1000 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Plectoceras? undatum Continued. 



Trocholites undatus (part) Hyatt, Proc. Boston Soc. Nat. Hist., 22, 1883, p. 267. 

 Eurystomites undatum Hyatt, Proc. Amer. Philos. Soc., 22, 1894, p. 445. Grabau 



and Shimer, N. A. Index Fossils, 2, 1910, p. 69, fig. 1279. 

 Plectoceras undatum Whiteaves, Ottawa Nat., 17, 1903, p. 121; Geol. Surv. 



Canada, Pal. Foss., 3, pt. 4, 1906, p. 305, pi. 37. 

 Euomphalus catilloides Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 



230, figs. 

 Black River: Watertown, New York (Watertown); Kingston, Ontario. 







Plectoceras undatum occidentale (Hall). 



Lituites undatus var. occidentalis Hall, Rep. Supt. Geol. Surv. Wisconsin, 1861, 

 p. 38. Whitfield, Mem. Amer. Mus. Nat. Hist., 1, pt. 2, 1895, p. 63, pi. Ifr, 

 fig. 7; pi. 11; pi. 12, fig. 3. 



Black River (Platteville) : Beloit, Wisconsin; Dixon and Rockton, Illinois; 

 Minneapolis, etc., Minnesota. 



PLECTORTHIS Grabau and Shimer (part). See Eoorthis Walcott. 



PLECTORTHIS Hall and Clarke. Genotype: Orthis plicatella Hall. 



Orthis (group of O. plicatella) Hall, Bull. Geol. Soc. Amer., 1, 1889, p. 20. 



Plectorthis Hall and Clarke, Pal. New York, 8, pt. 1, 1892, pp. 194, 221. Winchell 

 and Schuchert, Geol. Minnesota, 3, 1893, p. 435. Hall and Clarke, llth Ann. 

 Rep. New York State Geol., 1894, p. 266. Cumings, Amer. Jour. Sci., 4th 

 ser., 15, 1903, p. 11. Walcott, Proc. U. S. Nat. Mus., 28, 1905, p. 257. Cum- 

 ings, 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, p. 893. Grabau and 

 Shimer, N. A. Index Fossils, 1, 1907, p. 251. Schuchert, Zittel-Eastman 

 Textb. Pal., 1913, p. 381. 



Austinella (new subgenus of Dinorthis) Foerste, Bull. Sci. Lab. Denison Univ., 

 14, 1909, p. 225. (Genotype: Orthis kankakensis McCheeney.) 



Cyclocoalia Foerste (not Dujardin), Bull. Sci. Lab. Denison Univ., 14, 1909, p. 227. 



Encuclodema Foerste, Bull. Sci. Lab. Denison Univ., 17, 1912, p. 139. (Geno- 

 type: Orthis sordida Hall.) 



Plectorthis aequivalvis (Hall). 



Orthis sequivalvis Hall (not Davidson, 1847), Pal. New York, 1, 1847, p. 120, 



pi. 32, fig. 6. Emmons, Amer. Geology, 1, pt. 2, 1855, p. 196, pi. 9, figs. 6a-c. 



Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 507, figs. 

 Plectorthis sequivalvis Hall and Clarke, Pal. New York, 8, pt. 1, 1892, pp. 194- 



221. Foerste, Bull. Sci. Lab. Denison Univ., 16, 1910, p. 46, pi. 2, figs. 13a, b; 



pi. 6, figs. 17a, b. 

 Maysville (Fairmount): Cincinnati, Ohio, and vicinity. 



Plectorthis aequivalvis latior Foerste. 



Plectorthis equivalvis latior Foerste, Bull. Sci. Lab. Denison Univ., 14, 1910, pi. 6, 



fig. 3, p. 46. 

 Maysville (Fairmount): Cincinnati, Ohio. 



Plectorthis aequivalvis pervagata Foerste. 



Plectorthis equivalvis-pervagata Foerste, Bull. Sci. Lab. Denison Univ., 16, 1910, 



pi. 6, fig. 2, p. 46. 

 Maysville (Fairmount) : Cincinnati, Ohio. 



Plectorthis (Encuclodema) crassiplicata (Foerste). 



Cycloccelia crassiplicata Foerste, Bull. Sci. Lab. Denison Univ., 16, 1910, p. 36, 



pi. 3, figs. 16a-c; pi. 6, figs. 9a-c, lOa-c. 

 Maysville (Fairmount): Cincinnati, Ohio. 



