227 
Dielasma, ? sp. ind., PL 40, figs. 1 and 2. 
Ols. This very remarkable form resembles an nnnamed shell figured by Dana * 
in the general form and proportion of its valves. The shell is long-oval, with much 
compressed valves, the ventral very slightly convex, the dorsal nearly flat immediately 
below the umbone, becoming more or less concave towards the front ; the valve margins 
lire not in any way sinuous, but simply gradually curved. 
It certainly cannot be referred to D. cpmhmformis, but corresponds, so far as mere 
outline is concerned, with D.gillen^emis, Davidson, f but the difference in size is remark- 
able, and the valves of the present Brachiopod are narrower forwards. Another of 
Dana’s species, Z>. amygdala, % although again smaller in size, has a very depressed 
dorsal valve, and is to some extent like it. 
It is even questionable whether it be correctly referred to Dielasma, as the 
surface of the ventral valve shows signs of a long septum. It is a very puzzling form, 
and would appear to resemble some of the Devonian Terebratulidao rather than those of 
uigher Palmozoic rocks. 
Loc. and Horizon. Bockhampton District 5 (O. W. De Vis: Colin. De Vis) — 
Grympie Beds. 
Family— SPIEIF ERID^E. 
Gemis—SPIBIFERA, J. Sowerly, 1816. 
(Min. Con., ii., p. 41.) 
Ohs. No more difficult group exists in the Australian Permo-Carboniferous 
Series than the Spirifcrs. So many species have been made on fragments, and the 
presence of European species so frequently determined on indifferent specimens, that it 
has become almost imp)ossible to establish with certainty what species do exist. I hope, 
however, to unravel this confusion when the study of the large series of Nevv South 
Wales specimens is undertaken. In the meantime the following determinations must 
e accepted as a temporary solution of the Queensland species, although I am anything 
hut satisfied with it. 
Spieifeea stjjiata, Martin, sp., ? PI. 9, fig. 16. 
^pirifera striata (Martin), Davidson, Mon. Brit. Garb. Braoh., 1857, Pt. 1, pp. 19 and 240, t. 2, ff. 12-21. 
’■ ,, Etheridge, Quart. Journ. Geol. Soc., 1872, xxviii., p. 334, t. 17, f. 5. 
Ohs. The mesial fold is not so well defined as in the typical S. striata, and some 
ransverse forms of S. hisulcata assume this shape. We may, however, confidently refer 
^ to the above shell, or one of its many varieties. 
to most variable and widely distributed species of the genus Spirifera appears 
^ he not uncommon, as I have been given to understand that individuals of the species 
abundant in the Bowen River Series. {Etheridge.') 
Without for a moment venturing to deny that this may be Spirifera striata, it 
the same iime appears exceedingly doubtful. The ribs are much too few in 
to <^0 not possess the angular sharp outline of S. striata, and the sulcus seems 
e quite plain. The specimen was evidently a very imperfect one, and the cardinal 
s 68 may have been either acute or rounded. It is, in fact, impossible to say what 
* Geology Wilkes’ U. S. Explor. Exped., Atlas, t. 1, f. 4rf. 
t Mon. Brit. Garb. Brach., 1857, Pt. 1, t. 1, f. 18-20, 
J Dana, loc. cit., t. 1, f. 2d. 
§_(Scenote, p. 199 
