PLATK XVI. 



Fig. 

 1. Eloniclithys Aitl-eni, Traquair ; natural size. From the " Cop)' " Coal Mine, 

 Cliviger, Lancashire (Lower Coal Measures). Formerly in the Collection of the 

 late Mr. John Aitken, of Bacup. Present ownership unknown to the Author. 



•2 



Elonichtkys Aitlceni, Traquair ; anotiier specimen ; natural size. F^rom the Dale- 

 moor Rake L'onstone, Stanton, Derbyshire. \\\ the Museum of Practical Geology, 

 Jermyn Street, London. 



I 



