268 
to one of the Aviculidso. The umhonal region is certainly not complete ; and, 
therefore, no true conclusion can be arrived at relative to the nature of the ears and 
hinge-line of the perfect shell. {Etheridge.) 
Loc. and Horizon. G-ympie {The late R. Baintree ) — Gympie Beds. 
Atictjlopecten MUiTiEADiATrs, Etheridge. 
Avioulopecten muUiradiatus, Etheridge, Quart. Journ. Geol. Soc., 1872, xxviii., p. 327, t. 13, f. 1. 
Sp. Char. Shell nearly equilateral, orbicular, depressed, slightly convex, with 
about sixty well-defined equidistant sharp ribs, all meeting at the umbo ; these ribs 
appear to have been sharply elevated and plain; ears not seen; lines of growth well 
defined. {Etheridge.) 
Ohs. Avioulopecten miiltiradiatu.’i was compared hy Mr. Etheridge to A. plano- 
radiatus, McCoy, and A. doeens, McCoy, both species of the British Carboniferous 
Limestone. It differs from the first in being less convex, but appears to be a more 
robust shell than the latter. The Author likewise added — “ It has also affinity with 
Peoten sguamiiliferiis, Morris, from Mount AYellington, Van Diemen’s Land. * * * § I 
cannot, however, clearly determine the presence of imbricated scales upon the ribs.” 
Unfortunately, in the figure accompanying these remarks, the indications of scales on 
the ribs are distinctly visible, and it is exceedingly probable that the shell is only, after 
all, Avioulopecten sguanmliferns, Morris. 
Loo. and Horizon. Gympie {The late R. Baintree) — Gj’mpie Beds. An 
Aviculopecten like this species also occurs at Kooingal {The late James Smith ) — 
Gympie Beds. 
Avioulopecten Lauriknti, sp. nov., PI. 43, figs. 3 and 4. 
Sp. Char. Shell small, orbicular, sub-equilateral, anterior, posterior and ventral 
margins rounded ; umbones small, moderately acute. Eight valve hardly convex, much 
flattened ; anterior ear elongately triangular, narrow, separated by a long, deep, and 
narrow byssal sinus ; posterior ear small, more or less rectangular ; surface smooth, or 
with a few concentric growth-marks ; ears apparently smooth. Left valve slightly convex, 
with a straight hinge-line, rather less than the width of the shell, squarish ; anterior ear 
small, triangular, posterior small but wing-like ; anterior ear and body of the valve 
covered with a large number of very fine I’adiating costa! and interpolated riblets, crossed 
by equally fine concentric decussating laminae, and especially well marked on the anterior 
ear. 
Ohs. It is impossible to admit the shell De Koninck has called Avioulopecten 
depilisA to McCoy’s species of the same name. It is probable that the present shell is that 
referred to by the former under that designation. In A. depilis, McCoy, J the anterior 
ear of the right valve is squarish, not particularly elongated, and but little separated 
from the shell. In the jmesent species it is quite the opposite of this. Had these 
characters been applicable to the left, instead of the right valves, a very close resemblance 
would have existed between the fossils now before me and A. variabilis, McCoy. § On 
the whole I think it will be better to separate them under the above name rather than 
admit a doubtful reference to a little known European species. I name this in memory 
of Prof. L. G. De Koninck. 
* Strzelecki’s Phys. Eescrip. N. S. Wales, &c., 1845, p. 278, 1. 14, £. 1. 
t Eoss. Pal. Nouv.-Galles du Sud, 1877, Pt. 3, t. 22, f. 7. 
X Synop. Garb. Limest. Foss. Ireland, 1844, t. 16, f. 11. 
§ lUd., t. 1, f. 7. 
