﻿PLATE XII. 



UPPER SILURIAN (LUDLOW ROCK.) 



Fig. 1. Homalonotm {Koenigid) ludensis, Salter, (not of ' Sil. System')- Nat. 



size. So far as known, a unique 

 specimen. (Mr. Edgell's cabinet.) 



Figs. 2— 10. „ Knightii, Koenig. 



2- „ „ Perfect head, showing the sinuated front ; at 



b, the attachment for the labrum. (Mr. G. 

 Cocking's collection.) 



3. „ „ Fine specimen, from Ludlow Museum, with the 



crust preserved (all the others are casts). 



4. „ „ Interior cast, showing the depressed spaces at 



the base of the cheeks. 



5. „ „ Half-coiled specimen, copied from the ' Silurian 



System.' Ludlow. 



6. „ „ Half- grown specimen, the original from which 



Dr. Koenig's figure in the ' Icones Sectiles ' 

 was taken. Probably from Radnorshire. 



7. „ „ The largest specimen known : from the Upper 



Ludlow Rock of Malvern. (Dr. Grindrod's 

 cabinet.) 



8. 8#.' „ „ Side view of the same. 8 a. Two of the pleurae 



magnified, to show the granules (not squamae) 

 in this species. 



9. „ „ Side view and underside of tail ; showing the 



strong broad fascia, granulated and angularly 

 bent along its middle. Ludlow. (Mr. Cock- 

 ing's cabinet.) 



10. „ ,, Labrum of an Upper Ludlow specimen. Ludlow 



Museum. (Mr. Edgell's cabinet.) 

 Fig.ll. „ Johannis, Salter (see also PI. XIII). Wenlock Rocks 



of Carmarthenshire. (Mus. Pract. Geology.) 



