PLATE XIII. 



Fig. Page. 



Bronteopsis ardmillanensis, sp. nov. 92. 



1. Head-shield with one free cheek attached. X 2^. Ardmillan. Mrs. 



Gray's Collection. 

 la. Natural cast of same specimen. X 2\. 



2. Pygidium. X 2^. Same locality and Collection. 



3. Head-shield and part of thorax. X 2^. Same locality and Collection. 



4. Pygidium, showing axial rings and pleura?. X 3. Same locality 



and Collection. 



Bronteopsis scotica, Salter. 94. 



5. Imperfect head-shield, showing characters of glabella, fixed cheek, and 



facial suture. X 2. Balclatchie. Mrs. Gray's Collection. 



6. Ditto, showing anterior margin. X 1^- Same locality and Collection. 



7. Thoracic pleura?. X 1^. Same locality and Collection. 



8. Portion of head-shield. X 1|. Same locality and Collection. 



9. Free cheek. X 1^. Same locality and Collection. 



10. Ditto. X 2|. Same locality and Collection. 



11. Nearly complete individual. X 1^. Same locality and Collection. 



(Figured by Nicholson and Etheridge, ' Mon. Silur. Foss. Girvan,' 

 pi. x, fig. 21.) 



12. Pygidium. X 2. Same locality and Collection. 



13. Pygidimn with several thoracic rings attached. X 1\. Same locality 



and Collection. 



Lichas (Corydocepharus) geikiei, Nicholson and Etheridge. 96. 



14. Nearly complete individual, showing head-shield, thorax, and imperfect 



pygidium. X 2^. Thraive Glen. Mrs. Gray's Collection. 

 14a. Side view of same specimen. X 2-J. 



