PLATE IX. 



Fig. Page. 



Illaenus barriensis (Murchison.) 58. 



1. Head- shield without free cheeks. X 1|. Bargany Pond Burn. Mrs. Gray's Collection. 



2. Pygidimn. x 11. Same locality and Collection. 



Illaenus extensus, sp. nov. 61. 



3. Complete individual, x 2. Starfish Bed, Thraive Glen. Mrs. Gray's Collection. 



4. Hollow cast of same specimen. x 2. Same locality and Collection. 



5. Epistome. x 2L Same locality and Collection. 



Illaenus latus, M'Coy. 



6. Pygidium. x 2. Minuntiou. Mrs. Gray's Collection. 



7. Ditto, showing post-axial groove. x 2. Same locality and Collection. 



Illaenus macallumi, Salter. 65. 



8. Head-shield, x 2. Mulloch Hill. Mrs. Gray's Collection. 

 0. Pygidium. x 2. Same locality and Collection. 



Illaenus murchisoni, Salter? 65. 



10. Pygidium. Nat. size. Craighead. Mrs. Gray's Collection. 



11. Free cheek, x H. Same locality and Collection. 



12. Epistome, probably belonging to this species, x H. Same locality and Collection. 



Illaenus nexilis, Salter. 66. 



13. Epistome. Nat. size. Craigens. Mrs. Gray's Collection. 



Illaenus portlocki, Salter. 67. 



14. Pygidium with thorax attached, x 1L Craighead. Mrs. Gray's Collection. 



15. Head-shield, perhaps referable to this species. Nat. size. Same locality and Collection. 



16. Pygidium, showing broad axis. Nat. size. Same locality and Collection. 



