PLATE XVII. 



i'iq. Page. 



Cybele loveni, var. nov. girvanensis. 126. 



1. Head-shield with a few thoracic segments attached, x In. Thraive Glen. Mrs. Gray's 



Collection. 

 la. Same specimen, viewed from behind, x 1 ' . 



2. Another specimen of complete enrolled individual, x 24. Same locality and Collection. 

 2a. Same specimen, showing posterior part of thorax and pygidium. x 2\. 



3. Another specimen, showing genal spine and produced pleurae of 6th thoracic segment. 



x H. Same locality and Collection. 



4. Pygidium of another individual. x 2. Same locality and Collection. 



Cybele, sp. ind. (a). 130. 



5. Head-shield, x 2\. Balclatchie. Mrs. Gray's Collection. (Figured by Nicholson and 

 Etheridge, op. cit., fasc. ii, p. 203, pi. xiv, fig. 12, as Cheirurus ? sp. ind.) 



Cybele, sp. ind. (b). 130. 



6. Imperfect head-shield, x 3. Dow Hill. Mrs. Gray's Collection. 



7. Impression of another head-shield, x 3. Ardmillan. Same Collection. 



8. Pygidium, probably belonging to this species, x 5. Dow Hill. Same Collection. 



Dindymene COrdai, Etheridge and Nicholson. 132. 



9. Complete individual, x 3. Thraive Glen. Mrs. Gray's Collection. 



10. Imperfect specimen, showing pygidium and thorax, x 3. Same locality and Collection. 



11. Imperfect head-shield, showing front margin. x 3. Same locality and Collection. 



Calymene blumenbachi, Brongniart. 133. 



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



13. Head-shield of variety. x 2\. Newlands. Same Collection. 



Calymene blumenbachi, var. nov. drummuckensis. 135. 



14. Hypostome. x 3. Thraive Glen. Mrs. Gray's Collection. 



Calymene planimarginata, sp. nov. 137. 



15. Outline tracing from Salter's figure of C. senaria (' Mon. Brit. Trilob..' pi. ix, fig. 8). 



Calymene cambrensis, Salter. 136. 



16. Outline tracing from Salter's figure, op. cit., pi. ix, fig. 12. 



