PLATE XLIV. 



SILURIAN SPECIES. 



Fig. 

 1 . Strophomena rhomboidalis, Wilckens, sp., ( ? var.) Caradoc ; Craighead Quarry, 



Ayrshire. I a, b, c. Enlarged. 

 .2 — 13, 21,22. „ antiquata, Sow. 2. After the original figure, ' Sil. Syst.,' pi. 



xiii, fig. 13. Wenlock Shale; Woolhope. Mus. 

 Geol. Soc. 3, 4. From the Wenlock Limestone of 

 Dudley. 5. Llandovery (?) ; Penkill, Ayrshire. 6. 

 Wenlock Shale; Wenlock Edge. Mus. Pract. Geol. 

 7. Wenlock Shale; Pentland Hills. 8 b. Internal cast 

 of the ventral valve, and 9, of the dorsal valve, both 

 enlarged; from the same locality. 10, 11. Var. scabrosa, 

 Dav. Wenlock Limestone; Dudley, and Rock Farm, 

 May Hill. 10. Mus. Geol. Soc. 11. Mus. Pract. Geol. 

 12. Interior of the ventral valve, and 13, of the dorsal 

 valve. Wenlock Limestone ; Benthall Edge. 21 and 22. 

 Internal casts. Lower Llandovery ; Gas-works, Haver- 

 fordwest. Mus. Prac. Geol. 



J 4 — 20. „ Jilosa, Sow. 14. Wenlock Limestone; Dudley. 15. Upper 



Ludlow ; Ludlow, and south-west of Hayle, Woolhope. 

 Mus. Pract. Geol. 16. Wenlock Limestone; Usk. 

 Mus. Pract. Geol. 17. Aymestry Limestone; Leint- 

 wardine. Mus. Geol. Soc. 18. Upper Ludlow ; Ring- 

 wood Chase, Ludlow. Mus. Geol. Soc. 19. Interior 

 of the ventral valve. Dudley. 20. Internal casts of 

 the ventral valve. Wenlock Limestone; Llandovery. 

 Mus. Pract. Geol. 



