PLATE VT. 



Fig. Paoe. 



1. Arhlai^piii {jirimnensh, sp, nov. Complete individual, x 3. Starfish 



Bed, Thraive Glen . . . . . :33 



2. Ditto. Impression of part of tliorax and pygidinm. x 3. Same 



horizon and locality . . . . .33 



3. Ditto. Impression of pygidinm with part of thorax attached, x 1. 



Same horizon and locality . . . . .33 



4. Aridasjns jjloi/fdiri, sp. no\. Pygidinm with part of thorax attached. 



X 10. Whitehonse Group, Whitehouse Bay . . . 35 



5. Ditto. Cranidium. x (>. Same horizon and locality . . 35 



6. Ditto. Impression of same cranidium. x G . . . 35 



7. Acidaspis fprrihilix, sp. nov. Internal cast of nearly complete indi- 



vidual. X 3. Starfish Bed, Thraive Glen . . . 30 



8. Ditto. Impression of same specimen, x 3 . . . 30 



9. Ditto. Detached pygidinm. x 4. Same horizon and locality . 30 



10. Ditto. Restoration of head-shield, one thoracic ring and pygidinm . 30 



1 1 . Encrinuriis content/us, sp. nov. Side view of pygidinm. x 4. Balclatchie 



Group, Balclatchie . . . . .39 



12. Ditto. Another pygidinm. x 4. Same horizon and locality . 39 



