223 
Relations and Differences. — It is not easy to make a comparison 
between this species, of which only an internal cast and a few traces of the 
shell are known, and other species of the same genus. Yet I think it 
resembles P. tricostatus, Portlock, which has the same shape, but three 
instead of two keels. 
Horizon and Localities.— was found in the Wollongong sandstone. 
Pletjuophorus carinatus ?, J. Moi^ris} 
PI. XIX, Pig 8. 
PachydoMUS carinatlis, J. Morris, 1815, In Strzelecki’s Phys. Descr. N. S. Wales and V. 
D. Land, p. 273, pi. 11, fig. 3. 
,, ,, P. McCoy, 1847, Ann. Mag. Nat. His., XX, p. 301. 
Cypricardia rugulosa, .1. D. Dana, 1847, Am. .Tour. Sci., IV (2), p, 157. 
JHceonia ? caidnata. Idem, 1849, G-eol. Wilkes’ IT. S. Exjfior. Exped., p. G9G, pi. G, fig. 1. 
This shell is elongated and subcuneiform, with slightly recurved beaks 
placed towards the anterior third of the total length. An oblique keel 
starting from the beaks, strikes out towards the posterior extremity of the 
the ventral margin, and divides the surface into two very unequal parts. 
Having only an internal cast, and not being able therefore to say positively 
that it belongs to this species, I will not go into further detail, l)ut simply 
refer to PI. XIX, Pig. 8. 
Horizon and Localities. — Mr. McCoy says that P. carinatus is very 
abundant at Wollongong, where the internal cast in question was found. 
Mr. Morris says they occur at Illawarra. 
Gewws— CONOCAEDIUM, H. Rronn. 
CONOCARDIUM AUSTRALE ?, P. McCoy. 
Pleurorynclius australis, P. McCoy, 1847, Ann. Mag. Nat. Hist., XX, p. 300, pi. IG, fig. 4. 
Ca,rdiuin australe, J. D. Dana, 1849, Greol. Wilkes’ U. >S. Explor. Exped., p. 701, pi. 8, fig. 2. 
This is a subtrigonal, gibbous, externally carinated shell. Its anterior 
side is truncated, depressed, and slightly convex. Its anterior surface is 
* \_Mceonia carinatus, R. Etheridge, Jiinr., Geol. and Pal., Q’land., 1892, p. 283. Pachydomns carinatus, 
A. H. Foord, Geol. Mag., 1890, VII (3), p. 154.— W.S.D.] 
