556 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxh. 



Conch. Icon.. XVI, 1868, pi. Lxviii, fig. 351.— *B. H. Wright, Check List, 

 1888.— Pj^tel, Conch. Sam., Ill, 1890, p. 161. 



* Margaron ( Unio) rer/ularis Lea, Syn., 1852, p. 29 ; 1870, p. 45. 



Big Pigeon and French Broad rivers, Tennessee; near Bowling Green, 

 Kentucky. 



t LAMPSILIS SIMUS Lea. 



* Margarita ( Unio) simtis Lea, Syn., 1836, p. 29; 1838, p. 21. 



* Unio simiis Lea, Tr. Am. Phil. Soc, VI, 1838, p. 26, pi. viii, fig. 20; ■ Obs., II, 1838, 



p. 26, pi. vin, fig. 20.— *Troschel, Arch, fiir Naturg., V, 1839, Pt. 2, p. 235.— 

 *Hanley, Test. Moll., 1842, p. 197; * Biv. Shells, 1843, p. 197.-*Catlow 

 and Eeeve, Conch. Nom., 1845, p. 64.—* Conrad, Pr. Ac. N. Sci. Phila., VI, 

 1853, p. 257.—* H. and A. Adams, Cen. Rec. Moll., II, 1857, p. 494; * Chenu, 

 111. Conch., 1858, pi. xxi, figs. 4, 4a, ib. — '^ Kuster, Conch., Cab. Unio, 1861, 

 p. 248, pi. Lxxxiii, fig. 4, p. 262, pi. Lxxxviii, fig. 3. — " B. H. Wright, Check 

 List, 1888.—* PiETEL, Conch. Sam., Ill, 1890, p. 167.' 

 *Margaron ( Unio) simus Lea, Syn., 1852, p. 31; 1870, p. 50. 



* Unio notatus Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 253. 



* Unio spatulatus Sowerby, Conch. Icon., XVI, 1868, pi. Lxv, fig. 328. 



*? Unio proximus Kuster, Conch. Cab. Unio, 1861, p. 248, pi. lxxxiii, fig. 4. 



Cumberland and Tennessee river systems; Othcalooga Creek, north- 

 west Georgia. 



t LAMPSILIS PLANCUS Lea.2 



^Unio plancus Lea, Pr. Ac. N. Sci., Phila., IV, 1860, p. 307; * Jl. Ac. N. Sci. 



Phila., V, 1862, p. 81, pLx, fig. 229; * Obs., VIII, 1862, p. 85, pi. x, fig. 229.— 



* B. H.Wright, Check List, 1888. 

 "' Margaron ( Unio) planous Lea, Syn., 1870, p. 50. 



Coosa Eiver at Wetumpka, Alabama. 



(Group of Lampsilis subangulatus.) 



Shell elliptical, inflated, subsolid, drawn to a point behind; that of 

 the female only slightly swollen just behind the central base; bars of 

 the beak sculpture somewhat coarse, feebly double looped; epidermis 

 very smooth, shining, brightly rayed; teeth rather smooth, subcom- 

 pressed ; nacre bluish or purplish. Animal having the marsupium very 

 large; ovisacs numerous; gills large, nearly semicircular, 



LAMPSILIS SUBANGULATUS Lea. 



*f7mo subangulatus Lea, Pr. Am. Phil. Soc, I, 1840, p. 287; * Tr. Am. Phil. Soc, 

 VIII, 1842, p. 29, pi. XIII, fig. 23; * Obs., Ill, 1842, p. 47, pi. xiii, fig. 23.—* H. 

 and A. Adams, Gen. Pec. Moll., II, 1857, p. 495.—* Chenu, 111. Conch., 1858, 

 pi. XXIX, figs. 2, 2a, 2&.—* Kuster, Conch. Cab. Unio, 1862, p. 278, pi. xciv, 

 fig. 2.—* B. H. Wright, Check List, 1888.—* P.etel, Conch. Sam., Ill, 1890, 

 p. 168.—* Simpson, Pr. U. S. Nat. Mus., XVI, 1892, p. 415, pi. lviii, fig. 1. 



*Margaron ( Unio) subangulatus Lea, Syn., 1852, p. 29; 1870, p. 45. 



* Unio fasciolus Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 249. 



Appalachicola Eiver system, Georgia and Florida. 



' Spelled sinus, but no doubt intended for simus. 

 '^Doubtfully distinct from simua. I have seen oulj^ the type. 



