734 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



fUNIO SPISSUS Lea, 



" Unio spissus Lea, Pr. Ac. Nat. Sci. Phila., Ill, 1859, p. 112; * Jl. Ac. Nat. Sci. 

 Phila., IV, 1859, p. 208, pi. xxv, fig. 89 ; * Obs., VII, 1859, p. 26, pi. xxv, fig. 89.— 



* SowERBY, Concli. Icon., XVI, 1868, pi. Lxxxviii, fig. 476.—* B. H. Wright, 

 Check List, 1888.— * P^tel, Conch. Sam., Ill, 1890. p. 168. 



*Margaron {Unto) spissus Lea, Syn., 1870, p. 41. 



Georgia-. 



{G^TOvq) of Unio fislierianus.) 



Shell elongated, rather tliiu, subcompressed, pointed behind and 

 sometimes slightly biangulate ; posterior ridge generally well developed ; 

 beaks low, the sculpture consisting of a few coarse, slightly irregular 

 ridges which run nearly parallel with the growth lines, generally 

 heavier Avhere they cross the posterior ridge; epidermis sometimes 

 rayed, shining; pseudocardinals usually compressed; laterals long, 

 straight, and lamellar; beak cavities very shallow and containing two 

 or three dorsal scars at some distance behind the beaks; muscle scars 

 well marked, the j)Osterior ones elongated; nacre generally dull. Ani- 

 mal with the gills greatly elongated, inner the larger, more or less free 

 from the abdominal sac ; marsupium occupying nearly or quite the whole 

 length of the outer brauchije; palpi elongated; mantle thin, thicker on 

 the edge. 



tUNIO LANCEOLATUS Lea. 



* Unio lanceolaius Lea, Tr. Am. Phil. Soc, 1828, p. 266, pi. in, fig. 2; * Obs., 1, 1834, 



p. 8, pi. Ill, fig. 2.— "Conrad, New F. W. Shells, 1834, p. 70. — ^Ferussac, 

 Guer. Mag., 1835, p. 26.—=^ Conrad, Monog. Ill, 1836, p. 32, pi. xiv., fig. 2.— 

 ^Hanley, Test. Moll., 1842, p. 204; *Biv. Shells., 1843, p. 204, pi. xx, tig. 60; 

 XXII, fig. 26. — *Catlow and Reeve, Conch. Nom., 1845, p. 60. — * Conrad, Pr. 

 Ac. Nat. Sci. Phila., VI, 1853, p. 251.— ''H. and A. Adams, Gen. Eec. Moll., II, 

 1857, p. 491.— *Chenu, 111., Conch. 1858, pi. viii, fig. 1, la, 1&.— *Kuster, 

 Conch. Cab. Unio., 1861, p. 204, pi. Lxviii, fig. 4.—* Sowerby, Conch. Icon., 

 XVT, 1866, pi. XLiii, fig. 236.—* B. H. Wright, Check List, 1888.—" P^tel, 

 Conch. Sam., Ill, 1890, p. 156. 



* Margarita ( Unio) lanceolatus Lea, Syn., 1836, p. 35; 1838, p. 24. 

 *Margaron ( Unio) lanceolatus Lea, Syn., 1852, p. 36; 1870, p. 57. 



* Unio lanceolata DKSTiATKS, Enc. M6th., II, 1830, p. 585; *An. sans Vert., 2d ed., 



VI, 1835, p. 547 ; 3d ed., II, 1839, p. 672. 



North Carolina; Yirginia. 



fUNIO VIRIDULUSLea.i 



* Unio viridiilus Lea, Pr. Ac. Nat. Sci. Phila., VII, 1863, p. 193; ^Jl. Ac.Nat. Sci. 



Phila., VI, 1866. p. 10, pi. iii, fig. 17; * Obs., XI, 1867, p. 14, pi. iii, fig. 17.— 



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



^ Mar gar on {Unio) viridttlus Lea, Syn., 1870, p. 58. 



Neuse Eiver, near Ealeigh, North Carolina. 



' A young shell, no doubt, which in texture and appearance is much like U. lanceo- 

 latus, but is bright green and not so pointed behind. 



