BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 1001 



Plectorthis dichotoma Hall and Clarke. See Plectorthis neglecta. 



Plectorthis dichotoma Hall. 



Orthis dichotoma Hall, Pal. New York, 1, 1847, p. 125, pi. 32, fig. 13.— Emmons, 

 Amer. Geology, 1, pt. 2, 1855, p. 195, pi. 9, fig. 13.— Lesley, Geol. Surv. Penn- 

 sylvania, Rep. P 4, 18S9, p. 513, figs. 

 Plectorthis dichotoma(?) Foerste, Bull. Sci. Lab. Denison Univ., 14, 1910, pi. 5, 



fig. 16; Bull. 16, p. 49. 

 Maysville: Cincinnati, Ohio. 



Observation. — This species may be the same as Plectorthis neglecta, but as 

 the type is lost the name may as well be abandoned. 



Plectorthis ella Hall and Clarke. See Plectorthis (Encuclodema) sordida. 



Plectorthis exfoliata (Raymond). 



Hebertella exfoliata Raymond, Amer. Jour. Sci., 20, 1905, p. 370. 



Plectorthis exfoliata Raymond, Ann. Carnegie Mus., 7, 1911, p. 238, pi. 35, figs. 



11, 12. 

 Chazyan (Day Point): Chazy, Valcour, and Valcour Island, New York; Isle la 

 Motte, Vermont. 



Plectorthis flssicosta (Hall). 



Orthis fissicosta Hall, Pal. New York, 1, 1847, p. 121, pi. 32, fig. 7.— Emmons, 

 Amer. Geology, 1, pt. 2, 1855, p. 195, pi. 9, fig. 7a, b— Meek, Pal. Ohio, 1, 

 1873, p. 106, pi. 8, fig. 6.— Miller, Cincinnati Quart. Jour. Sci., 2, 1875, p. 

 30.— Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 516, figs. 



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

 221.— Grabau and Shinier, N. A. Index Fossils, 1, 1907, p. 252, fig. 300c-d.— 

 Foerste, Bull. Sci. Lab. Denison Univ., 14, 1909, p. 221, pi. 4, figs. 5a, 5b; 

 ibid., 16, 1910, p. 48, pi. 6, fig. 4; ibid., 17, 1912, p. 130, pi. 8, fig. 4. 



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



Plectorthis flssicosta triplicatella (Meek). 



Orthis triplicatella Meek, American Jour. Sci., 4, 1872, p. 281; Pal. Ohio, 1, 1873, 



p. 109, pi. 8, fig. 8.— Miller, Cincinnati Quart. Jour. Sci., 2, 1875, p. 31. 

 Orthis plicatella var. triplicatella Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 



1889, p. 531, figs. 

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

 Plectorthis plicatella var. triplicatella Cumings, 32d Ann. Rep., Dep. Geol. Nat. 



Res. Indiana, 1908, p. 925, pi. 36, figs. 4-4b. 

 Plectorthis fissicosta var. triplicatella Foerste, Bull. Sci. Lab. Denison Univ., 14, 



1909, p. 222. 

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

 Cotypes.—Cat. No. 15945, U.S.N.M. 



Plectorthis jamesi (Hall). 



Orthis jamesi Hall, 14th Rep. New York State Cab. Nat. Hist., 1861, p. 89 — 

 Miller, Cincinnati Quart, Jour. Sci., 2, 1875, p. 33.— Hall and Whitfield, 

 Pal. Ohio, 2, 1875, p. 77, pi. 1, figs. 21, 22.— Lesley, Geol. Surv. Pennsylvania, 

 Rep. P 4, 1889, p. 521, figs. 



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

 Foerste, Bull. Sci. Lab. Denison Univ., 16, 1910, p. 50, pi. 2, figs. 9a, b. 



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



Plectorthis (Austinella) kankakensis (MeChesney). 



Orthis kankakensis MeChesney, New Pal. Fossils, 1861, p. 77; Trans. Chicago 

 Acad. Sci., 1, 1868, p. 29, pi. 9, fig. 3. 



