18 
Loc . — Momha Him, Darling River {JV. Hogarth)-, Avell, north of 
jMilpnrinka, North-West N. S. Wales, at a depth of one Imndred and fifty 
feet {It. ton Lendenf eld) ; well, eight miles east of Milparinka, in the same 
district {JVarden J. L. King) ; Yandamah Creek, Co. E\"elyn, North-AYcst 
N. S. Wales {A. Lang). 
Ilor . — LoAver Cretaceous. 
TjOc. — Y lute Cliffs ()})al Eield {I. G. do V. Gipps^wd A. Mi/lchreesf). 
Hor . — Upper Cretaceous (White Cliffs Opal Series). 
Colin . — Mining and Geological Museum, Sydney; and Macleay 
Museum, University of Sydney. 
Maccoyella eeflecta, Moore, sp. 
(PI. I, Figs. 1-5 ; PI. n, Fig. 1-2 ; PL III, Figs. 1-3 ; PI. IV, Fig. 2.) 
Avicula rejlecta, Moore, Quart. Journ. Geol. Soc., 1870, XXVI, p. 21G, t. 12, f. 1. 
Avicula rejlecta , EtL. fil.. Cat. Austr. Foss., 1878, p. 107. 
Avicula Barklyi, vel. rejlecta, var. Gilliatli, Ten. Woods, Proc. Linn. Soc. N. S. Wales, 
1883, VIII, Pt. 2, p. 210, t. 12, f. 4 and 5 (excl f. G). 
Maccoyella rejlecta, Eth. fil., Geol. Pal. Q’land, &c., 1892, p. 457, t. 23, f. 1-3, 5-7. 
Maccoyella rejlecta, var. Gilliatli, Eth. fil., Loc. dt., t. 23, £. lO.j 
Sp. Char. — Shell large, transversely oval, inequilateral ; valves plano- 
convex, or at times concavo-convex, compressed more or less ; cardinal 
margins long. Right valve either Hat, slightly ' con caA^e, or slightly convex 
in the nmhonal region, hccoming concave or fiat toAA^ards the ventral margin ; 
anterior cardinal margin hut slightly inclined obliquely, and the posterior 
cardinal Anargin straight. Anterior })osterior and A'entral margins regularly 
rounded ; posterior alation more or less flattened, large ; umho A^ery small, 
de])ressed, and nucleus-like. Area very narroAV on the anterior, hut hroad 
and longer on the 2)osterior side ; chondrophoral button strongly developed, 
Avith Avell-marked resilinm furroAA S, a sharp V-sha2)ed chondrophoral socket 
and equally Avell-marked chondrophoral dental processes ; ossiculum rih-like 
and strong ; hepatic fossa transversely elongate ; chondrojAhore shoe-horn 
shajied, Avith resilium furroAVs; hyssal sinus Avide and deep. Adductor 
imju’ession suhcentral and oval, concentrically lined. 
