950 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Pentamerella(?) compressa Ringueberg. 



Pentamerella compressa Ringueberg, Bull. Buffalo Soc. Nat. Sci., 5, 1886, p. 15, 



pi. 2, fig. 4. Schuchert, Bull. U. S. Geol. Surv., 87, 1897, p. 302. 

 Clinton (Rochester): Lockport, New York. 



Observation. May be a pathologic or compressed specimen of Spirifer crispus or 

 S. sulcatus (Schuchert). 



PENT AMEEOC ERAS Hyatt. Genotype: Gomphoceras minim Barrando. 



Pentamorion Barrande, Sil. Syst. Boheme, 2, 1867, p. 265. 

 Pentameroceras Hyatt, Proc. Boston Soc. Nat. Hist., 22, 1883, p. 278. Foord, 



Cat. Foss. Ceph. British Mus., 1, 1888, p. 245. Newell, Proc. Boston Soc. 



Nat. Hist., 23, 1888, p. 483. 



Pentameroceras mirum (Barrande). 



Gomphoceras mirum Barrande, Syst. Sil. Boheme, 2, 1867, p. 310, pis. 82 and 91. 

 Pentameroceras mirum Newell, Proc. Boston Soc. Nat. Hist., 1888, p. 483. 

 Silurian: Bohemia; (?)Delphi, Indiana. 



PENTAMERUS Sowerby. Genotype: P. Isevis Sowerby. 



Pentamerus Sowerby, Mineral Conch., 1, 1813, p. 76. Pictet, Traite de Pal., 2d ed., 

 4, 1857, p. 52. Chapman, Canadian Jour., n. s., 3, 1858, p. 162; 7, 1862, p.115; 

 Expos. Min. and Geol. Canada, 1864, p. 118. Zittel, Handb. Pal., 1, 1880, 

 p. 693. Miller, N. A. Geol. Pal., 1889, p. 361. Hall and Clarke, Pal. New 

 York, 8, pt. 2, 1895, p. 236. Koken, Die Leitfossilien, Leipzig, 1896, p. 244. 

 Hall and Clarke, 13th Ann. Rep. New York State Geol., 1895, p. 844. 

 Grabau, Bull. Buffalo Soc. Nat. Sci., 7, 1901, p. 190; Bull. New York State 

 Mus., 45, 1901, p. 190. Grabau and Shimer, N. A. Index Fossils, 1, 1907, 

 p. 275. Schuchert, Zittel-Eastman Textb. Pal., 1900, p. 321; 2d. ed., 1913, 

 p. 395. 



PENTAMERUS ARCUOSUS McChesney. See Clorinda arcuosa. 

 PENTAMERUS BARRANDI Billings. See Virgiana barrandei. 

 PENTAMERUS BEAUMONTI Castelnau. See Pentamerus oblongus. 

 PENTAMERUS BISINUATUS McChesney. See Pentamerus oblongus bisinuatus. 

 PENTAMERUS BREVIROSTRIS Hall. See Anastrophia brevirostris. 



Pentamerus circularis Weller. 



Pentamerus circularis Weller, Geol. Surv. New Jersey, Pal. 3, 1903, p. 233, pi. 



20, figs. 17-19. 

 Helderbergian (Decker Ferry): Two miles south of Tristates, New York. 



PENTAMERUS CHICAGOENSIS Winchell and Marcy. See Clorinda ventricosa. 

 PENTAMERUS COLLETTI Miller. See Conchidium colletti. 

 PENTAMERUS COMPLANATUS Nettelroth. See Conchidium tenuicoslatum. 

 PENTAMERUS CONCHIDIUM Emerson. See Conchidium biloculare. 

 PENTAMERUS COPPINGERI Etheridge. See Gypi^ula coppingeri. 

 PENTAMERUS CRASSORADIUS McChesney. See Conchidium crassoradius. 

 PENTAMERUS DECUSSATUS Whiteaves. See Conchidium decussatum. 



