BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 931 



Pachydietya occidentalis Ulrich. 



Pachydictya occidentalis Ulrich, 14th Ann. Rep. Geol. Nat. Hist. Surv. Minne- 

 sota, 1886, p. 75; Geol. Minnesota, 3, 1893, p. 151, pi. 8, figs. 20-27; pi. 9, 

 figs. 6-10. 



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



Cotypes.C&t. No. 43582, U.S.N.M. 



Pachydictya pumila Ulrich. 



Pachydictya pumila Ulrich, Jour. Cincinnati Soc. Nat. Hist., 12, 1890, p. 186, 



fig. 11; Geol. Minnesota, 3, 1893, p. 157, pi. 10, figs. 1-4; pi. 8, figs. 4, 5. 

 Rhinidictya humilis Ulrich, Jour. Cincinnati Soc. Nat. Hist., 12, 1890, p. 185, 



fig. 10. 



Trenton: Cannon Falls, Minnesota (Prosser); Trenton Falls, New York. 

 Cotypes.C&t. No. 43702, U.S.N.M. 



Pachydictya pumila sublata Ulrich. 



Pachydictya pumila var. sublata Ulrich, Geol. Minnesota, 3, 1893, p. 158. 

 Trenton (Prosser) : Cannon Falls, Minnesota. 

 Cotypes.C&t. No. 43585, U.S.N.M. 



Pachydictya robusta Ulrich. 



Pachydictya robusta Ulrich, Jour. Cincinnati Soc. Nat. Hist., 5, 1882, p. 173, 



pi. 8, figs. lOa-c. 



Chazyan (Ottosee): Knoxville, Tennessee. 

 Cotypes.C&t. No. 43701, U.S.N.M'. 



PACHYDICTYA (RHINIDICTYA) RUDIS Foerste. See Pachydictya crassa. 

 PACHYDICTYA RUSTIC A Ulrich. See Pachydictya crassa. 

 PACHYDICTYA SCITULA Ulrich. See Pachydictya crassa. 



Pachydictya? splendens Ulrich. 



Pachydictya splendens Ulrich, Geol. Surv. Illinois, 8, 1890, p. 523, pi. 31, fig. 



2g;pl. 32, figs. 1-lb. 



Richmond (Fernvale) : Wilmington, Illinois. 

 Figured section of cotype Cat. No. 43785, U.S.N.M. 



Pachydictya triserialis Ulrich. 



Pachydictya triserialis Ulrich, Jour. Cincinnati Soc. Nat. Hist., 12, 1890, p. 187, 



fig. 12; Geol. Minnesota, 3, 1893, p. 159, pi. 10, figs. 11-14. 

 Trenton: Montreal, Quebec. 

 Cotypes.C&t. No. 43703, U.S.N.M. 



Pachydictya turgida Foerste. 



Pachydictya turgida Foerste, Bull. Sci. Lab. Denison Univ., 2, 1887, p. 164; 

 ibid., 3, 1888, pi. 15, fig. 11; Geol. Surv. Ohio, 7, 1895, p. 599, pi. 28, fig. 11. 

 Upper Medinan (Brassfield): Dayton and Fair Haven, Ohio. 



PACHYDOMELLA Ulrich. Genotype: P. tumida Ulrich. 



Pachydomella Ulrich, Jour. Cincinnati Soc. Nat. Hist., 13, 1891, pp. 197, 198. 

 Miller, N. A. Geol. Pal., 1st App., 1892, p. 710. 



Pachydomella longula Ulrich and Bassler. 



Pachydomella longula Ulrich and Bassler, Maryland Geol. Surv., Low. Dev,, 1913, 



p. 542, pi. 98, figs. 29-31. 



Helderbergian (Keyser): Cumberland, Maryland. 

 Holotype.C&t. No. 53289, U.S.N.M. 



