PLATE V. 



Fig. 1. — Pteronites angustatus. A right valve. From the Lower Carboniferous series of Lawsion 

 Linns, Liddlewater, Eoxburghshire. In the Collection of the Geological Survey of Scotland. 

 (Page 7.) 



Figs. 2 and 3. — Pteronites angustatus. A right and left valve. From the Lower Carboniferous 

 Beds of Lewisburn, Northumberland. My Collection. (Page 7.) 



Fig. 4. — Pteronites atigustatus. A left valve. From the Calciferous Sandstone series of Glencart- 

 holm, Dumfriesshire. In the Collection of the Geological Survey of Scotland. (Page 7.) 



Fig. 5. — Pteronites angustatus. The specimen in the Griffith Collection at the Museum of Science 

 and Art, Dublin. Probably not the type. From Bruckless, Dunkineely, co. Donegal. (Page 7.) 



Fig. 6. — Pteronites latus. The specimen figured by M'Coy. From Millicent, Clane, co. Kildare. 

 Same Collection. (Page 8.) 



Fig. 7. — Pteronites latus. A left valve. From the Carboniferous Limestone of Grassington, 

 Yorkshire. In the Museum of the Geological Survey, Jermyn Street. (Page 8.) 



Fig. 8. — Adinopteria fluduosa. Probably the type specimen. From Clecklimon, Kilbride. With 

 an enlarged view. Fig. 8 a. In the Collection of the Geological Survey of Scotland. (Page 25.) 



Fig, 9. — Actinopteria fluduosa. A left valve. From the Lower Limestone seines of Beith. In the 

 Collection of Mr. J. Smith, of Kilwinning. (Page 25.) 



Fig. 10. — Actinopteria fluduosa. A left valve. From Waterland, Ayrshire. Same Collection. 

 (Page 25.) 



Fig. 11, — Adinopteria fluduosa. From the First Limestone on the shore east of Kinghorn, Fife. 

 In the Collection of the Geological Survey of Scotland. (Page 25.) 



Fig. 12. — Adinopteria fluduosa. From the West Quarry at Salton. Same Collection. 

 (Page 25.) 



Fig. 13. — Adinopteria sulcata. The type from Manor Hamilton, co. Leitrim. In the Griffith Col- 

 lection, Museum of Science and Art, Dublin. (Page 26.) 



Fig. 14. — Actinopteria persulcata. A specimen broken, so as to assume a triangular form ; from 

 near the Chemical Works, West Calder. In the Museum of tlie Geological Survey, Jenuyn Street. 

 (Page 23.) 



Fig. 15. — Leiopteria obtusa. A beautifully preserved right valve. From Cunningham, Baidland, 

 Dairy. In the Collection of Mr. J. Smith. (Page 21.) 15 a. An enlarged view. 



Figs. 16, 17. — Leiopteria obtusa. A left and a right valve. From Law, Dairy. 16 a, 17 a. 

 Enlarged views. Same Collection. (Page 21.) 



Fig. 18. — Posidonomya membranacea. M'Coy 's type specimen. From Skerries, co. Dublin. In 

 the Gi'iffith Collection, Museum of Science and Art, Dublin. (Page 33 ) 



Figs. 19 — 21. — Posidonomya membranacea. A specimen from bank of river Wharf, below Linton. 

 My Collection. (Page 33.) 



Fig. 22. — Posidonomya membranacea. A large specimen. From Garristowu, co. Dublin. In the 

 Museum of the Geological Survey of Ireland. (Page 33.) 



Fig. 23. — Posidonomya membranacea. A specimen from Newtown, co. Dublin. Same Collection. 

 (Page 33.) 



