PLATE XII. 



Fig. Page. 



Phillipsinella parabola (Barrande). 85. 



1. Head-shield and anterior portion of thorax of enrolled individual, x 3. Thraive Glen. 



Mrs. Gray's Collection. 

 la. Pygidium and posterior portion of thorax of same specimen, x 3. 



2. Imperfect specimen, showing genal spines and pygidium. x 4. Same locality and 



Collection. 



Menocephalus ? (Tbrnquistia) of. nicholsoni, Eeed. 86. 



3. Head-shield, without free cheeks, x 5. Balclatchie. Mrs. Gray's Collection. 



4. Ditto, showing faint basal lobes to glabella, x 5. Same locality and Collection. 



5. Ditto, showing course of right facial suture. X 10. Same locality and Collection. 



(5. Nearly complete individual, showing thorax and pygidium. X 7. Same locality and 



Collection. 

 7. Pygidium. x 7. Same locality and Collection. 



BronteUS andersoni, Nicholson and Etheridge. 87. 



8. Pygidium (oval form). x 2. Penkill. Mrs. Gray's Collection. 



9. Pygidium (parabolic form). x 2. Same locality and Collection. 



10. Nearly complete head-shield, x 2L Same locality and Collection. 



11. Imperfect glabella and cheek, showing anterior margin and facial suture, x 2j. Same 



locality and Collection. 



Bronteus craigensis, sp. nov. 89. 



12. Pygidium, showing short triangular axis. x 1-A-. Craighead. Mrs. Gray's Collection. 



13. Ditto. xl|. Same locality and Collection. 



Bronteus grayi, sp. nov. 90. 



14. Imperfect pygidium (hollow cast). Nat. size. Craighead. Mrs. Gray's Collection. 

 (Figured by Nicholson and Etheridge, ' Mon. Silur. Poss. Girvan,' pi. xii, fig. 6, as 

 Bronteus sp. hid. a.) 



Bronteus, sp. ind. (a). 91. 



15. Epistome. x 2h. Craighead. Mrs. Gray's Collection. 



Bronteus, sp. ind. (b). 91. 



16. Portion of head-shield, x 2. Craighead. Mrs. Gray's Collection. 



