Fig. i. BB 35433. 



PLATE 17 

 Horderleyella cf. plicata Bancroft (p. 102) 



Aldress Shales, Ox Wood Dingle, Shropshire. 

 Internal mould of a brachial valve, X4"5. 



Figs. 



X7-5- 



Fig. 



2, 3- 



Horderleyella sp. (p. 104) 



Meadowtown Beds, near Meadowtown Chapel, Shropshire. 

 BB 35420a, b. Internal mould and latex cast of the exterior of a pedicle valve, 



Fig. 



5- 



Holotype, 



BB 35513a 



Fig. 



6. 



Paratype, 



35 355^ 



Fig. 



7- 



Paratype, 



BB 35515. 



Fig. 



8. 



Paratype, 



BB 35514a 



Fig. 



9- 



Paratype, 



BB 35518a 



Reuschella horderleyensis carinata subsp. nov. (p. 104) 



Whittery Shales, near Marrington Farm, Shropshire. 

 Paratype, BB 35519a. Internal mould of a brachial valve, x 6. 



Whittery Shales, River Camlad, Shropshire. 



Internal mould of a pedicle valve, x 2-1. 

 Internal mould of a pedicle valve, x 1-9. 

 Latex cast of the exterior of a pedicle valve, x 2-1. 

 Internal mould of a brachial valve, x 2-6. 

 Latex cast of the interior of a brachial valve, x 2. 



Heterorthis sp. (p. 106) 



Spy Wood Grit, near Rorrington, Shropshire. 



Figs, 10, 14, 12. BB 35424a, b. Latex casts of the exterior and interior and the internal 

 mould of a brachial valve, x 8, x 6, x 4-9. 



Figs, ii, 13. BB 35423a, b. Latex cast of the exterior and the internal mould of a pedicle 

 valve, x 6. 



Tissintia prototypa Williams (p. 108) 



Lower Llanvirn ashy shales, near Llwyn Bedw Farm, Llandeilo, Carmarthenshire. 

 Fig. 15. BB 35310. Latex cast of the interior of a brachial valve, x 3-2. 

 Fig. 16. BB 35305. Latex cast of the interior of a brachial valve, x 3-3. 

 Figs. 18, 17. BB 35309. Latex cast and internal mould of a brachial valve, x 2-3. 

 Fig. 19. BB 35308. Latex cast of the exterior of a brachial valve, X3 - 5- 



