(J78 PROCEEDINGS OF THE NATIONAL MUSEUM. 



" Maryaron ( I'nio) craxyiix I.I:A. Syn., 1S52, p. l>9: 1870, p. 62.' 



* Unio auriculariua Si-KXtii.Ki:, Skriv. Nat. Selsk., Ill, 1792, p. 54. WESTKK- 



LUND, Faim. Pal., II, Pt. 7, 1890, p. 50. 

 Unio rugusa POIKKT, Coq. Flnv.,et Terr, do 1'Aisne, 1801, p. !().">.- 



* Unio sinuata LAMARCK, Au. sans Vert., VI, 1819, p. 70. :! BLAINVII.LK, Man., 



1825, p. o39, pi. LXVII, fig. 3. * DESHAYES, Enc. M<Hh.. II, 1827, p. 151, pi. 

 CCXLVIII, tig. 1 ; II, 1830, p. 579, pi. c< xi.vin, fig. 1, la, 1ft. * S<;A\/.IX, Mem. 

 Hist. Nat. Strash., Ill, 18-12, II, p. 8. * PUTON. Moll.Vosges, 1847, p. 72. 



''Unio (I'otamida) shniata SWAINSON, Tr. on Mai., 1840, p. 26X. 



~ Unio xinnatH* KOSSMASSLEK, Icon., Ill, 1836, p. 22. pi. xin, fig. 195. UASSIES, 

 Moll, de 1'Ag., 1849, p. 198. 'DuPUY, Hist. Moil. Fr., 1852, p. 630, pi. xxm, 

 <ig. 7. *KOSSMASSI.KH, Icon., Ill, 1854, p. 38, pi. LXX, fig. 853, 853a.' ; 

 *MOQUIN-TANDOX, Moll. Terr, and Fluv. Fr., II, 1855, p. 567; III, pi. XLVIII, 

 ligs. 1-3. ' DIJOI-ET, Nay. Fr., II, 1857, p. 61, pi. n. "HKSSLIXO, Die Perl, 

 and Ihro Perl en, 1859, p. 184. '&OWERBY, Conch. Icon., XVI, pi. LXII, 

 fig. 311. P.KTEL, Conch. Sam, III, 1890, p. 167. * LOCARD, Coq. de Fr., 

 1893, p. 151, fig. 164. 



*1Unio Utoi-alisC. PFEIFKER, Nat. Deutsch. L. nnd S. W. Moll., Pt. 1, 1821, p. 117, 

 pi. v, fig. 12.' 



*Unio crassixxintux HANLEY, Test. Moll., 1842, p. 209; * Biv. Shells, 1843, p. 209, 

 pi. xxm, fig. 54. * CATLOW and REEVE, Conch. Nom., 1845, p. 58. 



* Unio gartjottn' PHILIPPI, Moll. Sic., 1836, p. 66. *ROSSMASSLER, Icon., VII aud 



VIII, 1838, p. 26, pi. xxxv, fig. 493. * DHOUKT, .11. de Conch., XXIX., 1881, 

 p. 25.* WKSTEBLUND, Fann. Pal., II, Pt. 7, 1890, p. 156. 



Southern Europe; possibly into Asia Minor and southwest Siberia. 



tMARGARITANA LAOSENSIS Lea. 



* Unio laosensis LEA, Pr. Ac. Nat. Sci. Phila., VII, 1863, p. 190; *J1. Ac. N. Sci. 



Phila., VI, 1866, p. 63, pi. xxi, fig. 61 ; * Obs., XT, 1867, p 67, pi. xxi, fig. 61. 

 * SOWERBY, Conch. Icon., XVI, 1866, pi. XLVII, fig. 256. * P.KTKL, Couch. 

 Sam., Ill, 1890, p. 156. 



* Margaron ( f'nio) laosensis LEA, Syn., 1870, p. 62. 

 Unio snla THEOBALD (where?). 



Laos Mountains, Cambodia; Siara. 



1 It has often been impossible to determine what species has been referred to by 

 authors under the name crassiis. In cases where they have cited this species from 

 the north of Europe I have no doubt that they either had Margarilana margaritiftra 

 or Unio batavus before them. lu those cases where I could not be certain as to what 

 was meant I have omitted references. 



2 According to Moquiu Taudon this is U. sinualns Lamarck. 



3 Lamarck refers to Encyc. Mth., 1797, pi. CCXLVIII, figs, la, 16, which seem to be 

 the crassus of Ketzius. Lea, who examined Lamarck's type, says he had thought it 

 was the MaryaritaiiH margaritifcra, but that it had lateral teeth. (Obs. I, pp. 35, 198.) 



4 These figures look something like a heavy inflated Lampsilis alatus Say, but are 

 probably the crasmm of lietzius. 



"Given to Sganziu by M. Fabert, chief of batalliou of infantry, as having been 

 found at St. Paul in the Isle of IJourbou,. but Sganxiu very much doubts the locality. 

 Of course it was never found in the Indian Ocean region. 



"A magnificent figure of this fine species, and in a, which shows the hinge, the 

 laterals are plainly delineated. 



7 Dr. Lea is doubtful about this being Htoralis, and I am sure it is not. It appears 

 more like M. cransiis than anything else. 



"Dr. Lea makes this a synonym of PfeifFer's rlongatulns, which is, I believe, quite 

 near to U. piclorum. Kossmassler's figure shows a shell very much like Margantana 

 margtiriiifera, but it liax lateral teeth. 



