PLATE 12 

 Plectorthis whitteryensis sp. nov. (p. 71) 



Whittery Shales, River Camlad, Shropshire. 

 Fig. 1. Paratype, BB 35464a. Latex cast of the interior of a brachial valve, X3"5- 



Desmorthis ? sp. nov. (p. 73) 



Stapeley Volcanic Group, Perkin's Beach, Shropshire. 

 Fig. 2. BB 35339a. Internal mould of pedicle valve, X5. 

 Fig. 3. BB 35338a. Internal mould of pedicle valve, X 6-3. 



Mytton Flags, near Blakemoorflat, Shropshire. 

 Figs. 8, 4. BB 35337a, b. Latex casts of the exterior and interior of a brachial valve, 

 X4. X3. 



Gelidorthis cf. partita (Barrande) (p. 74) 



Rorrington Beds, Spy Wood Brook, Shropshire. 

 Fig. 5. BB 35419a. Internal mould of a brachial valve, x 7. 

 Fig. 6. BB 35418a. Internal mould of a pedicle valve, x 5. 

 Fig. 7. BB 37159a. Internal mould of a pedicle valve, X5. 



Tazzarinia elongata sp. nov. (p. 75) 



Meadowtown Beds, near Waitchley, Shropshire. 



Figs. 9, 11, 10. Holotype, BB 35332a, b. Latex casts of the exterior and interior and the 

 internal mould of a brachial valve, x 5-5, X 6-2, x 5. 



Figs. 12, 15. Paratype, BB 35333a, b. Latex cast of the exterior and the internal mould of 

 a pedicle valve, x6-i. 



Platystrophia caelata sp. nov. (p. 76) 



Whittery Shales, River Camlad, Shropshire. 

 Figs. 16, 13. Paratype, BB 35495a, b. Latex cast of the exterior and the internal mould of 

 a pedicle valve, x 4, x 2-5. 



Fig. 17. Paratype, BB 35494a. Internal mould of a pedicle valve, x 2-7. 



Whittery Shales, Whittery Quarry, Shropshire. 

 Figs. 19, 14, 18. Holotype, BB 35493a, b. Latex cast and detail of the mould of the exterior 

 and the internal mould of a brachial valve, x 2-6, x 14, x 2-6. 



