996 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Plectambonites glaber Shaler. 



Plectambonites glabra Shaler, Bull. Mus. Comp. Zool., 1, 1865, p. 64. 

 Plectambonites glaber Shaler, Mem. Geol. Surv. Kentucky, 1, 1876, p. 29. 

 Leptsena glabra Foerste, Proc. Boston Soc. Nat. Hist., 24, 1889, p. 294. 

 Anticostian: Island of Anticosti. 



Plectambonites ininnesotensis (Sardeson). 



Leptsena minnesotensis Sardeson, Minnesota Acad. Nat. Sci., 3, 1892, p. 329, pi. 4, 



figs. 24, 25. 

 Trenton (Prosser): Goodhue County, etc., Minnesota. 



Plectambonites pisum Ruedemann. 



Plectambonites pisum Reudemann, Bull. New York State Mus., 49, 1902, p. 19, 

 pi. 1, figs. 8-20.— Bassler, Bull. Virginia Geol. Surv., 2a, 1909, pi. 3, figs. 17, 18. 

 Mohawkian: Rysedorph Hill and Moordener Kill, New York (Rysedorph); 

 Pennsylvania, Maryland, and Virginia (Chambersburg). 



Plectambonites plicatellus (Ulrich). 



Leptsena plicatella Ulrich, Jour. Cincinnati Soc. Nat. Hist., 1, 1879, p. 15, pi. 7, 



fig. 12. 

 Plectambonites plicatella Hall and Clarke, Pal. New York, 8, pt. 1, 1892, pi. 15A, 



figs. 34, 35.— Foerste, Bull. Sci. Lab. Denison Univ., 17, 1912, p. 122, pi. 1, 



figs. 8a, b. 

 Eden: Cincinnati, Ohio, and vicinity (Fulton); New York (Indian Ladder). 



Plectambonites precosis (Sardeson). 



Leptsena precosis Sardeson, Minnesota Acad. Nat. Sci., 3, 1892, p. 329, pi. 4, figs. 



26-28. 

 Richmond (Maquoketa): Fillmore County, Minnesota. 



Plectambonites productus Hall and Clarke. 



Plectambonites producta Hall and Clarke, Pal. New York, 8, pt. 2, 1895, p. 360, 



pi. 84, figs. 23-25; 48th Rep. New York State Mus., 2, p. 354, pi. 6, figs. 11, 12; 



14th Rep. State Geol. New York for 1894, p. 354, pi. 6, figs. 11, 12. 

 Niagaran: Yellow Springs, Ohio. 



Plectambonites recedens (Sardeson). 



Leptsena recedens Sardeson, Minnesota Acad. Nat. Sci., 3, 1892, p. 330, pi. 4, 



figs. 29-32; Amer. Geol., 19, 1897, p. 182. 

 Richmond (Maquoketa) : Fillmore County, Minnesota. 



Plectambonites ehomboidalis Keyes. See Leptsena rhomboidalis. 



Plectambonites rugosus (Meek). 



Leptsena rugosa James, Cat. Foss. Cincinnati Group, 1871. 



Leptsena sericea var. rugosa Meek, Pal. Ohio, 1, pt. 2, 1873, pi. 5, figs. 3f, g, h. 



Plectambonites rugosa Foerste, Bull. Sci. Lab. Denison Univ., 17, 1912, p. 123, 



pi. 1, figs. 7a-c; pi. 10, figs. 7a-d. 

 Leptaena aspera James, Cincinnati Quart. Jour. Sci., 1, 1874, p. 151. 

 Plectambonites sericeus var. asper Ruedemann, Bull. New York State Mus., 49, 



1901, p. 18, pi. 1, figs. 6, 7; ibid., 8, p. 525. 

 Eden: Cincinnati, Ohio, and vicinity. 



Plectambonites rugosus clarksvillensis Foerste. 



Plectambonites rugosus clarksvillensis Foerste, Bull. Sci. Lab. Denison Univ., 17, 



1912, p. 127. 

 Richmond (Waynesville and Liberty): Ohio, Indiana, and Kentucky. 



