PLATE 27 

 Bystromena perplexa gen. et sp. nov. (p. 146) 



Spy Wood Grit, near Middleton Church, Shropshire. 

 Figs. 2, 1. Paratype, BB 35367a, b. Latex cast of the exterior and the internal mould of 

 a brachial valve, x 7-5. 



Rostricellula sparsa Williams (p. 153) 



Spy Wood Grit, near Rorrington, Shropshire. 

 Figs. 3, 7. BB 35584a, b. Latex cast of part of the exterior and the internal mould of a 

 brachial valve, x 6-9, x 10. 



Fig. 4. BB 35585a. Internal mould of a pedicle valve, x 7-5. 



Leptaena cf. ventricosa Williams (p. 148) 



Whittery Shales, near Hockleton Bridge, Shropshire. 

 Fig. 5. BB 35454. Internal mould of pedicle valve, x 2-5. 



Whittery Shales, near Marrington Farm, Shropshire. 

 Figs. 8, 9. BB 35453a, b. External mould and latex cast of the interior of a brachial valve, 

 X4- x 3-4- 



Kiaeromena cf. kjerulfi (Holtedahl) (p. 149) 



Hagley Volcanics, near Church Stoke Hall, Shropshire. 

 Fig. 6. BB 37132a. Latex cast of the interior of a brachial valve, x 4-8. 



Whittery Shales, River Camlad, Shropshire. 

 Figs, ii, 10. BB 35406a, b. Latex cast of the ornament and the internal mould of a pedicle 

 valve, x 6, X2. 



Zygospira sp. (p. 154) 



Spy Wood Grit, near Rorrington, Shropshire. 

 Figs. 13, 12. BB 37133. Latex cast and mould of the interior of a brachial valve, x n. 



