654 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



*Anodon bonelli Sowerby, Conch. Icon., XVII, 1867, pi. xr, fig. 34. 

 ^Microcondylaea ?>oneZK Clessin, Conch. Cab. Ano., 1861, p. 257; Moll. Osterr., 1887, 



p. 719, figs. 486, 487.—* PyETKL, Conch. Sam. Ill, 1890, p. 175. 

 "Microcondylus bonelli Drouet, Jl. de Conch., xxvi, 1879, p. 138; Union. Italic, 



1885, p. 110. 

 "^ Mar (jar liana (Microcondylaea) bonellii Kobelt, Icon., 1884, p. 62, pi. xxv, figs. 



208, 209. 

 * Leguminaia bonellii Westerlund Faun. Pal., II, Pt. 7, 1890, p. 191. 



South central Europe. 



Genus LASTENA Rafinesque, 1820. 



(Type, Lastena lata Rafinesque.) 



Lastena Rafinesque, Ann. Gen. Sci. Phys. Brux., 1820, p. 316. 

 Odatelia Rafinesque, Atlantic Jl. and Friend., 1832, p. 154. 

 Leptodea {Rafinesque) Conrad, Pr. Ac. N. Sci. Phila., 1853, p. 262. 



Shell elongated, subsolid, mequilatural, generally wider in front, 

 rounded-truncate at anterior base, pointed at post-basal region, aud 

 having a low posterior ridge, with one or more secondary ridges above 

 it; beaks low, sculpture consisting of a few coarse, irregular, longi- 

 tudinal folds; epidermis shining, often rayed; a single imperfect tooth 

 occurs in each valve, and sometimes vestiges of laterals; there is one 

 roughened dorsal scar in the shallow beak cavity; muscle scars very 

 large, deep and distinct, the posterior greatly elongated; nacre pur- 

 plish, shading to blue at the edge; palleal line radially ridged. 



Animal with very long branchiae, inner and outer about alike in size 

 and form, projecting free slightly behind, the inner free from the abdom- 

 inal sac nearly the whole length, brownish throughout; palpi long, 

 large; mantle thickened at edge, brown, black above; branchial opening 

 large, with heavy papillae; anal opening large, without papillae; super- 

 anal opening united below; foot very large when living, club-shaped, 

 capable of great extension. No gravid specimens have been seen, but 

 the outer branchiae are probably used as a marsupium. 



t LASTENA LATA Rafinesque. 



''Anodonta {Lastena) lata Rafinesque, Ann. Gen. Sci. Brux., V, 1820, p. 317, 



pi. Lxxxii, figs. 17, 18. 

 *Anodonta lata Ferussac, Guer. Mag., 1835, p. 25.—* Chenu, Bib. Conch., 1st ser., 



Ill, 1845, p. 26, pi. in, figs. 17, 18. 

 ""Leptodea lata CoNRAD,Pr. Ac. N. Sci. Phila., VI, 1853, p. 262. 

 *Anodon lata Sowerby, Conch. Icon., XVII, 1867, pi. xix, fig. 76. 



* Unio latMS Conrad, New F. W. Shells, 1834, p. 70.—* Say, Am. Conch., VI, 1834.— 



* Kuster, Couch. Cab. ITnio, 1861, p. 388, pi. lxvii, fig. 5. 

 Unio dehiscens Say, N. Harm. Diss., II, 1829, p. 308; *Am. Conch., Ill, 1830, pi. 

 XXIV.—* Deshayes, An. sans Vert., 2d ed., VI, 1835, p. 554; 3d ed., II, 1839, 

 p. 674.— * Hanley, Test. Moll., 1842, p. 204; * Biv. Shells, 1843, p. 204, pi. 

 XXI, fig. 36.—* Chenu, Bib. Conch., 1st ser., Ill, 1845, p. 32, pi. ix, figs. 7-9.— 

 *CATLOwand Reeve, Conch. Nom., 1845, p. 58.— * Sowerby, Conch. Icon., 

 XVI, 1868, pi. Lxxv, fig. 393. 



* Margarita ( Unio) dehiscens Lea, Syn., 1836, p. 35 ; 1838, p. 23. 



