TABLE OF CHAUACTERISTIC GENERA. 



413 



II. TABLE OF CHARACTERISTIC GENERA. 



Systems 



1. Cambrian, or 

 Lower Silurian. 



■2. Silurian. 



3 Devonian. 



4, Carboniferous. 



Genera and Sub-genera. 



{' Camaroceras,Endoceras, Gouioceras.Pterotlieca. 

 Maclurea, Raphistoma, Holopea, Platyceras. 

 Ortliisina, Platystropliia, Porambonites, Pseudo-crania. 

 Ambonychia, Modiolopsis, Lyrodesma. 



r Actinoceras, Phragraoceras, Trochoceras, Ascoceras. 

 ■j Theca, Holopella, Murchisonia, Ati7pa, Retzia. 

 ^ Cardiola, Clidophorus, Goniophorus, Grammysia. 



/-Bactrites, Gyroceras, Clymenia, Apioceras, Serpularia. 

 < Spirifera, Uncites, Merista, Davidsonia, Calceola, 

 '- Stringoceplialus, Megalodon, Orthonota, Pterinea. 



Nautiloceras, Discites, Goniatites, Porcellia. 

 Naticopsis, Platyschisma, Metoptoma, Producta. 

 Aviculo-pecten, Anthracosia, Conocardium, Sedgwickia. 



Permian. 



f Camaropliori 

 I? 



Aulosteges, Strophalosia. 

 Myalina, Bakewellia, Axinus, Edmondia. 



f Ceratites, Naticella, PLatystoma, Koninckia, Cyrtia. 



6. Trias. 



7. L. Jurassic. 



H. U. Jurassic. 



9. L. Cretaceous. 



10. U. Cretaceous. 



Monotis, Myophoria, Pleuropliorus, Opis. 



/Belemnites, Beloteuthis, Geoteuthis, Ammonites. 

 Alaria, Trocliotoma, Rimula, Pileolus, Cylindrites. 

 I Waldheimia, Thecidium, Spii'iferina, Ceromya. 

 ^ Gryphaea, Hippopodium. Cardinia, Myoconcha. 



f Coccoteuthis, Acauthoteuthis, Leptoteuthis, Nautilus. 

 I Spinigera, Purpurina, Nerinaea, Neritoma. 

 1 Pteroperna, Trichites, Hypotrema, Diceras. 

 V Trigonia, Pachyrisma, Sowerbia, Tancredia. 



I Crioceras, Toxoceras,Hamulina, Baculina. 

 1 Requienia, Caprinella, Sphasra, Thetis. 



. Belemnitella, Conoteuthis, Turrilites, Ptyclioceras. 

 I Hamites, Scaphites, Pterodonta, Cinulia, Tylostoma. 

 "I Acteonella, Globiconcha, Trigonosemus, Magaa, Lyra, 

 >. Neitliea, Inoceramus, Hippurites, Caprina, Caprotina 



(Beloptera, Lychnus, Megaspira. Glandina, Typhis. 

 Volutilithes, Clavella, Pseudoliva, Seraphs, Rimella. 

 Couorbis, Sirepsidura, Globulus, Phorus, Velates. 

 Chilostoma, Volvaria, Litbocardium, Teredina. 



r Spirulirostra, Aturia, Vaginella, Ferussina, 



< Halia, Pi-oto, Desbayesia, Niso, Cassidaria, Carolia 



V Grateloupia, Artemis, Tapes, Jouannetia. 



11. Eocene. 



12. Miocene. 



13. Plioceni 



(A> 



Arqonnvta, Stromhus, Purpxira, Trophon. 

 Yoldia, Tridacna, Circe, Veriicordla. 



