BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 1005 



PLETHOSPIRA Ulrich. Genotype: Holopea cassina Whitfield. 



Plethospira Ulrich, Geol. Minnesota, 3, pt. 2, 1897, pp. 958, 1008. 



Plethospira arenaria (Billings). 



Murchisonia arenaria Billings, Canadian Nat. Geol., 4, 1859, p. 359, fig. 9; Geol. 



Canada, 1863, p. 120, fig. 33. Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 



1889, p. 426, fig. 

 Holopea arenaria Whitfield, Bull. Amer. Mus. Nat. Hist., 1, 1886, p. 310, pi. 25, 



fig. 5. Seely, Vermont State Geol. Rep., 7, pi. 59, 1910, fig. 5. 

 Plethospira arenaria Ulrich, Geol. Minnesota, 3, 1897, pt. 2, p. 1009 (gen. ref.). 

 Canadian (Beekmantown): Godmanchester, Canada; Fort Cassin, Vermont. 



Plethospira cassina (Whitfield). 



Holopea Cassina Whitfield, Bull. Amer. Mus. Nat. Hist., 1, 1886, p. 310, pi. 25, 



figs. 6, 7. Seely, Vermont State Geol. Rep., 7, 1910, pi. 59, figs. 6, 7. 

 Plethospira cassina Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 1009, fig. 7a. 

 Canadian (Beekmantown): Fort Cassin, Vermont. 

 Plesiotype.Czt. No. 28137, U.S.N.M. (Ulrich). 



Plethospira hyale (Billings). 



Murchisonia hyale Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 33 (adv. 



sheets, 1862). 

 Plethospira hyale Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 1009 (gen. ref.). 



Raymond, Ann. Carnegie Mus., 4, 1908, p. 217. 

 Chazyan or Black River: Phillipsburg, Quebec. 



Plethospira semele (Hall). 



Pleurotomaria semele Hall, Geol. Rep. Wisconsin, 1861, p. 36. Whitfield, Mem. 



Amer. Mus. Nat. Hist., 1, pt. 2, 1895, p. 61, pi. 8, figs. 8-10. 

 Plethospira semele Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 1897, p. 1010, 



pi. 70, figs. 8-10. 



Richmond (Maquoketa) : Maquoketa Creek and Graf, Iowa. 

 PlesiotypeCat. No. 45956, U.S.N.M. (Ulrich and Scofield). 



Plethospira striata Ulrich. 



Plethospira striata Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 1011, pi. 70, fig. 7. 

 Pleurotomaria striata Miller, N. A. Geol. Pal., 2d App., 1897, p. 769 (gen. ref.). 

 Richmond (Waynesville) : Hanover, Butler County, Ohio. 

 Holotype.-Vzt. No. 45957, U.S.N.M. 



PLEURACANTHUS Milne-Edwards. See Dalmanites Barrande. 

 PLEUROCYSTIS Haeckel. See Pleurocystites Billings. 



PLEUROCYSTITES Billings. Genotype: P. squamosus Billings. 



Pleurocystites Billings, Canadian Jour., 2, 1854, p. 251; Geol. Surv. Canada, Rep. 

 Progr. for 1853-1856, 1857, p. 284. Chapman, Canadian Jour., n. s., 2, 1857, p. 

 303. Billings, Geol. Surv. Canada, dec. 3, 1858, p. 46. Hall, Pal. New York, 

 3, 1859, p. 152. Chapman, Expos. Min. Geol. Canada, 1864, p. 109. Billings, 

 Amer. Jour. Sci. Arts, 2d ser., 48, 1869, p. 77; Canadian Nat., n. s., 4, 1869, 

 p. 288, fig. 5; Ann. Mag. Nat. Hist., 4th ser., 5, 1870, p. 260; Pal. Foss., Geol. 

 Surv. Canada, 2, pt. 1, 1874, p. 97, figs. 54, 55; p. 98. Zittel, Handb. Pal., 1, 

 1879, p. 422. Miller, N. A. Geol. Pal., 1889, p. 272. Jaekel, Stammesg. 

 Pelmat., 1, Thecoida u. Cystoidea, Berlin, 1899, p. 231. Zittel-Eastman 

 Textb. Pal., 1, 1900, p. 186. Zittel, Grundzuge Pal., 1, 1910, p. 187. Grabau 

 and Shimer, N. A. Index Fossils, 2, 1910, p. 465. Springer, Zittel-Eastman 

 Textb. Pal., 2d ed., 1913, p. 154. 



