempsey District [A. E. liudder); Parishes IVilli IVilli, 
Warbro, and Parrahel, County Dudley (C. Cullen) — Permo-Carhoniferous, 
Lower Marine Series. IVillangi, near Broad Sound, Queensland (T. TE. E. 
David) ; Gatton, Queensland — Permo-Carhoniferous. Maria Island, 
Tasmania [R. M. Johnston) ; also at Middle Arm Creek, Beaeonsfield, 
Cheshunt {^R. M. dohnston ) — Permo-Carhoniferous, Lower Marine Series. 
Collections. — Mining and Geological Museum, Australian and 
Technological Museums. 
‘ Boehm — Centralblatt. , loc. cit., p. 297. 
