Observations on the Silurian and Devonian systems of the United States, with descriptions of new organic remains

T. A. Conrad

1842

Article

Journal of the Academy of Natural Sciences of Philadelphia 8(2):228-280

Find it at:

Taxa discussed in this work:

• Amphiscapha catilloides
• Astartella concentrica
• Calvibembexia sulcomarginata
• Cyclonema bilix
• Cyclonema bilix fluctuatum
• Cypricardites recurvus
• Cyrtolites trentonensis
• Dictyotomaria capillaria
• Floweria chemungensis
• Hippocardia attenuata
• Microdon
• Mourlonia capillaria
• Murchisonia subulata
• Pharkidonotus percarinatus
• Platyceras (Platyostoma)
• Platyceras expansus
• Platyostoma lineata
• Platyostoma unisulcata
• Platyostoma ventricosum
• Platystoma
• Trepospira sphaerulata
• Tropidodiscus curvilineatus
• Whidbornella lachrymosa

Taxonomy:

• Cyclonema bilix fluctuatum belongs to Cyclonema bilix - Conrad (1842)
• Cypricardites recurvus belongs to Cypricardites - Conrad (1842)
• Delthyris acutilirata belongs to Delthyris - Conrad (1842)
• Cyrtolites trentonensis belongs to Cyrtolites - Conrad (1842)
• Platyceras expansus belongs to Platyceras - Conrad (1842)
• Microdon belongs to Bivalvia - Conrad (1842)