PLATE VIII. 



Page. 

 Cyclopyge armata (Barrande). 51. 



1. Pygidium. x 2. Whitehouse Bay. Mrs. Gray's Collection. 



Cyclopyge rediviva (Barrande). 52. 



2. Complete individual, x 5. Whitehouse Bay. Mrs. Gray's Collection. 



3. Head-shield, x 4. Same locality and Col'ection. 



Bohemilla, sp. 53. 



4. Glabella ?. x 5. Whitehouse Bay. Mrs. Gray's Collection. 



Illeenus gemulus, Salter. 54. 



5. Pygidium, showing traces of pleurae. Natural size. Penkill. Mrs. Gray's Collection. 



IllaenuS aemulllS, Salter, var. 55. 



6. Pygidium. x 2. Woodland Point. Mrs. Gray's Collection. 



7. Nearly complete individual, x 1-L Same locality and Collection. 



8. Head-shield. Nat. size. Same locality and Collection. 



9. Free cheek, x 2. Same locality and Collection. 



10. Pygidium. x H. Penkill. Same Collection. (Figured by Nicholson and Etheridge, 



' Mon. Silur. Foss. Girvan,' pi. xi, fig. 10.) 



11. Epistome, probably belonging to this variety. X 1|. Same locality and Collection. 



(Figured by Nicholson and Etheridge, ' Mon. Silur. Foss. Girvan,' pi. xi, fig. 13.) 



Illsenus balclatchiensis, sp. nov. 56. 



12. Pygidium. x 2. Balclatchie. Sedgwick Museum. 

 12a. Same specimen, viewed from side. 



13. Pygidium and portion of thorax, x 2. Balclatchie. Mrs. Gray's Collection. 



14. Complete individual, x 2|. Same locality and Collection. 



15. Head-shield, x 2. Ardmillan. Same Collection. 

 15a. Same specimen, viewed from side. 



16. Head-shield, x 3. Balclatchie. Same Collection. 



