264 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



CoNCHiDiuM CRASsiRADiATUM Scliucliert. See Conchidium crassoradius. 



Conchidium crassoradius (McChesney). 



Pentamerus crassoradius McChesney, Descr. New Pal. Foss., 1861, p. 87. 

 Conchidium crassiradiatum Schuchert, Bull. U. S. Geol. Surv., 87, 1897, p. 185. 

 Niagaran (Racine): Milwaukee, Wisconsin. 



Conchidium decussatum (Whiteaves). 



Pentamerus decussatus Whiteaves, Canadian Rec. Sci., 1891, p. 295, pi. 3, figs, 



3, 4.— Calvin, Bull. Lab. Nat. Hist., State Univ. Iowa, 11, 1892, p. 164, pi. 



11, figs. 1-3; pi. 12, fig. 2. 

 Conchidium decussatum Hall and Clarke, Pal. New York, 8, pt. 2, 1893, p. 235, 



pi. 65, figs. 1, 2; pi. 66, fig. 15.— Whiteaves, Geol. Surv. Canada, Pal. Foss., 



3, pt. 4, 1906, p. 293, pi. 26, figs. 1, 2. 

 Niagaran: Grand Rapids of the Saskatchewan, etc., Canada. 



Conchidium exponens Hall and Clarke. 



Conchidium exponens Hall and Clarke, Pal. New York, 8, pt. 2, 1895, pi. 66. 

 figs. 6-9; 48th Rep. New York State Mus. for 1895, 2, 1897, p. 366, pi. 10, 

 figs. 20-23; 14th Rep. State Geol. New York for 1894, 1897, p. 366, pi. 10, 

 figs. 20-23. 



Niagaran (Louisville) : Louisville, Kentucky. 



Conchidium georglse Hall and Clarke, 



Conchidium georgisG Hall and Clarke, Pal. New York, 8, pt. 2, 1895, p, 369, pL 



66, figs. 18, 19; 48th Rep. New York State Mus. for 1895, 2, 1897, p. 367, pi. 



11, figs. 10, 11; 14th Rep. State Geol. New. York for 1894, 1899, p. 367, pi. 



11, figs. 10, 11. 

 Clinton: Trenton, Georgia. 



Conchidium greenii Hall and Clarke. 



Conchidium greenii Hall and Clarke, Pal. New York, 8, pt. 2, 1895, pp. 235, 368, 

 pi. 66, figs. 20-22; 48th Rep. New York State Mus. for 1895, 2, 1897, p. 367, 

 pi. 11, figs. 5-7; 14th Rep. State Geol. New York for 1894, 1897, p. 367, pi. 

 11, figs. 5-7. 



Niagaran (Racine) : Near Milwaukee, Wisconsin. 



Conchidium knappi (Hall and ^Tutfield). 



Pentamerus knappi Hall and Whitfield, 24th Rep. New York State Cab. Nat, 

 Hist., 1872, p. 184; 27th Rep., 1875, pi. 10, figs. 10-12.— Nettelroth Kentucky 

 Foss. Shells, Mem. Kentucky Geol. Surv., 1889, p. 55, pi, 28, figs, 1-4. 



Conchidium knappi Hall and Clarke, Pal. New York, 8, pt. 2, 1893, p. 235, pi. 

 64, figs. 11-13. 



Niagaran (Louisville): Louisville, Kentucky; Tennessee, 



Plesiotype.—Csit. No, 51352, U.S.N.M. 



Conchidium laquoatum (Conrad). 



Pentamerus laqueatus Conrad, Proc. Acad. Nat. Sci. Philadelphia, 7, 1855, p. 

 441.— Hall, 42d Rep. New York State Mus. Nat. Hist., 1889, p. 384 (foot- 

 note). 



Pentamerus nobilis Emmons, Man. Geol., 1860, p. 107, fig. 



Conchidium laqueatus Hall and Clarke, Pal. New York, 8, pt. 2, 1893, p. 232, 

 fig. 168; p. 234, pi. 65, figs. 3-9.— Kindle and Breger, 28th Rep. Dep. Geol, 

 Nat. Res. Indiana, 1904, p. 434, pi. 3, figs. 1, 2; pi. 4, fig. 3; pi. 6.— Grabau 

 and Shimer, N. A. Index Fossils, 1, 1907, p. 274. 



Niagaran: Delphi, Huntington, Georgetown, etc., Indiana. 



