PLATE III. 



UPPER SILURIAN. 

 Fig. 



1, 2, 3. Phacops Weaveri, Salter. Figs. 2, 3, are from (May Hill? or) Ludlow 



Rocks, Horseshoe Farm, Tortworth. Fig. 1, the head, is 

 added from the May Hill Rock of the neighbourhood 

 to complete the figure of the species. (Mus. Pract. 

 Geology.) 



4 — 14. „ caudatus, var. a. Various figures of ordinary variety, vulgaris, young 



and old, from Dudley. Fig. 4, Mr. Mushen's cabinet, 

 Rushall Canal. Fig. 5, British Museum. Fig. 6, in- 

 terior cast, Ledbury. (Mus. P. Geology.) Figs. 7, 8, 

 labrum, from Mr. Mathews' and Mr. Ketley's cabinets. 

 Fig. 9, side view of head, Dudley. (Mus. Pract. 

 Geology.) Fig. 10, eye (Dr. Grindrod's cabinet), Led- 

 bury. Fig. 11, same, magnified. Fig. 12, interior cast, 

 Ledbury (Mus. Pract. Geology), shows the casts of 

 the interior of the gland-like tubercles (see p. 52), 

 such as are seen on the exterior of figs. 16, 17. 

 Fig. 13, large but worn Dudley specimens (in Brit. 

 Mus.), figured by Konig under the name of Asajihvs 

 wgops. Fig 14, fine interior, in Mr. Mushen's cabinet. 



15. ,, „ Young (Brit. Mus.), showing the central tubercles. 



16, 17. „ „ Dwarf specimens, retaining the characteristic tubercles of 



the young state; Ledbury. (Fig. 16, from my own 

 cabinet. Fig. 17, Mus. Pract. Geology.) 



18. „ „ var. 8, aculeatus. Wren's Nest, Dudley (Mr. Ketley's 



cabinet). All the above are from the Wenlock Lime- 

 stone. 



19 — 28. Phacops longicaudatus, Murchison. Figs. 19 — 21, ordinary variety, a. Figs. 



22 — 28, short-tailed variety, (3. All from Wenlock 

 Shale. Figs. 19, 20, are Burrington specimens. 

 (Mus. Pract. Geology.) Fig. 21, Brit. Mus. Fig. 

 22—25 are from the Wenlock Shale of the 

 Malvern Railway. (Mr. Mushen.) Fig. 23, Dr. 

 Grindrod. Fig. 26, Brit. Mus. Fig. 27 is from 

 the Rushall Canal. (Mr. Mushen's cabinet.) 



