﻿PLATE X. 



LOWER DEVONIAN. 



Figs. I, 2. Homulonotus elongatus, Salter. Front and side views of a unique specimen in the cabinet 



of Mr. Townshend Hall, of Pilton Rectory, N. Devon. Lowest 

 Devonian ; Meadsfoot, Torquay. 



LOWER SILURIAN. 



Figs. 3 — 10. 1 ,, bisulcatus, Salter. From the Caradoc of Shropshire. 



3. ., ,, Tail, from Wittingslow, Shropshire. (Museum of the Geological 



Society.) 



4. „ „ Body and tail. Same locality and museum. 



5. „ ,, Choice young specimen. Acton Scott. (Mr. Edgell's cabinet.) 



6. ,, Specimen from Bala. N. Wales, elongated by cleavage. (Mus. Pract. 



Geology.) 



7. 8. „ ,, Young specimens. North Wales. Showing a more conical glabella 



than the adult. (Woodwardian Museum.) 

 9. ,, „ Fine head. (Mr. Lightbody's cabinet.) Onny River. 



10. ,, „ Very young head (possibly of the next species.) Horderly. Mr. 



Edgell's cabinet. 



Fig. 11. ,, Eclgelli, Salter. Tail from Acton Scott. (Same cabinet.) 



Figs. 12 — 14. „ rudis, Salter. Caradoc of North Wales and Shropshire. 



12. ., „ Giant specimen. Nantyr, near Llanarmon, in the Berwyn Moun- 



tains, N. Wales. (Mus. Pract. Geology.) 



13. „ Probably same species, showing nodular rings to the axis. Caradoc 



Grits of Cressage, Shropshire. (Mus. Pract. Geology.) 



14. ,, ,, Coiled body (a), and tail (6), from Cader Dinmael, Denbighshire. 



(Mus. Pract. Geology.) 



Figs. 15 — 17. ,, Brongniartii, Deslongschamps. From the Lower Silurian pebbles, Budleigh 



Salterton, S. Devon. (Mr. Vicary's cabinet.) 15. Head, wanting 

 the free cheeks. 16, a, b. Body ring; a shows the blunt end of 

 the pleura, b the axal point. 16. Is an edge view of the ring. 

 17. Tail, with serrate edges. 



Fig. 18. „ — sp. Same locality and cabinet. The last two are also figured in the Quart. 



Geol. Journ., vol. xx. 



1 Wrongly 2 — 10 at bottom of plate. 



