PLATE 20 

 Bicuspina subquadrata sp. nov. (p. 117) 



Whittery Shales, Whittery Quarry, Shropshire. 

 Figs, i, 2. Paratype, BB 35482a, b. Latex cast of the exterior and the internal mould of a 

 pedicle valve, X2-8. 



Bicuspina modesta sp. nov. (p. 118) 



Spy Wood Grit, near Rorrington, Shropshire. 



Figs. 3, 4. Paratype, BB 35512a, b. Latex cast of the exterior and the internal mould of a 

 brachial valve, X 3-4. 



Figs. 5, 6. Holotype, BB 35510a, b. Latex cast of the exterior and the internal mould of a 

 pedicle valve, X 3-2, X 3-5. 



Figs. 7, 8. Paratype, BB 35511a, b. Latex cast of the exterior and the internal mould of a 

 brachial valve, X33. 



Oxoplecia cf. nantensis MacGregor (p. 125) 



Meadowtown Beds, near Waitchley, Shropshire. 

 Figs. 10, 9. BB 35320a, b. Latex cast of the exterior and the internal mould of a pedicle 

 valve, x 3. 



Fig. 12. BB 35321. Internal mould of a brachial valve, X4 - 5- 



Fig. 13. BB 35323. Latex cast of the interior of a brachial valve, x 5. 



Meadowtown Beds, near Little Weston, Shropshire. 

 Fig. 11. BB 35322a. Internal mould of a brachial valve, x 3-5. 



Caeroplecia plicata gen. et sp. nov. (p. 122) 



Whittery Shales, Whittery Quarry, Shropshire. 

 Figs. 15, 14. Paratype, BB 35349a, b. Latex cast of the exterior and the internal mould of 

 a brachial valve, x 3. 



Fig. 16. Paratype, BB 35351b. Latex cast of the exterior of a brachial valve, X 3-2. 



