PLATES AND EX !»LA NATIONS. 
Unless otherwise stated to the contrary the figures are of the natural size, and the 
specimens arc in the Mining and Geological Museum, Sydney. 
PIATE 1. 
Fig. 1. 
IMaccoyella reflecta, Moore, sp. 
Kigtit valve exliiliitiug .small umho, l) 3 ^ssal .sinus, chomlrojilioral button, and costa- 
( I'enison Woods’ typo— Froc. Linn. Soc W. JVales, 1883, YIIl, Ft. 2, t. 12, f. 5). 
Fig. 2. 
Interior of f'ig. 1, exliibiting byssal sinus, cliondrojdioral button, posterior pyriform 
cliondrophoro, ossiculum liclow the latter, and adductor impression. 
Mount Stuart linn — Colin. Macleay Museum. 
Fig. 3. 
Young individual, a[i])roaclung in appearance to M. Barkh/i, Moore, sp., but possessing 
the posterior folddike alation of M. reJJectn , also exhibiting pronounced umbo and 
strong costa-. 
Fig. 4. 
Interior of Fig. 3, exhibiting the scohinate lamelhc at the anterior end of the cardinal 
margin. 
Mount Stuart Bun — Colin. Macleay Museum. 
Fig. 5. 
Lenticular shell structure, always seen in sections of the test prepared for the micro- 
scope, or on the interior of a valve when w'eathered or exfoliated. 
Fig. G. 
iMaccoyella corbiensis, Moore, sp. 
Left v.alvc, exhibiting the small posterior alation, produced posterior-ventral end, and 
wide growth lamelhe. 
Yandaminta. 
Fig. 7. 
liight valve, and umbo and cardinal margin of the left valve. 
Mount Poole. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
Left valve, showing characters similar to those of Fig. 0. 
Cardinal margin of Figs. S and 10, and interior of valve. 
Interior of Fig. 8, exhibiting the overhanging umbo, and adductor impression. 
Mount Stuart Run — Colin. Macleay Museum. 
Fig. 11. 
iModioIa Talci, lith. fd. 
Left valve, replaced by common op.al. 
IVhite. — Colin Gi])ps. 
Fig. 12. 
Fig. 13. 
Modiola, sp. 
Fight valve, replaced hy common opal. 
Cardinal margin of Fig. 12. 
White Cl{fls — Colin. Ciipps. 
Fig. 11. 
Serjuila tongowokoensis, L'jh fd. 
Tubes attached to portion of Marcoj/eUa shell. 
Mount Stiiatt Run — Colin, iMacleav iUuscum. 
