FOREIGN UPPER SILURIAN. 261 



The following tables show the distribution in other countries of some species 

 of the Niagara and Lower Helderberg periods. 



1. American Niagara Species occurring elsewhere. 



Halysite8 catenulata, Great Britain (Llandeilo, Dudley, Aymestry), Norway, 

 Sweden, Russia, Eifel. 



Meliolites pyriformis, Great Britain (Wenlock, Aymestry), France, Sweden, 

 Russia, Eifel. 



Stromatopora concentrica, Great Britain (Dudley), Sweden, Russia, Eifel. 



Limaria fruticosa, Great Britain (Dudley, Aymestry), Russia. 



Limaria clathrata {?), Great Britain (Dudley), Russia. 



Ichthyocrinus levis {?), Great Britain (Dudley). 



Eucalyptoerinu8 decor us, Great Britain (Dudley). 



Orthis elegantula, Great Britain (Wenlock), Gothland (in Sweden). 



Orthis hybrida, Great Britain. 



Orthis biloba, Great Britain (Dudley), Gothland. 



Orthis Flabellulum, Great Britain (Bala). 



Leptsena transversalis, Great Britain, Gothland. 



Strophomena rugosa (formerly Leptsena depressa), Great Britain (Dudley, Ay- 

 mestry), Sweden, Russia, Belgium, Eifel, France, Spain. 



Spirifer crispus, Great Britain (Llandeilo, Dudley), Gothland. 



Spirifer radiatus, Great Britain (Dudley). 



Spirifer sulcatus (?), Great Britain (Dudley). 



Atrypa reticularis, Great Britain (Wenlock), Gothland, Germany, Russia 

 (Urals, Altai). 



Merista (Rhynchonella) nitida, Great Britain, Gothland. 



Rhynchonella bidentata, Great Britain (Wenlock). 



Rhynchonella cuneata, Great Britain (Wenlock), Gothland. 



Rhynchonella plicatella, Great Britain (Wenlock, Aymestry). 



Rhynchospira ? {Atrypa) aprinis, Russia. 



Pentamerus brevirostris, Great Britain. 



Pentamerus interplicatus, Great Britain. 



Orthoceras implication, Great Britain (Ludlow), Gothland. 



Orthoceras virgatum, Great Britain. 



Orthoceras undulatum, Great Britain, Eifel. 



Rlsenus (Bumastis) Barriensis, Great Britain (Dudley). 



Phacops limidurus {?), Great Britain (Dudley), Bohemia, Sweden. 



Ceraurus insignis, Bohemia. 



Calymene Blumenbachii, Great Britain (Bala, Wenlock), Sweden, Norway, Bo- 

 hemia, France. 



Homalonotus delphinocephalns, Great Britain (Dudley). 



Pro'etus Stokesii, Great Britain (Dudley). 



2. American Lower Helderberg Species occurring elsewhere. 



Strophomena rugosa, Great Britain (Dudley, Aymestry), Gothland, Russia, Eife), 

 France, Spain. 



