930 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Pachydictya fenestelliformis (Nicholson). 



Ptilodictya fenestelliformis Nicholson, Ann. Mag. Nat. Hist., 4th ser., 15, 1875, 



p. 181, pi. 14, figs. 5-5b; Pal. Ohio, 2, 1875, p. 263, pi. 25, figs. 8-8b; Pal. 



Prov. Ontario, 1875, p. 14. — Lesley, Geol. Snrv. Pennsylvania, Report 



P 4, 1889, p. 827, figs. 

 Phsenopora? fenestelliformis Ulrich, Jour. Cincinnati Soc. Nat. Hist., 5, 1882, pi. 



8, fig. 8. 

 Pachydictya fenestelliformis Ulrich, Geol. Surv. Illinois, 8, 1890, p. 256. 

 Richmond: Blanchester and other localities in Ohio; Wilmington, Illinois; 



?Peterborough, Canada (Nicholson). 



Pachydictya fenestelliformis corticula Ulrich. 



Pachydictya fenestelliformis var. corticula Ulrich, Geol. Surv. Illinois, 8, 1890, p. 



526, pi. 31, fig. 1. 

 Richmond (Fernvale): Wilmington, Illinois. 



Pachydictya fimbriata Ulrich. 



Pachydictya fimbriata Ulrich, 14th Ann. Rep. Geol. Nat. Hist. Surv. Minnesota, 

 1886, p. 75; Geol. Minnesota, 3, 1893, p. 152, pi. 8, figs. 28-34; pi. 9, figs. 13, 

 14.— Grabau and Shimer, N. A. Index Fossils, 1, 1907, p. 159, fig. 214. 



Black River (Decorah): Minneapolis and St. Paul, Minnesota. 



Cotypes.— Cat. No. 43581, U.S.N.M. 



Pachydictya? firma Ulrich. 



Pachydictya firma Ulrich, Geol. Surv. Illinois, 8, 1890, p. 525, pi. 31, figs. 2-2f. 

 Richmond: Wilmington, Illinois (Fernvale); Island of Anticosti (Charleton). 

 Figured sections of cotype.— Cat. No. 43783, U.S.N.M. 



Pachydictya foliata Ulrich. 



Pachydictya foliata Ulrich, 14th Ann. Rep. Geol. Nat. Hist. Surv. Minnesota, 1886, 

 p. 73; Geol. Minnesota, 3, 1893, p. 149, pi. 9, figs. 1-5; pi. 10, figs. 5-10; Zittel's 

 Textb. Pal. (Engl, ed.), 1896, fig. 470 (p. 283).— Sardeson, Jour. Geol., 9, 1901, 

 p. 151, pi. B, figs. 1-3.— Bassler, Zittel-Eastman Textb. Pal., 1913, p. 346, 

 fig. 506. 



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



Cotypes.— Cat. No. 43584, U.S.N.M. 



Pachydictya gigantea Ulrich. 



Pachydictya gigantea Ulrich, Geol. Surv. Illinois, 8, 1890, p. 524, pi. 31, figs. 3-3e. 

 Richmond (Fernvale): Wilmington, Illinois. 

 Figured sections of cotype.— Cat. No. 43784, U.S.N.M. 



Pachydictya hexagonalis Ulrich. 



Pachydictya hexagonalis Ulrich, Contr. Micro- Pal. Cambro-Sil., pt. 2, 1889, p. 42, 



pi. 9, figs. 2-2c— Whiteaves, Pal. Foss., 3, 1895, p. 118. 

 Richmond: Stony Mountain, Manitoba (Stony Mountain); Island of Anticosti 



(Charleton). 

 Fragment of holotype.— Oat. No. 43473, U.S.N.M. 



Pachydictya niagnlpora Ulrich. 



Pachydictya magnipora Ulrich, Contr. Micro-Pal. Cambro-Sil., pt. 2, 1889, p. 43. — 



Whiteaves, Geol. Surv. Canada, Pal. Foss., 3, 1897, p. 161. 

 Trenton: St. Andrews, Manitoba; Kenyon, Minnesota (Prosser). 



Pachydictya obesa Foerste. 



Pachydictya obesa Foerste, Bull. Sci. Lab. Denison Univ., 2, 1887, p. 165; ibid., 



3, 1888, pi. 15, fig. 12; Geol. Surv. Ohio, 7, 1895, p. 599, pi. 28, fig. 12. 

 Upper Medinan (Brassfield) : Dayton, Ohio. 



