PLATE XV. 



Fig. Page. 



Lichas (Amphilichas) hibernicus (Portlock). 106. 



1. Glabella, x I3. Craighead. Mrs. Gray's Collection. 



2. Imperfect head-shield. X 2. Balclatchie. Mrs. Gray's Collection. (Figured by 



Nicholson and Etheridge, op. cit., fasc. i, pi. ix, fig. 10.) 



3. Hypostome. x 2. Same locality and Collection. 



Lichas (Amphilichas), sp. 109. 



4. Imperfect glabella. Nat. size. Dow Hill. Mrs. Gray's Collection. 



5. Portion of pleura, x 2. Same locality and Collection. 



Lichas (Conolichas) cf. aequiloba, Steinhardt. 109. 



6. Imperfect head-shield, x 5. Starfish Bed, Thraive Glen. Mrs. Gray's Collection. 



Lichas, sp. ind. 110. 



7. Imperfect head-shield, x 5. Balclatchie (conglomerate). Mrs. Gray's Collection. 



Lichapyge ? problematica, sp. nov. 110. 



8. Pygidium with three thoracic segments, x 7. Whitehouse Bay. Mrs. Gray's Collection. 



9. Ditto, x 7. Same locality and Collection. 



10. Ditto, x 7. Same locality and Collection. 



Acidaspis barrandei, Fletcher and Salter. 112. 



11. Imperfect head-shield. Nat. size. Penkill. Mrs. Gray's Collection. 



Acidaspis CailipareOS, Wyv. Thomson. 112. 



12. Imperfect head-shield, x 2. Woodland Point. Mrs. Gray's Collection. 



13. Outline restoration from figure given by Wyv. Thomson in ' Quart. Journ. Geol. Soc.,' 



vol. xiii, 1857, pi. vi, fig. 11. 



Acidaspis coronata, Salter. 113. 



14. Pygidium. x 2 1. Woodland Point. Mrs. Gray's Collection. 



Acidaspis deflexa, Lake. 113. 



15. Complete individual, x 3. Rough Neuk. Mrs. Gray's Collection. 



Acidaspis grayae, R. Etheridge. 114. 



16. Nearly complete individual, x 3. Balclatchie. Mrs. Gray's Collection. (Figured by 



Nicholson and Etheridge, op. cit., fasc. i, pi. viii, fig. 26.) 



17. Ditto, x 3. Showing pygidial spines. Same locality and Collection. 



18. Outline restoration of pleura, showing terminal spines. 



