PLATE XXV. 



Figs. 1 and 1 a. — Streblopteria concentrica. Apparently a right valve. The counterparts of the 

 same shell. From the Lower Limestone Series of Howrat, in the Collection of Mr. J. Smith, 

 Kilwinning. (Page 127.) 



Fig. 2. — Posidoniella sulcata. A right valve, the type, from a marine band below the Gin Mine 

 Coal, Nettlebank, N. Staffordshire. My Collection. (Page 134.) 



Figs. 3 — 6. — Posidoniella sulcata. Fig. 4, left valve ; Figs. 3, 5, and 6, right valves. Fig. 3 

 distorted by crushing. Same locality and Collection. (Page 134.) 



Fig. 7. — Pachypteria nobilissiina. A right or lower valve. From the Carboniferous Limestone of 

 Park Hill. My Collection. (Page 126.) 



Fig. 8. — Megambonia carbonifera. The left valve, incomplete posteriorly, showing anterior adduc- 

 tor muscle scar(*). Fig. 8 a, the right valve, incomplete in front. From the Carboniferous Limestone 

 of Kniveton. My Collection. (Page 133.) 



Fig. 9. — Aviculopecten Jonesii. A right valve. The Upper Limestone Series of Orchard. In the 

 Collection of Mr. J. Neilson. (Page 129.) 



Fig. 10. — Aviculopecten Jonesii. The type, a left valve, in the Griffith Collection. From Black 

 Lion, co. Leitrim. (Page 129.) 



Fig. 11. — Aviculopecten Jonesii. A left valve, from Hill Bolton, Yorks. My Collection. 

 (Page 129.) 



Figs. 12 and 13. — EJmondia punctatella. A left and right valve. From Thornliebank. In the 

 Collection of Mr. J. Neilson. (Page 147.) 



Fig. 14. — Pterinopecten carbonarius. The type, a right valve from a bed 69 feet below the roof of 

 the 4-foot coal, Cheadle, Staffs. My Collection. (Page 128.) 



Fig. 15. — Pterinopecten carbonarius. A right valve from the Pendleside Series, Bosley Minn, 

 Cheshire. My Collection. (Page 128.) 



Fig. 16. — Pterinopecten carbonarius. A left valve. From a marine band below the Gin Mine, 

 Nettlebank, North Staffordshire. (Page 128.) 



Fig. 17. — Scaldia minuta. A left valve from Coal Measures, Weston Coj'ney, North Staffs. My 

 Collection. (Page 152.) 



Fig. 18. — Carbonicola Vinti. A left valve, from Chatterley, North Staffordshire. My Collection 

 (Page 144.) 



Fig. 19. — Carbonicola Vinti. A left valve. Same locality, my Collection. (Page 144.) 



Fig. 20. — Carbonicola Vinti. A right valve. Same locality and Collection. (Page 144.) 



Fig. 21. — Anthracomya calcifera,. The type, a right valve, roadside, Bradwell, North Stafford- 

 shire. My Collection. (Page 146.) 



Fig. 22. — Anthracomya calcifera. A right valve, roadside Bradwell, North Staffordshire. My 

 Collection. (Page 146.) 



Fig. 23. — Anthracomya calcifera. Etruria Marls, Hem Heath, Chesterton, North Staffordshire. 

 My Collection. (Page 146.) 



Fig. 24. — Pterinopecten pustulosus. The left valve. From Kniveton, Derbyshire. My Collection. 

 (Page 128.) 



