PLATE XVI. 



Via. Page. 



Acidaspis grayae, R. Etheridge. 114. 



1. Pygidium. x 3. Balclatchie. Mrs. Gray's Collection. 



2. Head-shield, x 4. Same locality and Collection. (Figured by Nicholson and 



Etheridge, pi. viii, fig. 18, as A. Ullage.) 



Acidaspis hystrix, Wyv. Thomson. 116. 



3. Incomplete individual, x 4. Balclatchie. Mrs. Cray's Collection. 



4. Pygidium. x 6. Same locality and Collection. 



5. Portion of thorax with pygidium attached, x 6. Same locality and Collection. 



Acidaspis lalage, Wyv. Thomson. 117. 



6. Head-shield. x 6. Balclatchie. Mrs. Cray's Collection. (Figured by Nicholson 



and Etheridge, op. cit., fasc. i, pi. viii, fig. 21.) 



Acidaspis cf. dalecarlica, Tomquist. 119. 



7. Pygidium. x 4. Shalloch Mill. Mrs. Cray's Collection. 



Encrinurus punctatus (Briinnich), var. arenaceus, Salter. 120. 



8. Pygidium. X 3. Miimntiun. Mrs. Cray's Collection. 



Encrinurus multisegmentatus (Portlock). 122. 



9. Portion of head-shield and of thorax, x 2\. Starfish Bed, Thraive Clen. Mrs. Cray's 



Collection. 



10. Imperfect head-shield and thorax. x 2. Same locality and Collection. 



11. Nearly complete individual, partly enrolled, x 2£. Same locality and Collection. 

 11a. Same specimen, showing margin of head-shield and position of hypostome. x 2£. 



Cybele cf. aspera, Linnarsson. 128. 



12. Head-shield, x 2|. Ardmillan. Mrs. Cray's Collection. 



13. Ditto, showing genal angle, x 3. Dow Hill. Same Collection. 



Cybele bellatula (Dalman). 124. 



14. Head-shield, x 2-J. Dow Hill. Mrs. Cray's Collection. 



15. Portion of thorax with pygidium. x 2. Same locality and Collection. 



16. Pour thoracic rings, x 2L Same locality and Collection. 



17. Free cheek, probably belonging to this species, x 2£. Same locality and Collection. 



