Description of the Devonian Rocks of Ion 
Athyris vittata 
Atrypa hystrix 
Aulopora serpens 
Atrypa reticularis 
Aulopora conferta 
Aviculopecten pari 
ulopecten pecteniformis Chonetes pusilla 
ponderosum 
farnsworthi 
; clarus Chonophyll 
Cladopora lichenoides Cladopora romerii 
Cladopora fisherii Platyceras symmetricu 
Platyceras rectum Platyceras cymbium 
Platyceras auriculatum Platyceras bucculentui 
Crania bordeni Crania hamiltonensis 
Cryptonella planirostra Cryptonella rectirostr; 
Cyathophyllum davidsonii Cyathophyllum scyphi 
Cystiphyllum americanum Heliophyllum halli 
Phacops bufo Discina doria 
Discina media Discina seneca 
Stromatopora alternata 
Gomphoceras lunatum 
Megistocrinus latus 
Meristella haskensii 
Monticulipora monticula 
Orthis iowensis 
Orthis livia 
Paracyclas ohioensis 
Pentamerella dubia 
Favosites hamiltonensis 
Platyceras ammon 
Platyceras argo 
Platyceras bucculentum 
Platyceras cymbium 
Spirifera aspera 
Spirifera ziczac 
Spirifera raricosta 
Spirifera subvaricosa 
Spirifera subattenuata 
Spirifera fimbriata 
Spirifera mucronata {rare) 
Spirifera formosa Spirifera euruteines 
Streptorhynchus chemungensis Terebratula rommgen 
Strophodonta demissa Stromatopora incrustans 
Zaphrentis exigua 
Stromatopora 
Leiorhynchus 
Megistocrinus 
Meristella meta 
Euomphalus cyclostomu 
Orthis vanuxemi 
Paracyclas lirata 
Pentamerus comis 
Philipsastrea gigas 
Favosites niaulus 
Platyceras tetis 
Platyceras conicum 
Platyceras carinatum 
Platyceras erectum 
Spirifera raricosta 
Spirifera tullia 
Spirifera varicosa 
Spirifera subumbonata 
Spirifera pinnata 
Spirifera parryana 
Spirifera mannii 
