INDEX OP SPECIFIC NAMES. 



The following index shows the specific and varietal names employed for American Ordovician 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, Murchisonia unian- 

 gulata, Ruedemannia, Subulites. 



abdita Ophileta. 



abnormalis Pseudocrinites. 



abnormis (e) Actinoceras, ^Echmina, 

 Clonograptus, Dichograptus, Graptoli- 

 thus, Graptolithus (Monoprion), Holo- 

 cystites, Lophospira, Orthoceras". 



aboynensis Illaenus . 



abruptus (a, um) Bathyurellus, Colpo- 

 mya, Corynotrypa, Ctenodonta, Cyrto- 

 ceras, Gyroceras, Liospira, Oncoceras, 

 Orthoceras, Paleopupa, Pleurotomaria, 

 Sserichnites, Tellinomya, Vanuxemia. 



absimilis Ctenodonta, Tellinomya. 



acadiae Rhynchospira, Trematospira. 



acadicus (a, um) Agnostus, Ctenopyge, 

 Cyathaspis, Dictyonema flabelliforme 

 Diplaspis, -Grammysia, Pteraspis. 



acadiensis Crania, Helopora fragilis 



acamas Bronteus, Goldius. 



aoanthinus Callicrinus. 



acantlionotus Tetragrapsus . 



acanthoptera Stropheodonta, Strophom- 

 ena. 



acanthura Protopeltura . 



accelerans Eurystomites. 



acceleratum Cycloceras inceptum, Or- 

 thoceras inceptum. 



accola Eunoa. 



acervulosa Cyphotrypa, Leptotrypa. 



achate s Dalmanites , Pterygometopus . 



aciculatus (a) Arabellites, Murchisonia. 



acinacellum Cyrtoceras. 



acinus Camarotcechia , Rhynchonella . 



acmea (um) Fenestella, Semicoscinium. 



acrea Murchisonia, Turritoma. 



aculeatus Ceratiocaris, Cladopora, Dim- 

 erocrinus, Diplograptus, Hormotoma, 

 Loxonema, Rhodocrinus (Thysanocri- 

 nus). 



acuminatus (a, um) Ceratiocaris, Daw- 

 sonia, Escharopora, Glossina, Lacco- 

 phyllum, Lingula, Lmgulella, Lingu- 

 lepis, Lophospira, Lyrodesma, Maclu- 

 rea, Maclurites, Murchisonia, Obolus, 

 Orthis, Physetomya, Platystrophia, Pti- 

 lodictya, Trimerella, Whitfieldella. 



acuta Carinaropsis, Maclurina manito- 

 bensis, Pachydictya, Ptilodictya, Ra- 

 phistoma, Stictopora, Strophomena, 

 Strophomena neglecta. 



acuticaudatus Pterygotus. 



acutidens Didymograptus . 



acutilirata Delthyris, Orthis biforata, 

 Platystrophia. 



acutilobus (a) Bilobites, Orthis. 



acutiplicata Orthis. 



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, Sinuites cancellata, 

 Tryblidium. 



ada Murchisonia, Turritoma. 



adelina Ectomaria, Murchisonia, Sole- 

 nospira. 



adherens Stenopora. 



adipatus Holocystites. 



adrastica Modiolopsis. 



adscendens Clitambonites, Orthisina. 



eedilis Cladopora, Eridotrypa, Monticu- 

 lipora. 



semulus Cyathocrinus (Poteriocrinus) , 

 Ilomocrinus. 



seneas Trochoceras. 



sectualis (e) Eurychilina, Lingula, Melo- 

 crinus, Monotrypella, Monticulipora, 

 Orthoceras, Orthoceratites, Primitia. 

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