186 SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. |iull.87. 



Conchidium decussatum (Whiteaves). Silurian. 



Peutamerus dccussatius Whiteaves, Cauadian Kecord of Science, 1891, p. 295, pi. 



3, iigs. 3, 4.— Calvin, Bull. Lab. Nat. Hist. State Univ. Iowa, XI, 1892, p. 



164, pi. 11, figs. 1-3; pl. 12, 1ig. 2. 

 Conchidium docussatuni HaJl and Clarke, Pal. New York, VIII, Pt. II, 1893, p. 



235, pl. 65, iigs. 1, 2; ])1. 66, fig. 15. 

 Loe. Grand Kapids of the Saskatchewan, etc., Canada. 



Conchidium exponeum Hall and Clarke. Niagara (Sil,). 



Conchidium exponeus Hall and Clarke, Pal. Now York, VIII, Pt. II, 1895, pl. 66, 



figs. 6-9. 

 Loc. Louisville, Kentucky. 



Conchidium georgiae Hall and Clarke. Clinton (Sil.). 



ConcMdium georgiie Hall and Clarke, Pal. New York, VIII, Pt. II, 1895, p. 369, 



pl. 66, figs. 18, 19. 

 Loc. Trenton, Georgia. 



Conchidium greenei Hall and Clarke. Niagara (Sil.). 



Conchidium greeuii Hall and Clarke, Pal. New York, VIII, Pt. II, 1895, pp. 235, 



368, pl. 66, figs. 20-22. 

 Loc. Near Milwaukee, Wisconsin. 



Conchidium knappi (Hall and Whitfield). Niagara (Sil.). 



Pentamerus knappi Hall and Whitfield, Twenty-fourth Rep. New York State 



Cab. Nat. Hist., 1872, p. 184. — Nettelroth, Kentucky Fossil Shells, Mem. 



Kentucky Geol. Survey, 1889, p. 55, pl. 28, figs. 1-4. 

 Pentamerus ? knappi Hall and Whitfield, Twenty-seventh Rep. New York State 



Cab. Nat. Hist., 1875, pl. 10, figs. 10-12. 

 Conchidium knappi Hall and Clarke, Pal. New York, VIII, Pt. II, 1893, p. 235, 



pl. 64, figs. 11-13. 

 , Loc. Louisville, Kentucky 



Conchidium knighti (Nettelroth). ^Corniferous (Dev.). 



Pentamerus knighti Nettelroth (nou Sowerby), Kentucky Fossil Shells, Mem. 



Kentucky Geol. Survey, 1889, p. 57, pl. 29, figs. 1, 2, 17. 

 Conchidium nettelrothi Hall and Clarke, Pal. New York, VIII, Pt. II, 1893, 



p. 234, pl. 64, figs. 14-16. 

 Loc. Louisville, Kentucky. 

 Ohs. This species is very much like C. nysius and may be identical with it (Ami 



says that C. knighti occurs in the Upper Silurian at Arisaig, Nova Scotia). 



Conchidium laqueatum (Conrad). Niagara (Sil.). 



Pentamerus laqueatus Conrad, Proc. Acad. Nat. Sci. Philadelphia, VII, 1855, 



p. 441. 

 Pentamerus nobilis Emmons, Manual of Geol., 1860, p. 107, figure. 

 Conchidium laqueatus Hall and Clarke, Pal. New York, VIII, Pt. II, 1893, p. 232, 



fig. 168; p. 234, pl. 65, figs. 3-9. 

 Loc. Delphi, Indiana. 



Conchidium littoni Hall. Niagara (Sil.). 



Pentamerus littoni Hall, Pal. New York, III, 1859, p. 262.— Hall and Whitfield, 

 Twenty-fourth Rep. New York State Cab. Nat. Hist., 1872, p. 186;— Twenty- 

 seventh Rep. Ibidem, 1875, pl. 10, figs. 8, 9.— Nettelroth, Kentucky Fossil 

 Shells, Mem. Kentucky Geol. Survey, 1889, p. 58, pl. 27, figs. 12, 13. 



Conchidium littoni Hall and Clarke, Pal. New York, VIII, Pt. II, 1895, pl. 64, 

 figs. 9, 10. 



Loc. Hardin County, Tennessee ; Louisville, Kentucky. 



