62 



MATTHEW ON ORGAmSMS OF SILURIAN AND DEVONIAN. 



EXPLANATION OF THE PLATE. 



Fig. 1 



Fig. 2. 

 Figs. 3 



Fig. 4. 



Fig. 5. 

 Fig. 6. 



Fig. 7. 



Fig. 8. 

 Fig. 9, 

 Fig. 10. 

 Fig. 11. 

 Fig. 12. 



— Diplaspis Acadica. Natural size, presenting the interior view of the plates. — a. the rostrum ; 6 6'. the lateral 



cornua ; c. the dorsal scute ; d. the ventral scute ; e, e'. plates beliind the lateral cornua ; /. fragment of a 



plate, perhaps an ocular plate ; g. fragment of a plate, the position of which is not known. Silurian. 

 — Same species. Enlargement of the oval area of the dorsal plate, showing the ornamentation. Mag. Y- 

 and 3'. — Same species. Restoration of the known plates to their supposed position in the dorsal and ventral 



covering. Natural size. The letters have the same signification as in Fig. 1. 

 — Same species. Enlarged view of the inside of some of the principal plates as they appear in the shale 



Mag. 4.y. The letters have the same signification as in Figs. 1 and 3. This figure shows the character 



of the ornamentation. 

 , — Pleragpis rostrala. Outline of the plates of this species. Reduced, J. (After Lankester). Devonian. 

 , — Cyathaxpis Bankni. Showing the form and arrangement of the plates. Natural size. (After Lankester.) 



Silurian. 

 — ScapJuiKpis truncata. Showing the form and arrangement of the ridges of the surface- Natural size. (After 



Lankester.) Silurian. 

 , — Bunoddla horrida, n. gen. et sp. Nearly complete. Natural size. Silurian. 

 . — CtTa(iocar(.9 pMsîVto, n. gen. et sp. Restored. Mag.?. Silurian. 

 — Oeroneura Wilaoni, n. gen. et sp. Mag. S.J. Devonian. 

 — Archseoscolex comeus, r\. geu. et sp. Mag.?. Devonian. 

 — Eurypierella omatti, n. gen. et sp. Mag. î. Devonian. 



