INDEX OF SPECIFIC NAMES. 



The following index shows the specific and varietal names employed for American Ordoviciatt and 

 Silurian fossils and indicates the genera or combinations under which each has been used. 



abbreviata — Calymene, Cyrtospira, Lep- 

 erditia hisingeri, Lophospira uniangu- 

 lata, Murchisonia, Murcbisonia unian- 

 gulata, Ruedemannia, Subulites. 



abdita — Opliileta. 



abnormalis — Pseudocrinites. 



abnormis (e) — Actinoceras, iEehmina, 

 Clonograptus, Dichograptus, Graptoli- 

 thus, Graptolithus (Monoprion), IIolo- 

 cystites, Lophospira, Orthoceras. 



aboynensis — Illsenus. 



abruptus (a, um) — Bathyurellus, Colpo- 

 mya, Corynotrypa, Ctenodonta, Cyrto- 

 ceras, Gyroceras, Liospira, Oncoceras, 

 Orthoceras, Paleopupa, Pleurotomaria, 

 Soerichnites, Tellinomya, Vanuxemia. 



absimilis — Ctenodonta, Tellinomya. 



acadiae — Rhynchospira, Trematospira. 



acadicus (a, um) — Agnostus, Ctenopyge, 

 Cyathaspis, Dictyonema flabelliforme 

 Diplaspis, Grammysia, Tteraspis. 



acadiensis — Crania, Ilelopora fragilia 



acamas — Bronteus, Goldius. 



acanthinus — Callicrinug. 



acanthonotus — Tetragrapsus. 



acanthoptera — Stropheodonta, Strophom- 

 ena. 



acanthura — Protopeltura. 



accelerans — Eurystomitea. 



acceleratum — Cycloceras ineeptum, Or- 

 thoceras inceptum. 



accola — Eunoa. 



acervulosa — Cyphotrypa, Leptotrypa. 



achates — Dalmanites, Pterygometopus. 



aciculatus (a) — Arabellites, Murchisonia. 



acinacellum — Cyrtoceras . 



acinus — Camarotoechia, Rhynchonella. 



acmea (um) — Fenestella, Semicoscinium. 



acrea — Murchisonia, Turritoma. 



aculeatus — Ceratiocaris, Cladopora, Dim- 

 erocrinus, Diplograptus, Ilormotoma, 

 Loxonema, Rhodocrinus (Thysanocri- 

 nus). 



acuminatus (a, um) — Ceratiocaris, Daw- 

 sonia, Escharopora, Glossina, Lacco- 

 phyllum, Lingula, Lingulella, Lingu- 

 lepis, Lophospira, Lyrodesma, Maclu- 

 rea, Maclurites, Murchisonia, Obolus, 

 Orthis, Physetomya, Platystropliia, Pti- 

 lodictya, Trimerella, Wliitfieldella. 



acuta — Carinaropsis, Maclurina manito- 

 bensis, Pachydictya, Ptilodictya, Ra- 

 pliistoma, Stictopora, Strophomena, 

 Strophomena neglecta. 



acuticaudatus — Pterygotus . 



acutidens — Didymograptus. 



acutilirata — Delthyris, Orthis biforata, 

 Platystropliia. 



acutilobus (a) — Bilobites, Orthis. 



acutiplicata — Ortliis. 



acutirostra — Ambonychia, Atrypa, Myti- 

 larca. 



acutirostris — Ambonychia, Byssonychia, 

 Lingula, Rhynchonella, Zygospira. 



acutumbona — Cypricardites, Cyrtodonta, 

 Vanuxemia, Whitella. 



acutus (um) — Bathyurus, Bellerophon, 

 Bellerophon bilobatus, Cyrtolites, Dip- 

 lograptus, Diplograptus foliaceus, Grap- 

 tolithus, Oxydiscus, Sinuitescancellata, 

 Tryblidium. 



ada — Murchisonia, Turritoma. 



adelina — Ectomaria, Murchisonia, Sole- 

 nospira. 



adherens — Stenopora. 



adipatus — Ilolocystites. 



adrastica — Modiolopsis. 



adscendens — Clitambonites, Orthisina. 



sedilis — Cladopora, Eridotrypa, Monticu- 

 lipora. 



semulus — Cyathocrinus (Poteriocrinus), 

 Ilomocrinus. 



seneas — Trochoceras. 



aequalis (e) — Eurychilina, Lingula, Melo- 

 crinus, Monotrypella, Monticulipora, 

 Orthoceras, Orthoceratites, Primitia. 

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