G70 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.SXII. 



(Group of AJasmidonta holntonia.) 



Shell subsolid, beak sculpture rather strong, decidedly doubly 

 looped, surface brownish, slightly rayed; pseudocardinals delicate; 

 laterals uearly or quite wanting. Animal like that of A. calceola. 



t ALASMIDONTA HOLSTONIA Lea. 



* Margaritana hohtonia LEA, Tr. Am. Phil. Soc.,VI, 1838, p. 42, pi. xin, fig. 37; 



*Obs., II, 1838, p. 42, pi. xm, fig. 37.* TROSCHEL, Arch, fiir Nat.,V, 1839, Pt. 2, 

 p. 238. * B. H. WRIGHT, Check List, 1888. * RETEL, Conch. Sam., Ill, 1890, 

 p. 173. 



* Margarita (Margaritana) holstonia LEA, Syn. , 1836, p. 46; 1838, p. 28. 



* Margaron (Margaritana) holstonia LEA, Syn., 1852, p. 44; 1870, p. 70. 



* Strophitus holstonia CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 263. 



* Bapltia holstonia H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 499. 



* Unio holslonianiis HANLEY, Biv. Shells, 1843, p. 213, pi. xxn, tig. 44. *CATLOW 



and REEVE, Conch. Norn., 1845, p. 60. *SOWEKBY, Conch. Icon., XVI, 1868, pi. 

 LXXVI, fig. 398. 



* Margaritana holstoniana KUSTER, Conch. Cab. Unio, 1862, p. 302, pi. c, fig. 4. 



* ? Unio striatu* SOWERBY, Conch. Icon., XVI, 1868, pi. LXXVJII, fig. 407. 



Tennessee River system; headwaters of the Coosa River. 



t ALASMIDONTA GEORGIANA Lea.' 



"Margaritana etoicahensis LEA, Pr. Ac. Nat. Sci. Phila., II, 1858, p. 138; *J1. Ac. 



Nat. Sci. Phila., IV, 1859, p. 227, pi. xxxi, fig. 110; *Obs., VII, 1859, p. 45, pi. 



xxxi, fig. 110.* B. H. WRIGHT, Check List, 1888. 

 *Margaritana (Alasmodonta) etoicahensis CLESSIN, Conch. Cab. Ano., 1875, p. 270, 



pi. LXXXI, figs. 1, 2. 



^Margaritana etoivahensis P.ETEL, Conch. Sam., Ill, 1890, p. 173. 

 *Margaritana georgiana LEA, Pr. Ac. Nat. Sci. Phila., 111,1859, p. 280. B. H. 



WRIGHT, Check List, 1888. 



*Margaron (Margaritana) georgiana LEA, Syn., 1870, p. 68. 

 * Alasmodonta impressa ANTHONY, Am. Jl. Conch., 1, 1865, p. 157, pi. xn, fig. 4. 



Tennessee; Etowah River, Georgia. 



Subgenus BUGIFERA Simpson, 1900. 

 (Type, Alasmodonta marginata Say.) 



Shell elongated, rhomboid, inflated, surface brilliantly painted with 

 radiations, which often break into a dappled or splashed pattern of 

 color ; posterior slope slightly corrugated ; teeth very imperfect ; lat- 

 emls wanting. 



Animal with a thick, smooth, pad like marsupium. Mantle with 

 square spots behind. 



t ALASMIDONTA MARGINATA Say 



* Alasmodonta marginata SAY, Nich. Enc., 1819, No. 1; Am. Conch., VI, 1834. 



* CONRAD, New F. W. Shells, 1834, p. 72." FERUSSAC, Guer. Mag., 1835, p. 

 25.* STIMPSON, Shells of N. Eng., 1851, p.15. * AGASSIZ, Arch. fur. Nat., I, 

 1852, p. 46.-* COXRAD, Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 262. 



1 First called Margaritana elowahenaia by Dr. Lea, but as that name had previously 

 been used by Conrad its author changed it to georgiana. 



