BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 1075 



Ptilograptus tenulssimus Ruedemann. 



Ptilograptus temiissimus Ruedemann, Mem. New York State Mus., 7, pt. 1, 1904, 



p. 591, pi. 4, fig. 13. 

 Canadian (Deepki.ll, Didymograptus bifidus zone): Deepkill, Rensselaer County. 



New York. 



PTILOPORELLA Hall. Genotype: Fenestella (Ptiloporella) laticrescens Hall. 



Ptyloporella Hall, Rep. State Geol. New York for 1884, 1885, p. 36. 



Ptiloporella Hall and Simpson, Pal. New York, 6, 1887, p. xxiv. Miller, N. A. 

 Geol. Pal., 1889, p. 319. Simpson, 13th Ann. Rep. State Geol. New York for 

 1893, 1895, pp. 690, 704, 725; 47th Ann. Rep. New York State Mus., pp. 884, 

 898, 919 (on p. 704, p. 898 of Mus. Rep., Simpson has inadvertently inter- 

 changed the terms Ptiloporella and Ptiloporina) ; 14th Ann Rep. State Geol. 

 New York for 1894, 1897, pp. 506, 521. Nickles and Bassler, Bull. U. S. Geol. 

 Surv., 173, 1900, pp. 40, 383. Bassler, Bull. U.S. Geol. Surv., 292, 1906, p. 51. 



Pinnaporina Simpson, 13th Ann. Rep. State Geol. New York for 1893, 1895, p. 705 

 (not p. 725=Ptiloporina); 47th Ann. Rep. New York State Mus., p. 899 (not p. 

 919). 



Pinnaporella Simpson, 14th Ann. Rep. State Geol. New York for 1894, 1897, pp. 

 507, 521. 



Ptiloporella nervata (Nicholson). 



Fenestella nervata Nicholson, Pal. Ohio, 2, 1875, p. 264, pi. 25, figs. 11, lla. 

 Ptiloporella nervata Miller, N. A. Geol. Pal., 1889, p. 319. Bassler, Bull. U. S. 



Geol. Surv., 292, 1906, p. 51, pi. 24, figs. 24, 25; pi. 26, figs. 5, 6. 

 Niagaran: Cedarville, Ohio; Lockport, New York; Grimsby, Thorold, and Ham- 



ilton, Ontario (Rochester); Osgood, Indiana (Osgood). 

 Plesiotypes.Czt. No. 35743, TJ.S.N.M. 



PTILOTRTPA Ulrich. Genotype: P. obliquata Ulrich. 



Ptliotrypa Ulrich, Geol. Surv. Illinois, 8, 1890, p. 393. (Ulrich, in press) Miller, 



N. A. Geol. Pal., 1889, p. 320. Simpson, 14th Ann. Rep. State Geol. New 



York for 1894, 1897, p. 542. Pocta, Syst. Sil. Centre Boheme, 8, pt. 1, 1894, 



p. 17. Nickles and Bassler, Bull. U. S. Geol. Surv., 173, 1900, p. 46. 



Ptliotrypa obliquata Ulrich. 



Ptilotrypa obliquata Ulrich, Geol. Surv. Illinois, 8, 1890, p. 531, pi. 30, figs. 1-le. 

 Simpson, 14th Ann. Rep. State. Geol. New York for 1894, 1897, figs. 100-103 



(p. 542). 



Richmond (Fern vale) : Wilmington, Illinois; Tennessee. 

 No. 43787, U.S.N.M. 



PTYCHASPIS Hall. Genotype: Dikelocephalus miniscaensis Owen. 



Ptychaspis Hall, 16th Ann. Rep. New York State Cab. Nat. Hist., 1863, p. 170. 



Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 198. Hall, Trans. Albany 



Inst., 5, 1867, p. 160. Zittel, Handb. Pal., 2, 1885, p. 602. Miller, N. A. 



Geol. Pal., 1889, p. 564. 



PTYCHASPIS CYLINDRICUS Billings. See Arionellus cylindricua. 



Ptychaspis? pauper (Billings). 



Dikelocephalus pauper Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 200. 

 Dicellocephalus pauper Matthew, Trans. Royal Soc. Canada, 10, sec. 4, 1893, p. 11, 



footnote. 



Ptychaspis? pauper Walcott, Smiths. Misc. Coll., 57, No. 13, 1914, p. 352 (gen. ref.). 

 Ozarkian? (Levis erratics): Point Levis, Quebec. 



