1456 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Lyrodesma acuminatum Ulrich. (D.) 



Lyrodesma acuminatum intermedium Ulrich. (D.) 



Madurites bigsbyi (Hall). (P.) 



Madurites bigsbyi dixonensis (Ulrich). (P.) 



Madurites depressus (Ulrich and Scofield). (P.) 



Madurites logani (Salter). (Le.) 



Madurites nitidus (Ulrich and Scofield). (P.) 



Macrocyprisf siliqua (Jones). (Le.) 



Macronotella scofieldi Ulrich. (P., L.) 



Mxlonoceras falx (Billings). (Le.) 



Mxlonoceras neleus (Hall). (P.) 



Msdonoceras prxmaturum (Billings). (Le.) 



Mastigograpttis? flaccidus Ruedemann. (L.) 



Matheria rugosa Ulrich. (D.) 



Mesotrypa infida (Ulrich). (D.) 



Mesotrypaf spinosa Ulrich. (D.) 



Modiolodon(f) gibbus Ulrich. (D.) 



Modiolodon subrhomboideus Branson. (A.) 



Modiolopsis adrastia Billings. 



Modiolopsis arguta Ulrich. (D.) 



Modiolopsis chatfieldensis Ulrich. (D.) 



Modiolopsis concava Ukich. (D.) 



Modiolopsis expansa Branson. (A.) 



Modiolopsis nais Billings. (Le.) 



Modiolopsis obsoleta Ulrich. (D.) 



Modiolopsis obtusa (Hall). (L.) 



Modiolopsis parviuscula Billings. 



Modiolopsis similis Ulrich. (D.) 



Monotrypa magna Ulrich. (P.) 



Monticulipora incompta Ukich. (D.) 



Moorea angularis Ulrich. (D.) 



Mooreaf perplexa Ulrich. (D.) 



Moorea punctata Ulrich. (D.) 



Murchisoniaf varicosa Hall. (L.) 

 Nanno aulema Clarke. (D.) 



Nicholsonella laminata Ukich. (D.) 



NicJiolsonella ponderosa Ulrich. (P.) 



Nilcus vigilans (Meek and Worthen). (P., D.) 



Omospira alexandra (Billings). (Le.) 



Omospira laticincta Ukich. (L.) 



Onchometopus simplex Raymond. (P.) 



Oncoceras abruptum Hall. (P.) 



Oncoceras alceus Hall. (P.) 



Oncoceras brevicurvatum Whitfield. (P.) 



Oncoceras carvcri Clarke. (P.) 



Oncoceras huronense (Billings). 



Oncoceras lycus (Hall). (P.) 



Oncoceras pandion Hall. (P.) 



Oncoceras plebeium Hall. (P.) 



Ophiletina angularis Ukich and Scofield. (D.) 



Ophiletina sublaxa Ukich and Scofield. (P.) 



Orbignyclla wethcrbyi (Ulrich). (L., P.) 



Orthis tricenaria Conrad. (P., D., L., A.) 



Orthoceras amplicameratum Hall. (P.) 



Orthoceras decrescens Billings. (Le.) 



OrlJioceras drummondi Billings. 



Orlhoceras fusiforme Hall. 



Orlhocerasjunceum Hall. (D., P.) 



Orthoceras menelaus Billings. 



Orthoceras multicameratum Emmons. (D.) 



Orthoceras ottawaense Billings. (Le.) 



Orthoceras perparvum Billings. 



Orthoceras pertinax Billings. (Le.) 



Orthoceras rectkameratum Hall. (L.) 



Orthoceras tencrum Billings. (Le.) 



Orthoceras tenuistriatum (Hall). (P.) 



Orthoceras tyronense Foerste. (L.) 



Orthodesma antiquum Whiteaves. (L.) 

 Orthodesma minnesotensc Ulrich. (D.) 

 Oxydiscus argo (Billings). (Le.) 

 Oxydiscus disculus Billings. 

 Pachydictya everetti Ulrich. (P.) 

 Pachydictya fimbriata Ukich. (D.) 

 Pachydictya foliata Ulrich. (D.) 

 Pachydictya occidentalis Ukich. (D.) 

 Palxacmza humilis Ulrich and Scofield. (D., P.) 

 Parallelodus obliquus Branson. (A.) 

 Petrocrania ulrichi (Hall and Clarke). (D.) 

 Phragmolites fimbriatus (Ulrich and Scofield). (P.) 



D., A.) 



Phragmolitcs obliquus (Ukich and Scofield). (D.) 

 Phragmolites similis (Ulrich). (L., Le.) 

 Phragmolites triangularis (Ulrich and Scofield). (P.) 

 Phyllod ictya frondosa Ukich. (L.) 

 Phyllodictya varia Ulrich. (D.) 

 Phytopsis tubulosa (Hall). (L.) 

 Pianodema subxquata (Conrad). (L., D., P., A.) 

 Pianodema subxquata circularis (N. H. Winchell). 



(D.) 

 Pianodema subxquata conradi (N. H. Winchell). 



(P.) 



Pianodema subxquata gibbosa (Billings). (D.) 

 Pianodema subxquata perveta (Conrad). (P., D.) 

 Platyceras depressum Ukich and Scofield. (D.) 

 Platyceras(f) wisconsinensis Ukich and Scofield. 



(P) 



Plectambonites sericeusf Sowerby. 

 Plectoceras halli (Foord). 

 Plectoceras? undatum (Conrad). (W.) 

 Plectoceras undatum occidental (Hall). (P.) 

 Plethocardia? cordiformis (Billings). 

 Plethocardia umbonata Ukich. (D., L., Le.) 

 Pleurotomaria mohawkensis Miller. (L.) 

 Plcurotomariaf nucleolata Hall. (L.) 

 Pleurotomariaf obsoleta Hall. (L.) 

 Pleurotomaria quadricarinata Hall. (L.) 

 Podolilhus dendrocrinus Sardeson. (D.) 

 Podolithus eucheirocrinus Sardeson. (D.) 

 Podolithus schizocrinus Sardeson. (D.) 

 Porocrinus pentagonius Meek and Worthen. (P.) 

 Prasopora conoidea Ukich. (D.) 

 Prasopora contigua, Ukich. (D.) 

 Prasopora grandis (Ukich). (D.) 

 Prasopora lenticularis Ukich. (D.) 

 Prasopora sirnulatrix Ukich. (D.) 

 Primitia celata Ulrich. (D.) 

 Primitia duplicata Ulrich. (D.) 

 Primitia mammata Ulrich. (D.) 

 Primitia minutissima Ukich. (D.) 

 Primitia sanctipauli Ukich. (D.) 

 Primitiella constricta Ukich. (L., P.) 

 Primitiella fillmorensis Ukich. (D.) 

 Primitiella limbata Ukich. (D.) 

 Primitiella simulans Ukich. (D.) 

 Priscochiton canadensis (Billings). (Le.) 

 Proboscina tumulosa Ulrich. (D.) 

 Promopalxaster? wilsoni (Raymond). (L.) 

 Pterotheca attenuata (Hall). (L., P., D.) 

 Pterotheca expansa (Emmons). (L., P., A.) 

 Pterygometopus callicephalus Hall. (P., D.) 

 Pterygometopus intermedius (Walcott). (P., D., A.) 

 Pterygometopus lincolnensis Branson. (A.) 

 Pterygometopus schmidti Clarke. (P.) 

 Rafinesquina alternataf Conrad. 





