﻿PLATE IX. 



Fig. Page 



1. Pteraspis rostrata (Ag.) ; transverse section of dorsal shield, 



in outline. — Lower Old Red Sandstone ; Goldtops, 

 Newport. Monmouthshire. [P. 5037.] 162 



2. 2 a. Ditto ? ; ventral shield (" Scaphaspis lewisi "), inferior 



and lateral aspects, two-thirds nat. size. — Lower Old 

 Rsd Sandstone ; Kentchurch, Herefordshire. 



[P. 5861.] 164 



3. Cyaihaspis banksi (Huxl. & Salt.) ; portion of dorsal shield, 



outer aspect, twice nat. size, showing ornament. — Upper 

 Silurian Bone-bed ; Martel, near Ledbury. 



[P. 3241.] 172 



4. Cyaihaspis maccullouglii, sp. nov. ; dorsal shield, visceral 



aspect and partly an impression of outer aspect. — Lower 

 Old Red Sandstone ; Bodenham. [P. 4797.] 172 



5. Cephalaspis campbelltonensis, "Whiteaves ; dorsal shield, 



imperfect posteriorly, shown as impression of visceral 

 aspect, two-thirds nat. size. — Lower Devonian ; Camp- 

 bellton, New Brunswick. [P. 5479.] 191 



6. Cephalaspis murchisoni, Eg. ; imperfect inferior rim of 



shield. — Lower Old Red Sandstone Passage Beds ; 

 Ledbury. [P. 6111.] 190 



7. 7 a. Didymaspis grindrodi, Lank. ; ventral shield, visceral 



aspect, and transverse section of matrix lying between 

 dorsal and ventral shields. — Lower Old Red Sandstone ; 

 Bush Pitch, Ledbury. [P. 5043.] 200 



8. 8 a. Ditto ; imperfect dorsal shield, with portion of tuber- 



cular ornament enlarged four times. — Ibid. 



[P. 5313.^ 200 



