﻿PLATE IX. 



MIDDLE AND LOWER SILURIAN. 



Figs. 1—5. 



1. Calymene Blumenbachii, Brongn, var. o, auctorum. Interior cast, from the Woolhope or 



Lower Wenlock Grits of Bogmine, Shelve, Shropshire. (Mus. Prac. 

 Geology.) The crust of this specimen is much thickened. 



2. „ Same species and variety. Llandovery Rock, Mullock, near Girvan, Ayr- 



shire. (Mus. Pract. Geology.) [The labrum figured in PI. VIII, fig. 9, 

 is from the same locality.] 



3. ,, var. Caractaci. Fine specimen from a large slab in the Geological Society's 



Museum. Acton Scott, Shropshire. 



4. „ Do. A head from Shropshire. (Mr. Edgell's cabinet.) 



5. „ The same variety, from Gen. Portlock's collection in Mus. Pract. Geology. 



(C brevicapitata, Portl., in part.) 

 Figs. 6 — 11. „ senariu, Conrad. 



6. 7. ,, „ (Original figured specimens of Calym. brevicapitata, Portl.) from Caradoc 



Rocks, Tyrone. Interior cast. (Mus. Pract. Geol.) 



8. ,, A head of same species from Caradoc Rocks of Dolbenmaen, near Pwllheli, 



Caernarvonshire. Interior cast. (Mus. Pract. Geol.) 



9. ,, [A specimen with external crust from the blue Trenton Limestone of Ohio, 



N. America. (Mus. Pract. Geology.)] 



10. ,, „ Young, perfect (the specimen figured in the Memoirs of the Geol. Survey, 



vol. ii, plate 1, plate 11). 10 a. Tail magnified. Bala, N. Wales. 



11. „ „ Head from same locality. (Mus. Pract. Geol.) 

 Figs.12 — 14. „ Cambrensis, Salter. 



12. ,, „ Interior cast of glabella, Llandeilo Flags, Lann Mill, Narberth. 



13. ,, „ Cast of exterior of perfect specimen. Near Llandeilo, in Llandeilo flags. 



(In the cabinet of J. E. Lee, Esq., Caerleon.) 



14. „ „ Same species. (M'Coy's figured specimen of C. brevicapitata. Wood- 



wardian Museum.) 

 Figs. 15 — 18. „ Tristani, Brongn. 



15. 16. „ „ Llandeilo or Arenig Rocks; Gorran Haven, Cornwall. (Mr. Edgell's 



cabinet.) 



1/. „ „ Tail of same species, from the Budleigh Salterton pebble-bed. (See 



Quart. Geol. Journ. for 1864, vol. xx, pi. xv, fig. 5, where the same 

 specimen is figured.) 



18. ,, „ [Outline head from Nehou, Normandy, for comparison.] 



Figs. 19 — 24. „ duplicata, Murchison. 19. Small specimen, var. o (mas), Pen Cerrig, Builth. 



(Mus. Pract. Geology.) 20. Dissected head, same locality and collec- 

 tion. 21. Large tail, same locality. (Mr. Griffith Davies's cabinet.) 

 22. Labrum, natural size and twice magnified ; Builth. (Mus. Pract. 

 Geology.) 23. Nearly complete specimen from Builth (Mr. Edgell's 

 cabinet) ; the front of the head is added in outline from other specimens. 

 24. Variety (foemina), probably the ? form. Trecoed, Builth. (Mus. 

 Pract. Geology.) 



Fig. 25. „ parvifrons, Salter. Arenig group (Lower Llandeilo). Tai Hirion, Bala (Woodw. 



Museum). 



Figs. 26 — 28. „ id. var. Murchisoni. Same formation, west of Stiper Stones, Shropshire. Fig. 



28 is partly restored in shaded outline, derived from several specimens, 

 to show the probable shape of the entire tail. 



