686 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



*Unio pictoruni Guerin, Icon. Ecgne Auim., II, 1829-1844, pi. xxviii, fig. 16. — 



* BouRGUiGNAT, Mai. Alg., II, 1864, p. 292, pi. xxii, figs. 6-11.— ■ Eeeve, 

 Conch. Icon., XVI, 1865, pi. xxv, fig. 123. 



* U7iio requienii Michatjd, Comp. Hist. Nat. Moll. Fr., 1831, p. 106, pi. xvi, fig. 24.— 



* RossMASSLER, Icon., Ill, 1836, p. 24, pi. xiii, fig. 198.— *Gras, Moll. Isere, 

 1840, p. 21.— ■* Stabile, Faun. Lug., 1845, p. 62, pi. iii, fig. 1786.— * Gassies, 

 Moll. Ageu., 1849, p. 195, pi. i, figs. 4, 5.—* Dupuy, Hist. M. Fr., 1852, p. 652, 

 pi. xxvii,. fig. 18.— *KusrER, Conch. Cab. Unio, 1854, p. 126, pi. xxi, fig. 7; 

 XXVI, figs. 1-3; XXXVII, figs. 2-4.— * Drouet, Nay. Fr., II, 1857, p. 93, pi. vii, 

 figs. 1-3.— * MoussoN, Coq. Terr. Fluv. Pal., 1861, p. 66.—* Drouet, Moll. Cote 

 d'Or, 1867, p. 102.— *Benoit, Mus. Cat. Sic, 18^1, p. 170.— *Clessin, Moll. 

 Oest., 1887, p. 731, fig. 494.—* Westerlund, Faun. Pal., II, Pt. 7, 1890, p. 121.— 



* P.ETEL, Conch. Sam., Ill, 1890, p. 165. 



* Unio lohaia Philippi, Moll. Sic, 1836, p. 67. 



*Umo bandanii Rossmasslek, Icon., V, 1837, p. 22, pi. xxiv, fig. 341. 



* Unio imllens Eossmassler, Icon., XI, 184'-', p. 13, pi. liv, fig. 740.'— * Wester- 



lund, Faun. Pal., II, Pt. 7,1890, p. 114. 

 "Unio hispanus Eossmassler, Icon., XII, 1844, p. 26, pi. lvi, fig. 747. — *Bour- 



GUiGNAT, Moll. Pen. Con., 1863, p. 46, pi. xxiv, figs. 1-3.— * Bourguigxat, 



Eev. et Mag., XVII, 1865, p. 344, pi. xxiii, figs. 1-3.— *PiETEL, Conch. Sam., 



Ill, 1890, p. 155.—* Westerlund, Faun. Pal., II, Pt. 7, 1890, p. 139. 

 *Unio alcroni Companyo and Massot, Bull. Soc. Pyr. d'Or, VI, Pt. 2, 1845, p. 



234, fig. .—* BOURGUIGNAT, Moll. Pen. Con., 1863, p. 49, pi. xxiii, figs. 1-3; 



Eev. et Mag., XVII, 1865, pi. xix, figs. 1-3. 

 ""Unio rousii Dupuy, Hist. Moll., VI, 1852, p. 653, pi. xviii, fig. 18.— "Musgrave, 



Phot. Conch., 1863, pi. ii, fig. 7. 

 ' ''Unio valentinus Eossmassler, Icon., Ill, 1854, p. 37, pi. lxix, p. 852. — * BouR- 



GUiGNAT, Moll. Pen. Con., 1863, p. 45, pi. xxvii; Eev. et Mag. Zool., XVII, 



1865, p. 343, pi. XX.— *Westerlund, Faun. Pal., II, Pt. 7, 1890, p. 140,— 



*P.etel, Conch. Sam., Ill, 1890, p. 171. 



* Mavf/aron ( Unio) valentinus Lea, Syn., 1870, p. 52. 



* Unio ardusianus Moquin-Tandon, Hist. Moll. Fr., II, 1S55, p. 575.- — *Wester- 



lund, Faun. Pal., II, Pt. 7, 1890, p. 109.— "Locard, Coq. de Franc, 1893, 



p. 205. 

 "Unio graellsianus Bourguignat, Moll. Pen. Con., 1863, p. 47, pi. xxiii, figs. 



4-7; *Rev. et Mag., 1865, p. 345, pi. xix, figs. 4-7. — * AVesterlund, Faun. 



Pal., II, Pt. 7, 1890, p. 140. 

 *1Unio letourneuxi Bourguignat, Mai. Alg., 1864, p. 289, pi, xvii, fig. 47. — 



*Westerlund, Faun. Pal., II, Pt. 7, 1890, p. 58. — *P.etel, Conch. Sam., 



Ill, 1890, p. 157. 

 *Unio Goiirquinianus Bourguignat, Moll. Pen. Con., 1863, p. 48; *part, Rev. 



et Mag., 1865, p. 346, pi. xxii, figs. 1, 2. 

 ''Unio siculns Sowerby, Conch. Icon., XVI, 1868, pi. lxxi, fig. 364.-' 

 *Unio ravoisieri var. issericus Kobelt, Icon., new ser., I, 1884, p. 6.5, pi. xxviii, 



fig. 215.— *Westerlund, Faun. Pal., II, Pt. 7, 1890, p. 142. 

 "Unio alexandri Kobelt, Icon., 1st sup., 1895, p. 14, pi. ii, fig. 2. 



Entire circummediterraneau region. 



1 Credited by Eossmassler to Paxreyss. I do not know Avhere the latter described 

 it or whether he described it at all. 



-Moquin-Tandon credits this to a letter from Eeynies, 1843, and gives a reference 

 to p. 5, pi. I, figs. 6, 7, of the letter. I do not know that this was ever published. 

 He makes it a variety of requienii. 



3 This is Potamida sicula Swainson according to Sowerby. I refer Swaiuson's shell 

 to Unio pictornm. 



