PALEONTOLOGY. 



181 



HETEROPODA = NUCLEOBRANCHIATA. 



Bellerophon (Ge- 

 nus occurs only 

 up to Carbo- 

 niferous) - - acutus - 

 bilobatus 

 bisulcatus 

 costatus - 

 dilatatus 

 expansus 



hiulcus - 

 nodosus - 

 subglobatus 

 tangentialis 

 trilobatus 



Wenlockensis 

 sp. 



Maclurea 

 Porcellia 



Logani - 

 Peach ii - 

 Puzio 



- L. Silurian. Llandeilo. 



?> 



- L. M. and U. Devonian. 



- Carboniferous. 



- Silurian. Bala to Wenlock. 



- Silurian. Llandovery and 



Ludlow. 



- Carboniferous. 



- L. Silurian. Bala. 



- M. and U. Devonian. 



- Carboniferous. 



- U. Silurian. Ludlow and 



Downton. 

 U. Silurian. Wenlock. 



- U. Cambrian. 2'remadoc. 



slates. 



- L. Silurian. Llandeilo. 



>7 



- Carboniferous. 



HYDROZOA. 



Didymograpsus 



Diplograpsus 



Graptolithus 



Kastrites 



- caduceus 

 geminus 

 Murchisonii 



- bullatus 

 folium - 

 pristis 



- Conybeari 

 Flemingii, and 



4 other species 

 Hisingeri= 



sagittariius - 

 priodon - 



- peregrinus 



- L. Silurian. Bala. 



titiper-Stones. 



Llandeilo. 



L. Silurian. Bala. 



Llandeilo. 



L. Silurian. Bala. 

 1 U. Silurian. Wenlock. 



j- L. Silurian. Llandeilo. 



Silurian. Bala to Ludlow. 

 L. Silurian. Llandeilo and 

 Bala. 



