PLATE 7D. 
Fig. 1 - 14. 
Acidaspis tuberculatus. 
Page 
368 
1. View of a specimen preserving the members in connexion; but the fossil being imbedded 
in a bard stone, the condition does not admit of the parts being shown in detail. 
1 a. The counterpart of fig. 1, showing the extensions of the lateral spines and the form of the 
pygidium. 
2. The central portion of the head, showing the lobes of the glabella, the frontal border, the 
occipital annulation, and the central posterior spine. 
3. The central part of the head of another specimen. 
5. A portion of the surface enlarged. 
6 & 7. The right cheeks of two different individuals, preserving the eye tubercle, and showing 
differences in the exterior and inner spines. 
8. The left cheek, which shows very distinctly, as do the others, the gradation of the border 
ornaments, from small nodes at the anterior extremity, to distinct spines. 
8 a. A cheek, with the eye tubercle, enlarged. 
9 & 10. The underside of two cheeks, one of which shows a single spine on the inside, and the 
other a single spine with the rudiments of two others above it. 
11. An articulation of the thorax. 
12. The underside of a part of the thorax, showing the extension of the lateral spines of the 
articulations. 
13. The pygidium, in which the upper lateral spine is not fully developed. 
14. The pygidium of another individual, showing the parts described. 
Fig. 15 - 19. 
Acidaspis hamata. 
371 
15. A small individual preserving the central portion of the head and the occipital spine. 
16. A larger individual. 
17. Profile view, showing the recurved spines. 
18. The bifurcating occipital spine of a larger individual. 
19. A fragment of the thorax, and the pygidium, probably of this species. 
19 a. A fragment of the thorax of a large individual, showing the prolongation of the lateral 
lobes into spines. 
