334 



GEOLOGY OF THE BRISTOL COAL-FIELD. 



pileopsideus (Phill.) 

 Dionysii (Goldf.) 

 triangulatus (Stodd.) 

 Loxonema rugifera (Phill.) 

 Capulus vetustus (Mondf.) 

 Natica plicistria (Phill.) 

 variata (Phill.) 

 eUiptica (PhiU.) 

 Naticopsis spirata (McCoy ) 

 Bellerophon apertus (Sow.) 

 Discites compressus (McCoy.) 

 Nautilus biangulatus (Sow.) 



dorsalis (Phill.) 

 Orthoceras cinctum (Sow.) 

 gregarium do. 

 Bre^nii (Mart.) 

 Cyrtoceras sp ? 



Amblypterus Portlocki (Egert.) 

 Cladodus Milleri (Ag.) 

 mirabilis do. 



conicus do. 



Deltoptychius acutus do. 



Tomodus convexus do. 



Chomatodus cinctus do. 



linearis do. 



Cochliodus contortus do. 



Ctenacanthus brevia do. 



minor do. 

 Ctenacanthus tenuistriatus do. 



Helodus gibberulus do. 



loevissimus do. 



subteres do. 



turgidus do. 



Onchus hamatus do. 



sulcatus do. 



Orodus cinctus do. 



ramosus do. 



Oracanthus Milleri do. 



minor do. 



pustulosus do. 



Psammodus porosus do, 



ruffosus. do. 



