PLATE 10. 
Pig. 1. Spirifera tasmaniensis, Morris ? A decorticated specimen seen from the 
dorsal side, with the cost® much broken up. Bowen River 
Coal Field. 
Fig. 2. Spirifera StoTcesii, Konig. Internal cast of the dorsal valve, area, ventral 
umbo, &o. Mount Britton Gold Field. 
Fig. 3. Do. The same specimen, seen from the ventral side. 
Fig. 4. Do. Cast from an impression of a fragmentary specimen, showing the 
grouping of the radiating costs. Gympie. 
Fig. 5. Spirifera Strzelechn, De Koninck. Cast of the exterior of a large dorsal valve, 
with simple widely separated costa). Gympie. 
Fig. 6. Do. Cast of the interior of the ventral valve (after Etheridge, Quart. 
Journ. Geol. Soc., xxviii., 1. 16, f. 3). Gympie. [R.D.] 
Fig. 7. Do. (?) Cast of the interior of the ventral valve of a small example, 
slightly decorticated (after Etheridge, Quart. Journ. Geol. 
Soc., xxviii., t. 15, f. 4). Gympie. [R.D.] 
Fig. 8. Spirifera vespertilio, G. B. Sowerby. Cast of a dorsal (?) valve with a 
subdivided fold (after Etheridge, Quart. Journ. Geol. Soc., 
xxviii., t. 16, f. 2). Gympie. [R.D.] 
Fig. 9. Spirifera bicarinata, Eth. fil. Cast of a ventral valve, with the deep sinus 
and much extended hinge-line. Port Curtis. 
Fig. 10. Spirifera convoluta, Phillips ? Cast of an indistinctly preserved ventral 
valve. Bowen River Coal Field. 
Fig. 11. Do. Cast of the ventral valve of another example (after Etheridge, Quart. 
Journ. Geol. Soc., xxviii., t. 17, f. 3). Bowen River. [R.D.] 
Fig. 12. Spirifera trigonalis, Martin, var. acuta, Etheridge. Decorticated dorsal valve 
(after Etheridge, Quart. Journ. Geol. Soc., xxviii., t. 16, 
f. 1). Gympie. [R.D.] 
Fig. 13. Spirifera bicarinata , Eth. fil. Cast of a small ventral valve with a deep 
sinus. Stairwell. 
Fig. 14. Spirifera dulia, Etheridge. Dorsal valve (after Etheridge, Quart. Journ. 
Geol. Soc., xxviii., 1. 16, f. 6). Gympie. [R.D.] 
Fig. 15. Spirifera, sp. ind. Cast of a ventral valve, with costas partially united in 
bundles. 
Fig. 16. Spirifera (? S. ClarJcei, De Kon.). Dorsal valve, with a sharp narrow fold, 
and equidistant simple cost®, Bowen River Coal Field, 
