13$ 2 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



notum — Trochoceras. 

 novacarlislensis (e) — Cycloceras, Ortho- 

 ceras. 

 novascoticus — Chonetes. 

 novascotius (a) — Chonetes, Discina. 

 noveboracensis — Temnograptus. 

 noveboracum — Monomorella, Nanno. 

 novellus — Chaunograptus, Dendrograp- 



tus. 

 novicia — Ctenodonta, Tellinomya. 

 micella — Heliolites subutubulata. 

 nucleiformis — Ctenodonta, Tellinomya. 

 nucleolatus (a) — Atrypa, Merista, Meris- 



tella, Pleurotomaria, Rbynchonella, 



Uncinulus, Whitfieldella. 

 nucleus — Atrypa, Botryocrinus, Cama- 



rella, Cyathocrinus, Dendrocrinus, Gy- 



pidula, Homocrinus, Pentamerus, Sie- 



berella, Triplecia. 

 nucula — Rhynchonella, Terebratula. 

 nuculiforniis — Clidophorus, Ctenodonta, 



Lyonsia, Modiolopsis, Tellinomya. 

 nuculitiformis — Ribeira. 

 numeria — Liospira, Pleurotomaria. 

 numerosus — Trachomatiehnus. 

 numitor — Ceraurus, Cheirurus, Niesz- 



kowskia. 

 nummiformis — Callopora, Calloporella, 



Mesotrypa. 

 nummularium — Ortboceras . 

 numulatum — Actinoceras lata, Orthoceras 



(Actinoceras) lata. 

 numulus — Orbiculoidea. 

 nundina — Syntrophia. 

 nuperus — Ceraurus, Cheirurus. 

 mitans — Streptorhynchus, Strophomena, 



Stropomena (Hemipronites). 

 nutrix — Camarotcechia, Rhynchonella. 

 nuxmoschata — Astylospongia prasmorsa, 



Caryospongia juglans. 

 nycteis — Metoptoma, Triblidium, Try- 



blidium. 

 nympha — Eoorthis desmopleura, Lingula, 



Orthis (Plectorthis) desmopleura. 

 nymphale — Cyathophyllum. 

 nysius — Conchidium, Pentamerus. 

 obconicus — Comarocystites, Comarocys- 



tites shumardi, Eucalyptocrinus, Eu- 



spirocrinus, Macrostylocrinus, Maria- 



crinus, Melocrinus, Stephanocrinus, 



Streptosolen. 

 obelisca — Hormotoma, Murchisonia, Mur- 



ehisonia (Fusispira). 



oberon — Orthoceras. 



obesus (a, urn) — Byssonychia, Cyrto- 

 donta, Eurychilina, Fusispira, Gom- 

 phoceras, Holopea, Olenus scarab^- 

 oides, Pachydictya, Poterioceras, Proto- 

 warthia, Sinuites, Sinuopea, Subulites. 



oblata — Atrypa nitida, Lingula, Merista 

 nitida, Orthis, Trematis, Whitfield ella, 

 Whitfieldella nitida. 



obliquata — Cardiomorpha, Ceromyopsis, 

 Ptilotrypa, Whitella. 



obliquior — S treptelasma . 



obliquis — Diplograpsus. 



obliquus (a) — Anthaspidella, Arabellites, 

 Conradella, Ctenobolbina, Ctenodonta, 

 Cypricardites, Cyrtodonta, Eurychilina 

 Favosites, Holopea, Homotrypa, Hu- 

 ronia, Lophospira, Mytilarca, Nucula, 

 Opisthoptera, Palseoconcha, Phragmo- 

 lites, Ptilodictya, Rhinidictya, Scsevo- 

 gyra, Stictopora, Streptelasma, Telli- 

 nomya, Tentaculites, Turbo, Zaphren- 

 tis. 



oblongus (a) — Actinomya, Aparchites, 

 Bathyurus, Caryocaris, Cuneamya, Cy- 

 cloconcha, Lingula, Lloydia, Melocri- 

 nus, Modiolopsis, Pentamerus, Ptero- 

 nitella, Whiteavesia. 



obovatum — Dictyonema. 



obpyramidalis — Actinocrinus, Melo- 

 crinus, Stephanocrinus. 



obpyriformis— Favosites, Odontocaulis. 



obscurus (a, urn) — Avicula, Clidophorus, 

 Cyrtoceras, Dekayella, Dekayia, Holo- 

 pea, Jonesella, Leperditella, Leperdi- 

 tia, Leptaena, Palseophycus, Parastro- 

 phia, Plectoceras, Porambonites, Pte- 

 rinopecten, Rafinesquina, Strophome- 

 na, Turbo. 



obsoletus (a, urn)— Acanthonema holopi- 

 formis, Acidaspis, Bucania, Conchi- 

 dium, Cyclonema, Cypricardia, Cypri- 

 cardites, Eotomaria, Eunema, Euom- 

 phalopterusalatus, Holopea, Lophospira 

 (Seelya) lirata, Modiolopsis, Pleuroto- 

 maria, Pleurotomaria (Turritella), Pro- 

 tozyga, Sarcinula, Spirifer (Eospirifer) 

 radiatus, Staurocephalus, Tetranota, 

 Zygospira. 



obstructum — Orthoceras. 



obtusifrons — Cypricardites, Vanuxemia. 



obtusiplicata — A t r y p a, Camarotcechia, 

 Rhynchonella. 



