THE SILURIAN ROCKS OF SOUTHWEST SCOTLAND. 453 



EURYPTERIDA. 



Eurypterus lanceolatus, Salt. Ludlow : Lesmahagow. 



E. obesus, Woodw. Ludlow : Lesmahagow. 



E. scorpioides, Woodw. Ludlow : Lesmahagow. 



E. dolicoschelus, Laurie. Downtonian : Lesmahagow. 



E. sp. Hagshaw Hills. 



Pterygotus bilobus, Salt. Ludlow and Downtonian : Hagshaw Hills. 



P. bilobus. var. accidens, Woodw. Ludlow : Hagshaw Hills. 



P. bilobus, var. inornatus, Woodw. Ludlow : Hagshaw Hills. 



P. bilobus, var. perornatus, Salt. Ludlow : Hagshaw Hills. 



P. raniceps, Woodw. Ludlow : Hagshaw Hills. 



Slimonia acuminata, Salt. Ludlow and Downtonian : Hagshaw Hills. 



Stylonurus Logani, Woodw. Ludlow : Hagshaw Hills. 



S. ornatus, Laurie. Downtonian : Hagshaw Hills. 



ARACHNID A. 



Palaeophonus caledonicus, Hunter. Ludlow : Lesmahagow. 

 P. sp. Downtonian : Hagshaw Hills. 



MYRIAPODA. 



Archidesmus loganensis, Peach. Ludlow : Lesmahagow. 

 A. sp. Ludlow and Downtonian : Lesmahagow. 



