23 
As to the few figures of tliis Aviculopccten hitherto published, we find 
as follow ; — 
1. Amculopecten {?') limaforims, Etheridged — There is every proba- 
bility that the figure of this Queensland cast represents a badly-preserved 
example of this species. 
2. Aviculopecteii limcdformis , De Koninck,^ we have reason to believe 
is not this species, as will he explained later. 
3. Aviciilopecten liimcformis, Johnston,^ we regard as IVforris’ species, 
hut Avith a rather more rounded outline than our figure (PI. XT, Eigs. 1 
and 2) ; it is an illustration of the more coiiA'ex valve. 
4. (.^) Aciculopeclen limceformis, Eth. fil.'^ — The figure given by one 
of us in all probability represents the umbo and anterior auricle of the less 
convex of the two anilves. 
5. Aviculopecten, c.f. Umceformis, Waagen."’ — A fragment of a Salt 
llange pectinoid fossil was so referred by Dr. W. 'Waagen, hut Ave fail to 
trace any relation to the Australian species. 
The valves of A. linucformls are unequal, bi-convex, hut one far more 
convex than the other, the less convex valve becoming more or less concave 
toAvards the ventral margin. The amount of obliquity of the shell A^aries ; it 
is much more marked in some individuals than in others. We find the 
rounded costm to vary from thirty-four to thirty-eight in number, including 
some secondary ribs Avhich are the result of interpolation and not bifurcation ; 
these are crossed by very regular, numerous, and elose-set concentric frills or 
laminations. 
The auricles in all our specimens are defective, hut, judging from 
Morris’ figures, the cardinal margins were not long in comparison to the 
width of the valves, and in consequence the auricles could not have been of 
any great dimensions; on the other hand, in Johnston’s figure, Avhich AA"e arc 
at present prepared to accept as that of this sjsecies, the auricles are of 
* Etheridge — Quart. Jouni. Geol. Soc., 1872, XXA III, p. 32G, t. 14, f. 1. 
’ Ue Koninck — Rech. Foss. Pal. Xouv.-Galle, du Sud, 1877, Pt. 3, p. 153, t. 22, f. 4. 
^ Johnston — Syst. Ace. Gcol. Tas., 1888, t. 14, f. 1. 
* Etheiidge, Junr. — Geol. Pal. Q.’land, &c., 1802, p. 266, t. 14, f. I. 
’ AVaagen — Rec. Gcol. Surrey India, 1886, XIX, p. 27, t. 1, f. 8; Salt Range Foss. (Pal. Ind.), 1901, IV, 
Pt. 2, p. 130, t. 5, f. 8. 
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