266 
tliree or four strong diverging ridges. The second species is highly cancellate, the 
radiating costas being fine, close, and round. Tlie third shell is very small, and indicates 
a triangular species very narrow towards the umbones, and widening ventrally. No 
ornament is preserved, and only one of the anterior ears, which is triangidar and deeply 
divided from the body of the shell. The whole of these points are such common 
characters amongst this group of shells, that they cannot be alone used for specific 
difEerentiation. 
Mr. Rands has collected from Banana Creek, near Eockhamptoii, what is obviously 
another fragment of an Aviciilopeclen. It is a fragment without ears or hinge-line, 
covered with fine, elevated, radiating stria?, slightly curved towards the sides of the shell, 
and with an intermediate rib between each pair ; the whole are crossed by equidistant 
regular concentric lines, forming, by their intersections, small quadrangular spaces. 
AviCTTLOPECTEIf SUBQUIirQUELUVEATCS, McCoy, Sp. 
Pcctcn coinxitus, Dana (lum McCoy), American Journ. Sci., 1847, iv., p. 160. 
,, subquinquelinealus, MeCny, Ann. and Mag. Nat. Hist., 1847, xx., p. 298, t. 17, f. I-- 
,, comptus, Dana, Geology Wilkes’ U. S. Explor. Exped., 1849, Vol. x., p. 704, Atlas, t. 9, f. 5. 
„ suhquinquelincatus, McCoy, Proc. R. Soc. V. D. Land, 18.51, i., p. 322, t. 17, f. 1. 
Aviculopecten subquinquelineatus, DeKoninck, Eoss. Pal. Nouv.-Galles du Sud, 1877, Pt. 3, p. 295, t. 22, f. 2 
,, „ Etheridge fil., Proc. R. Phys. Soc. Edinb., 1880, v., p. 297, t. 15, f. .52. 
Obs. This is a large, strong, and distinctly marked species, at first sight 
resembling A. Fiftoni, Morris,* but easily distinguishable from it by the plain and entire 
condition of the radiating cost® ; whereas in A. Fittoni the latter are composed of a 
series of smaller radii. In both species the valleys between the ribs are filled with 
subordinate eostm. In Morris’s species there is only one between each pair of ribs, but 
in McCoy’s there are from three to five. In A. suhqiiinquelineatus the ears are large 
and radiately striated, and the whole shell must have grown to some considerable size. 
It appears Professor Dana’s name of P. comptus ha,s precedence of McCoy’s by a short 
time, and would be the accepted one for this species, were it not that the name comptus 
had already been used by Professor McCoy f for an Irish Carboniferous I.imestone shell. 
Professor Dana’s name has therefore to give way to the subsequently described 
P, stihquinpuelineatus. 
Loc. and Horizon. Bowen Eiver, at No. 25 Traverse Station (R. L. Jachy, iu 
a hard flinty micaceous sandstone of the Middle or Marine Series, Bowen Eiver 
Coal Pield. 
Aviculopecten lima;foiimis, Morris, ? PI. 14i, fig. 1. 
Pcctcn Unueformia, Morris in Strzelecki’s Phy.s. Descrip. N. S. Wales, &c., 1845, p. 277, t. 13, f. 1. 
Aviculopecten limaifm'uiis, De Koiiinck, Eoss. Pal. Nouv.-Galles du Sud, 1877, Pt. 3, i). 291, t. 22, f. 4. 
„ sp. ind., Etheridge fil., Proc. R. Phys. Soo. Edinb., 1880, v., p. 298. 
Ohs. A single specimen of a largo species of Aviculopecten, with portions of the 
valves in apposition, has been obtained by my Colleague. It is a mere cast with remains 
of shelly matter here aud there, but appears to correspond to a great extent with A- 
limwformis, Morris.J The sheE is very inequivalve, one valve being moderately convex, 
the other almost flat, or even, towards the ventral margin, a little concave. These 
characters would accord better with those of the species mentioned, than with any other 
of the Australian forms so far as described to the present time. In the Daintree 
Collection, Mr. Etlieridgo determined the ])resonco of this shell and gave the following 
* Strzelecki's Phys. Descrip. N. S. Wales, &c., 1845, t. 14, f. 2. 
t Synop. Garb. Limest. Eoss. Ireland, 1844, p. 90, 1. 15, f. 14. 
t Strzelecki’s Phys. Deacrip. N. S. Wales, &c., 1845, p. 277, t. 13, fig. 1. 
