40 On Palaeozoic Bivalved Entomostraca. 



Fig. 3. The same : cast of right valve, showing muscle-spot. Millburn, 



Campsie. Fig. 4. Dorsal view. Fig. 5. Ventral view. 

 Fig. 6. The same : right valve. Ryhope Colliery, Sunderland. 

 Fig. 7. The same : right valve. Millburn, Campsie. Fig. 8. End view. 

 Fig. 9. The same : portion of surface of specimen from Provanhall. X 



75 diam. 

 Fig. 10. The same : portion of surface of specimen from Whifnet. X 



75 diam. 

 Fig. 11. Carbonia fabulina, vax. humilis: left valve. Craigenglen. 

 Fig. 12. The same : right (?) valve. Craigenglen. Fig. 13. Dorsal 



outline. 

 Fig. 14. The same: left valve, showing muscle-spot. Pirnie Colliery, 



Leven, Fife. 

 Fig. 15. Carbonia fabulina, var. inflata : left valve and part of the edge 



of right valve. Pirnie Colliery. Fig. 16. Ventral view. Fig. 17. 



End outline. 

 Fig. 18. The same : cast of right valve, showing muscle-spot. Craigen- 

 glen. Fig. 19. Dorsal outline. 

 Fig. 20. Carbonia fabulina, var. subangulata : left valve. West of Pit- 



tenweem. 

 Fig. 21. The same : cast of right valve, showing muscle-spot. West of 



Pittenweem. Fig. 22. Ventral outline. Fig. 23. End outline. 

 Fig. 24. Carbonia fabulina, var. subangulata (?) : right valve. Millburn, 



Campsie. 



Plate III. 



All the figures magnified 25 diameters, except fig. 8, which is more 

 highly magnified. 



Fig.l. Carbonia Rankiniana: left valve. West of Pittenweem. 



Fig. 2. The same : right valve. Provanhall. Fig. 3. Dorsal outline. 



Fig. 4. Ventral outline. Fig. 5. End outline. 

 Fig. 6. The same : cast of right valve, showing transverse furrow. West 



of Pittenweem. 

 Fig. 7. The same : cast of right valve, showing muscle-spot and slight 



furrow. West of Pittenweem. 

 Fig. 8. The same : portion of surface. Provanhall. X 75 diam. 

 Fig. 9. Carbonia subula : left valve. Crossgatehall, near Edinburgh. 

 Fig. 10. The same: right valve. Gilmerton. Fig. 11. Ventral outline. 



Fig. 12. Dorsal outline. Fig. 13. End outline. 

 Fig. 14. Carbonia scalpellus : cast of left valve, showing muscle-spot. 



Ryhope Colliery. 

 Fig. 15. The same : right valve, showing muscle-spot. Ryhope Colliery. 



Fig. 16. Ventral outline. Fig. 17. End outline. 

 Fig. 18. Carbonia secans : right valve. Craigenglen. 

 Fig. 19. The same : left valve. Craigenglen. Fig. 20. Dorsal outline. 

 Fig. 21. Carbonia pungens : cast of left valve, showing the muscle-spot. 



Methil. 

 Fig. 22. The same : right valve. Craigenglen. Fig. 23. Dorsal out- 

 line. 

 Fig. 24. Cythere (?) bairdioides : right valve. Pirnie Colliery. Fig. 25. 



Dorsal outline of single valve. 

 Fig. 26. Cythere ? near C. ? bairdioides : right valve. Craigenglen. 



Fig. 27. Dorsal outline. 



