PLATE 12. 
Fig. 
1 . 
Derbyia senilis, Phillips, sp. Dorsal view. Bowen River Coal Field. 
Fig. 
2. 
Do. 
Side view of the same specimen. 
Fig. 
3. 
Do. 
Internal east of a smaller example, showing the cavities left by the 
massive shelly plates diverging from the cardinal process. 
Bowen River Coal Field. 
Fig. 
4. 
Do. 
Fragment of the surface, highly enlarged to show the punctation 
of the test. X 5. 
Fig. 
5. 
Do. 
Portion of the area removed, exposing the bifid cardinal process of 
the dorsal valve. Bowen River Coal Field. 
Fig. 
6. 
Do. 
An undivided cardinal process. 
Fig. 
7. 
il [accoyella reflecta, Moore, sp. Cretaceous. (After Etheridge, as Streptorhynchus 
Davidsoni, Quart. Journ. Geol. Soc., xxviii., t. 17, f. 1.) 
? Waist River. [Q.M.] 
Eig. 8. Strophomena, analoga, Phillips, sp. Dorsal valve (after Etheridge, Quart. 
Journ. Geol. Soc., xxviii., t. 8, f. 1). Don River. [R.D.] 
Fig. 9. Do. Dorsal valve (after Etheridge, Quart. Journ. Geol. Soc., xxviii., t. 
16, f. 7). Gympie. [R.D.] 
Fig. 10. Productus brachythcerus, G. Sowerby. Ventral view, showing long spine- 
bases. Bowen River Coal Field. 
Fig. 11. Do. Dorsal view of the same specimen, with septum visible. 
Fig. 12. Do. Lateral view, showing the somewhat geniculate form of the valve. 
Fig. 13. Do. Lateral view of another example, with numerous impressions 
of spine-bases. Bowen River Coal Field. 
Fig. 14. Productus cora, D’Orbigny. Ventral valve (after Etheridge, Quart. Journ. 
Geol. Soc., xxviii., t. 15, f. 1). Gympie. [R.D.] 
Fig. 15. Productus, sp. ind. (Compare P . jimbriatus, Sby.). Stanwell. 
Fig. 16. Productus wndatus, Def ranee. Portion of the ventral valve of a small 
individual. Stanwell. 
Fig. 17. Productus, sp. ind. Ventral valve, with very regular concentric laminae. 
Burnett District, 
