1026 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Poterioceras tyrrelli Parks. 



Poterioceras tyrrelli Parks in Tyrrell, 22d Hep. Ontario Bur. Mines, 1913, p. 33. 

 Mohawk ian or Richmond: Shamattawa River, Manitoba. 



POTERIOCRINITES (DENDROCRiNus) of authors. See Dendrocrinus Hall. 



POTERIOCRINITES (DENDROCRINUS) POLYDACTYLus Meek. See Cupulocrinus poly- 

 dactylus. 



POTERIOCRINUS of authors. See Dendrocrinus Hall. 

 POTERIOCRINUS? CALYX Hall. See Ampheristocrinua calyx. 

 POTERIOCRINUS PISIPORMIS Roemer. See Lecanocrinus pisiformis. 



POTERIOCRINUS (DENDROCRINUS) POLYDACTYLUS Meek. See Cupulocrinus polydac- 



tylus. 



PRASOPORA Nicholson and Etheridge, jr. 



Genotype: P. grayse Nicholson and Etheridge, jr. 



Prasopora Nicholson and Etheridge, jr., Ann. Mag. Nat. Hist., 4th ser., 20, 1877, 

 p. 38; Mon. Sil. Foss. Girvan Diet., 1878, p. 44. Nicholson, Pal. Tabulate 

 Corals, 1879, p. 324. Zittel, Handb. Pal., 1, 1880, p. 616. Nicholson, Genus 

 Monticulipora, 1881, pp. 102, 202. Ulrich, Jour. Cincinnati Soc. Nat. Hist., 

 5, 1882, p. 153. Foord, Contr. Micro-Pal. Cambro-Sil., 1883, p. 10. Roemer, 

 Leth. geog., pt. 1, Leth. Pal., 1883, p. 472. Waagen and Wentzel, Mem. Geol. 

 Surv. India, Pal. Indica, 13th ser., 1886, p. 909. Foerste, Bull. Sci. Lab. Den- 

 ison Univ., 2, 1887, p. 170. Miller, N. A. Geol. Pal., 1889, p. 201. Ulrich, 

 Geol. Surv. Illinois, 8, 1890, p. 371. Reminder, Amer. Geol., 6, 1890, pp. 

 116-119; Geol. Minnesota, 3, 1893, p. 244; (part) Zittel's Textb. Pal. (Engl. 

 ed.), 1896, pp. 104, 273. Simpson, 14th Ann. Rep. State Geol. New York for 

 1894, 1897, p. 586. Nickles and Bassler, Bull. U. S. Geol. Surv., 173, 1900, 

 p. 29. Grabau and Shimer, N. A. Index Fossils, 1, 1907, p. 129. Cumings, 

 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, p. 753. Bassler, Zittel- 

 Eastman Textb. Pal., 1913, p. 332. 



Prasopora afflnis Foord. 



Prasopora affinis Foord, Contr. Micro-Pal. Cambro-Sil., 1883, p. 12, pi. 3, figs. 



2-2c. Ulrich, Geol. Surv. Illinois, 8, 1890, fig. 7c (p. 318). 

 Trenton: Ottawa, Ontario; Cannon Falls and Berne, Minnesota (Prosser). 



PRASOPORA CALYCULA Ulrich. See Aspidopora calycula. 

 PRASOPORA CONICA Simpson. See Prasopora conoidea. 



Prasopora conoidea Ulrich. 



Prasopora conoidea Ulrich, 14th Ann. Rep. Geol. Nat. Hist. Surv. Minnesota, 1886, 



p. 87; Geol. Minnesota, 3, 1893, p. 249, pi. 16, figs. 11-15. Cumings, Bull. 



Geol. Soc. Amer., 23, 1912, p. 370, pi. 22, figs. 33-39; pi. 21, figs. 21, 22; pi. 



19, figs. 1-6, 9. 

 Prasopora conica (in error for conoidea) Simpson, 14th Ann. Rep. State Geologist 



New York for 1894, 1897, fig. 170 (p. 587). 



Black River (Decorah): Cannon Falls, St. Paul, etc., Minnesota. 

 Cofypes. Cat. No. 43592, U.S.N.M. 



Prasopora contigua Ulrich. 



Praspora contigua Ulrich, 14th Ann. Rep. Geol. Nat. Hist. Surv. Minnesota, 



1886, p. 87; Geol. Minnesota, 3, 1893, p. 249, pi. 16, figs. 24-26. J. F. James, 



Jour Cincinnati Soc. Nat. Hist., 16, 1894, p. 180. 

 Black River (Decorah): Goodhue and Dakota Counties, Minnesota. 

 Figured sections of holotype.Csit. No. 43590, U.S.N.M. 



