﻿PLATE XIII. 



UPPER SILURIAN. 



s. 1 — 7. Homalonotus Johannis, Salter. A new species, from the Wenlock Shale 



of Usk. (Cabinet of Mr. John E. Lee, Caerleon.) 



1. „ „ Largest head known, interior cast. The oval spaces 



at the base of the cheeks are well seen. 



2. „ „ Showing the rostral shield, and the granular cheek- 



border — interior cast. 



3. „ „ Imperfect body, and pointed tail, interior. 



4. „ „ Exterior cast, in gutta-percha, of the body-rings. 



5. „ ,, The pleurae from fig. 7, enlarged, to show the 



emarginate tips, and the spinose granules on the 

 border. 



6. „ „ Large but less perfect specimen. Same cabinet. 



7. „ Most complete one known, showing the rostral 



shield, and the deep circumscription of the gla- 

 bella and axis of the tail. The crust is pre- 

 served in part, and is magnified in fig. 5. 



8. „ Rnightii, Murchison. The original specimen figured in the 



' Silurian System.' (Mus. Geol. Society.) 



LOWER SILURIAN. 



The following are from the Budleigh Salterton pebbles in Mr. Vicary's cabinet. 



9. Homalonotus Brongniartii (see PI. X), showing the serrated border and verti- 

 cal margin. Nat. size. 



10- » Vicaryi, n. sp. 10 a (marked //. Winwoodii on plate). A small 



Budleigh specimen. [10 b. A Normandy specimen 

 for illustration. Mus. Geol. Soc] 



All the figures except fig. 5 are of natural size. 



