17 
MACCOYELLA, Eth. fiL, 1892. 
(freol. Pal. Q'laud, &e., 1S92, p. 4 -j1.) 
Maccoyell.a. Barklyi, Moore, sj). 
(PI. II, Figs. 3-5 ; PI. Ill, Figs. 4 aud 5 ; PI. IV, Figs 3 and 4.) 
Avicula Barkltji, Moore, Quart. Jourii. Geol. Soc., 1870, XXVI, p. 245, t. 11, f. 1 and 2. 
Amcill% alata, Etheridge, Quart. Joiirn. Geol. Soc., 1872, XXVIII, p. 342, t. 20, £. 8. 
Avicula Barklyi, Eth. 111., Cat. Austr. Foss., 1878, p. 107. 
Monotis Barklyi, Tate, Trans. E. Soc. S. Austr. for 1879-80 (1880), III, pp. 101 and 179. 
Avicula Barklyi, Tate, Trans. E. Soc. S. Austr. for 1880-81 (1882), IV, p. 149. 
Monotis Barklyi, Tate, Trans. E. Soc. S. Austr. for 1885-8G (1887), IX, p. 53. 
Avicula Barklyi (pars), Tate, Proc. Austr. Assoc. Adv. Sci. for 1888-89 (1889), I, p. 230. 
MaCCOyellOj Barklyi, Eth. fil , Geol. Pal. Q'laud, &c.. 1892, p. 455, t. 22, f. 1, 2, 4, and 5, t. 
23, f. 1 and 2. 
Maccoyella Barklyi, var. maricelmriensis, Eth. fil., Geol. Pal. Q’land, Ac., 1892, pp. 
456 and 563, t. 22, f. 3, t. 42, f. 4-G. 
Bseudavicula (.'') alata, Eth. fil., Geol. Pal. Q’land, Ac., 1892, p. 503, t. 24, f. 14. 
Ohs . — Three specimens arc amongst the Cretaceous fossils from tlie 
western area of our State in the Mining and Geological Aluseum — one left 
valve and two right. Another small right valve is also in the Macleay 
Museum. The left valve exhibits a well marked double adductor scar, each 
half transversely ridged, and, when the two are united, forming an oblique 
sub-reniform scar. In both the right valves the scars are entire, broadly 
oval, and to some extent concentrically ridged. The smaller of the two 
further shows traces of the line of muscular attachment pits extending from 
the umhonal region to the adductor scar, already figured in an example ^ of 
this species from Alaryhorough, Queensland. 
The Upper Cretaceous of tlie White Cliffs Opal Eield has yielded a 
number of imperfect specimens of this most characteristic sjiecics, one at 
least partially opalised, the others in tlie white or often ferruginous stained 
kaolin of the area in question. The method of jireservation is not conducive 
to the retention of structure, and none of the specimens sliow anatomical 
details other than those already known. 
' (!eol. Pal. Q'land, &c., 189'2, t. 22, f. 4. 
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