PLATE ii 

 Glyptorthis viriosa sp. nov. (p. 64) 



Meadowtown Beds, Quinton's Quarry, Shropshire. 

 Figs, i, 2. BB 35521a, b. Latex cast of the exterior and the internal mould of a pedicle 

 valve, x6-8, X5'i. 



Meadowtown Beds, Minicop Farm, Shropshire. 

 Fig. 4. BB 35520a. Internal mould of a brachial valve, X5~5. 



Diparelasma sp. (p. 71) 



Mytton Flags, near Mytton's Beach, Shropshire. 

 Fig. 3. BB 35335a, b. Latex casts of the interior of a brachial valve and the exterior of the 

 complementary pedicle valve, x 8. 



Mytton Flags, near Blakemoorflat, Shropshire. 

 Figs. 7, 8. BB 35336a, b. Latex casts of the exterior and interior of a brachial valve, x 5. 



Astraborthis uniplicata gen. et sp. nov. (p. 70) 



Mytton Flags, near Snailbeach Reservoir, Shropshire. 



Figs. 6, 5, 11. Paratype, BB 35325a, b. Latex casts of the exterior and interior and the 

 internal mould of a brachial valve, x 4-7, X 4, X 4. 



Figs. 14, 9. Holotype, BB 35324a, b. Latex cast of part of the exterior and the internal 

 mould of a pedicle valve, X 4, X 2-8. 



Plectorthis sp. (p. 73) 



Aldress Shales, Ox Wood Dingle, Shropshire. 

 Figs. 15, 12. BB 35466a. Latex cast and mould of the interior of a pedicle valve, x 2-7. 



Plectorthis whitteryensis sp. nov. (p. 71) 



Whittery Shales, River Camlad, Shropshire. 

 Figs. 13, 10. Holotype, BB 35462a, b. Latex cast of the exterior and the internal mould of 

 a pedicle valve, X 3-4. 



Fig. 16. Paratype, BB 37158a. Internal mould of a pedicle valve, X3-5. 

 Fig. 17. Paratype, BB 35463a. Internal mould of a brachial valve, X3'5- 



