PLA.TE XLIII. 



SILURIAN SPECIES. 



Fig. 

 1 — 11. Stropho7nena pecten,'L\m\G. 1. A very large example. Wenlock Shale ; near 



Walsall. 2. The same locahty. 3. From the Wenlock 

 Limestone of Dudley. 4, 5, 6. Wenlock Shale ; Pent- 

 land Hills. 5, 6. Internal casts. 7, 8. Interior of 

 valves. Dudley. 9. Young shells ( = " Ortkis minuta," 

 Haswell). Pentland Hills. 10, 11. Young shell { = 

 " Orthis semicircularis," Sow.). Llandovery rocks ; Hope 

 Quarry, Minsterley. Mus. Geol. Soc. 



12—14. „ applanata, '^sMqy. Wenlock Shale; Pentland Hills. 12 a, b. 



Enlarged. 



15. „ Hendersoni.Dnv. Wenlock Shale ; Pentland Hills. 



16 — 20. „ ornatella, Salter. Upper Ludlow; WhiteclifF, Ludlow. 16. 



Internal casts, nat. size. 17 a,b. Complete shell, enlarged. 

 1 b. Interior of dorsal valve. 18 3. A part of the cast, greatly 

 enlarged. 19, 20. Interiors of ventral valve. 19 a. 

 Internal cast of ventral valve, enlarged. 



