978 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Piauodema subsequata (Conrad). 



Orthis subsequata Conr^t, Proc. Acad. Nat. Sci. Philadelphia, 1, 1843, p. 333. — 



Hall, Pal. New York, 1, 1847, p. 118, pi. 32, fig. 2; Geol. Wisconsin, 1, 1862, 



, p. 42, figs. 1-3, and p. 436; 2d Ann. Rep. New York State Geol., 1883, pi. 34, 



figs. 19-24.— Emmons, Amer. Geology, 1, pt. 2, 1855, p. 194, pi. 9, f. 2.— 



Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 533, figs. 



Orthis minneapolis N. H. Winchell, 8th Ann. Rep. Geol. Nat. Hist. Surv. Minne- 

 sota, 1880, p. 63. 



Orthis perveta Hall, 2d Ann. Rep. New York State Geol., 1883, pi. 34, figs. 17, 

 18 (?16). 



Dalmanella subcequata Hall and Clarke, Pal. New York, 8, pt. 1, 1892, pp. 194, 

 207, 224, pi. 5C, figs. 6-11.— Weller, Geol. Surv. New Jersey, Pal., 3, 1903, 

 p. 156, pi. 10, figs. 3, 4.— Grabau and Shimer, N. A. Index Fossils, 1, 1907, 

 p. 261, fig. 311f-h. 



Dalmanella perveta Hall and Clarke, ibid., 1892, p. 224, pi. 5C, figs. 13, 14. 



Orthis (Dalmanella) subsequata Winchell and Schuchert, Geol. Minnesota, 3, 

 1893, p. 446, pi. 33, figs. 30-36. 



Black River: Mineral Point, Wisconsin; Minneapolis, St. Paul, Cannon Falls, 

 Fountain, etc., Minnesota; Decorah and McGregor, Iowa; Auburn, Lincoln 

 County, Missouri; Montreal, Canada; New Jersey; Kentucky; etc. 



Stones River (Pierce — Lebanon) : Central Tennessee. 



Pianodema subsequata circularis (N. H. Winchell). 



Orthis circularis N. H. Winchell, 8th Ann. Rep. Geol. Nat. Hist. Surv. Minnesota, 



1880, p. 66. 

 Orthis (Dalmanella) subsequata var. circularis Winchell and Schuchert, Geol. 



Minnesota, 3, 1893, p. 452, pi. 33, figs. 46, 47. 

 Black River: Minneapolis, Cannon Falls, etc., Minnesota (Decorah); High Bridge, 



Kentucky (Lowville). 



Pianodema subsequata conradi N. H. Winchell. 



Orthis conradi N. H. Winchell, 8th Ann. Rep. Geol. Nat. Hist. Surv. Minnesota, 



1880, p. 68. 

 Orthis (Dalmanella) subsequata var. conradi Winchell and Schuchert, Minnesota 



Geol. Surv., 3, 1893, p. 449, pi. 33, figs. 37-39. 

 Black River: Minneapolis, Minnesota; Decorah, Iowa; Janesville and Beloit, 



Wisconsin (Platteville); Montreal, Canada. 



Pianodema subsequata gibbosa (Billings). 



Orthis gibbosa Billings, Geol. Surv. Canada; Rep. Progr. for 1856, 1857, p. 296. 



(Not Billings, 1859=Hebertella vulgaris Raymond.) 

 Dalmanella gibbosa Hall and Clarke, Pal. New York, 8, pt. 1, 1892, p. 224. 

 Orthis (Dalmanella) subsequata var. gibbosa Winchell and Schuchert, Geol. 



Minnesota, 3, 1893, p. 451, pi. 33, figs. 43-45. 

 Black River: Near Ottawa and Bellville, Canada; Minneapolis, Cannon Falls, 



etc., Minnesota; Decorah, Iowa; Mineral Point, Wisconsin; Island of Montreal; 



and Pallideau Islands, Lake Huron. 



Pianodema subsequata perveta (Conrad). 



Orthis perveta Conrad, Proc. Acad. Nat. Sci. Philadelphia, 1, 1843, p. 333.— Hall, 

 Pal. New York, 1, 1847, p. 120, pi. 32, fig. 5— Emmons, Amer. Geology, 1, 

 pt. 2, 1855, p. 194, pi. 9, fig. 5.— Hall, Geol. Wisconsin, 1, 1862, p. 42, fig. 7.— 

 Billings, Geol. Canada, 1863, p. 130, fig. 57.— Hall, 36th Rep. New York State 

 Mus. Nat. Hist., 1884, p. 75, pi. 3, fig. 6— Lesley, Geol. Surv. Pennsylvania, 

 Rep. P 4, 1889, p. 529, 6 figs. 



