556 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Conch. Icon.. XVI, 1868, pi. Lxvm, fig. 351. * B. H. WRKIHT. Check List, 

 1888. P.KTEL, Conch. Sam., Ill, 1890, p. 161. 



* Margaron ( Unio) regularis 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) simus LEA, Syn., 1836, p. 29; 1838, p. 21. 



* Unio ximns LEA, Tr. Am. Phil. Soc., VI, 1838, p. 26, pi. vin, fig. 20 ; * Obs., II, 1838, 



p. 26, pi. vin, fig. 20. *TROSCHKL, Arch, fiir Xaturg., V, 1839, Pt. 2, p. 235. 

 *HANLEY, Test. Moll., 1842, p. 197; " Biv. Shells, 1843, p. 197.-*CATLOW 

 and REEVE, Conch. Norn., 1845, p. 64. CONRAD, Pr. Ac. N. Sci. Phibi., VI, 

 1853, p. 257. *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 49i; * CHENC, 

 111. Conch., 1858, pi. xxi, figs. 4, 4, 46. KCSTER, Conch., Cab. Unio. 1861, 

 p. 248, pi. LXXXIII, fig. 4, p. 262, pi. LXXXVIII, fig. 3.* B. H. WRKJHT, Check 

 List, 1888.* P.ETEL, 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 SOWEKBY, Conch. Icon., XVI, 1868, pi. LXV, fig. 328. 



*? Unio proximus KTSTER, Conch. Cab. Unio, 1861, p. 248, pi. LXXXIII, fig. 4. 



Cumberland and Tennessee river systems; Othcalooga Creek, north- 

 west Georgia. 



t LAMPSILIS PLANCUS Lea. 



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



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

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



* Margaron ( Unio) plancns LEA, Syn., 1870, p. 50. 



Coosa Kiver at Wetumpka, Alabama. 



(Group of Lampsilia subany Hiatus.) 



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 marsupiuin very 

 large; ovisacs numerous; gills large, nearly semicircular. 



LAMPSILIS SUBANGULATUS Lea. 



*Unlo subangulatus LEA, Pr. Am. Phil. Soc., I. 1840, p. 287; * Tr. Am. Phil. Soc., 

 VIII, 1842, p. 29, pi. xm, fig. 23; *Obs., Ill, 1842, p. 47, pi. xm, fig. 23. *H. 

 and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 495. * CHEXU, 111. Conch., 1858, 

 pi. xxix, figs. 2, 2a, 2b. * KUSTER, Conch. Cab. Unio, 1862, p. 278, pi. xciv, 

 fig. 2.* B. H. WRIGHT, Check List, 1888.* P.KTEL, 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. 



* Uniofasciolns CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 249. 



Appalachicola River system, Georgia and Florida. 



1 Spelled sinus, but no doubt intended for simns. 



' 2 Doubtfully distinct from simu*. I have seen only the type. 



