1456 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Lyrodesma acuminatum Ulrich. (B.) 



Lyrodesma acuminatum intermedium Ulricli. (B.) 



Maclurites bigsbyi (Hall). (P.) 



Maclurites bigsbyi dixonensis (Ulrich). (P.) 



Maclurites depressus (Ulrich and Sec-field). (P.) 



Maclurites logani (Salter). (Le.) 



Maclurites nitidus (Ulrich and Scofleld). (P.) 



Macrocypris? siliqua (Jones). (Le.) 



Macronolella scoficldi Ulrich. (P., L.) 



Mxlonoceras fall (Billings). (Le.) 



Mxlonoceras neleus (Hall). (P.) 



Mxlonoceras prxmaturum (Billings). (Le.) 



Mastigograptus? flaccidus Ruedemann. (L.) 



Mathcria rugosa Ulrich. (B.) 



Mcsotrypa infida (Ulrich). (B.) 



Mcsotrypa? spinosa Ulrich. (B.) 



Modiolodon{?) gibbus Ulrich. (B.) 



Modiolodon subrhomboidcus Branson. (A.) 



Modiolopsis adrastia Billings. 



Modiolopsis arguta Ulrich. (B.) 



Modiolopsis chatfieldcnsis Ulrich. (D.) 



Modiolopsis concava Ulrich. (B.) 



Modiolopsis expansa Branson. (A.) 



Modiolopsis nais Billings. (Le.) 



Modiolopsis obsolcta Ulrich. (B.) 



Modiolopsis obtusa (Hall). (L.) 



Modiolopsis parviuscula Billings. 



Modiolopsis similis Ulrich. (B.) 



Monotrypa magna Ulrich. (P.) 



Monticulipora incompta Ulrich. (B.) 



Moorca angularis Ulrich. (B.) 



Moorca? pcrplexa Ulrich. (D.) 



Moorca punctata Ulrich. (B.) 



Murchisonia? varicosa Hall. (L.) 



Nanno aulema Clarke. (B.) 



Nicholsonella laminata Ulrich. (B.) 



Nicholsonella ponderosa Ulrich. (P.) 



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



Omospira alexandra (Billings). (Le.) 



Omospira laticincta Ulrich. (L.) 



Onchomctopus simplex Raymond. (P.) 



Oncoceras abruptum Hall. (P.) 



Oncoccras alccus Hall. (P.) 



Oncoceras brevicurvatum Whitfield. (P.) 



Oncoceras carvcri Clarke. (P.) 



Oncoceras Tiuronense (Billings). 



Oncoccras lycus (Hall). (P.) 



Oncoceras pandion Hall. (P.) 



Oncoceras plcbeium Hall. (P.) 



Ophilctina angularis Ulrich and Scofield. (B.) 



Ophihlina sublaxa Ulrich and Scofield. (P.) 



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



Orthis triccnaria Conrad. (P., B., L., A.) 



Orthoceras amplicamcratum Hall. (P.) 



Orthoccras dccrcscens Billings. (Le.) 



Orthoceras drummondi Billings. 



Orthoccras fusiforme Hall. 



Orthoccras junccum Hall. (B., P.) 



Orthoccras mcnclaus Billings. 



Orthoccras multicamcratum Emmons. (B.) 



Orthoceras ottawaense Billings. (Le.) 



Orthoccras perparvum Billings. 



Orthoccras pcrtinax Billings. (Le.) 



Orthoccras recticameratum Hall. (L.) 



Orthoceras tencrum Billings. (Le.) 



Orthoceras tenuistriatum (Hall). (P.) 



Orthoccras tyronense Foerste. (L.) 



Orlhodesma antiquum Whiteaves. (L.) 

 Orthodesma minnesotensc Ulrich. (B.) 

 Oxydiscus argo (Billings). (Le.) 

 Oxydiscus disculus Billings. 

 Pachydictya cverelti Ulrich. (P.) 

 Pachydictya fimbriata Ulrich. (B.) 

 Pachydictya foliata Ulrich. (B.) 

 Pachydictya occidentalis Ulrich. (B.) 

 Palxacmxa humilis Ulrich and Scofield. (B., P.) 

 Parallclodus obliquus Branson. (A.) 

 Peirocrania ulrichi (Hall and Clarke). (B.) 

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



B., A.) 

 Phragmolites obliquus (Ulrich and Scofield). (B.) 

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

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

 Phyllodictya frondosa Ulrich. (L.) 

 Phyllodictya varia Ulrich. (B.) 

 Phytopsis tubulosa (Hall). (L.) 

 Pianodcma subxquata (Conrad). (L., B., P., A.) 

 Pianodema subxquata circularis (N. H. Whichell). 



(D-) 

 Pianodema subxquata conradi (N. H. Winchell). 



(P.) 

 Pianodema subxquata gibbosa (Billings). (B.) 

 Pianodema subxquata pcrvcta (Conrad). (P., B.) 

 Platyceras deprcssum Ulrich and Scofield. '(B\) 

 Platyccras{?) wisconsinensis Ulrich and Scofield. 



(P) 

 Plcctambonitcs sericeusf Sowerby. 

 Plectoccras halli (Foord). 

 Plcctoceras? undatum (Conrad). (W.) 

 Plectoccras undatum occidenlalc (Hall). (P.) 

 Plcthocardia? eordiformis (Billings). 

 Plethocardia umbonata Ulrich. (B., L., Le.) 

 Plcurotomaria mohawkensis Miller. (L.) 

 Pleurotomaria? nuclcolata Hall. (L.) 

 Plcurotomaria? obsolcta Hall. (L.) 

 Plcurotomaria quadricarinata Hall. (L.) 

 Podolithus dendrocrinus Sardeson. (B.) 

 Podolithus cucheirocrinus Sardeson. (B.) 

 Podolithus schizocrinus Sardeson. (B.) 

 Porocrinus pentagonius Meek and Worthen. (P.) 

 Prasopora conoidea Ulrich. (B.) 

 Prasopora contigua Ulrich. (B.) 

 Prasopora grandis (Ulrich). (B.) 

 Prasopora Icnticularis Ulrich. (B.) 

 Prasopora simulatrix Ulrich. (B.) 

 Primitia eclata Ulrich. (D.) 

 Primitia duplkata Ulrich. (B.) 

 Primitia mammata Ulrich. (B.) 

 Primitia minutissima Ulrich. (D.) 

 Primitia sanclipauli Ulrich. (B.) 

 Primitiella constricta Ulrich. (L., P.) 

 Primitiella fiUmorcnsis Ulrich. (B.) 

 Primitiella limbata Ulrich. (B.) 

 Primitiella simulans Ulrich. (B.) 

 Priscochiton canadensis (Billings). (Le.) 

 Proboscina tumulosa Ulrich. (B.) 

 Promopalxastcr? wilsoni (Raymond). (L.) 

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

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

 Pterygomctopus callicephalus Hall. (P., B.) 

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

 Pterygomctopus lincolnensis Branson. (A.) 

 Pterygometopus schmidti Clarke. (P.) 

 Rafincsquina altcrnata? Conrad. 



