I 



rSEUDANODONTA 335 



1836. Anodonta elongata : Holandre, Faune dipt. Moselle, 



p. 54. 

 ?1840. Anodon cygneus, var. complanata, Ziegl. MSiS. : Gray, 



in Turton's Manual, new ed., p. 291, fig. 



[In the 1857 edition this variety is suppressed 



and the figure described as " Anodon cygneus 



avonensis."] 

 1844. Anodonta minima, Millet : Joba, Bull. Soc. Hist. Nat. 



Metz, cahier 2, p. 44, pi. iv. [He quotes A. 



elongata, Hollandre, as a synonym.] 

 1849. Anodonta Jobce, Dupuy : Dupuy, Cat. Extramar. Gallice 



Test. [p. 3], no. 18; Hist. Nat. Moll. France, 



1852, p. 621. 

 1849. Anodonta Normandi, Dup. : Dupuy, o. c, [p. 3], no. 21 ; 



o. c, p. 620, pi. xvi, f. 15. 

 1852. Anodonta elongata, Holl. : Dupuy, Hist. Nat. Moll. 



France, p. 620, pi. xvi, f. 16. 

 1856. Anodonta complanata, Ziegl. : Moquin-Tandon, Hist. 



Moll. France, ii, p. 560, pi. xlv, f. 3 & 4. 

 1890. Anodonta (Pseudanodonta), elongata HoWandre : Wester- 



LUND, Fauna Paldarct. Region, vii, p. 307. 

 1890. Pseudanodonta Rothomcu/ensis : Locard, Ann. Soc. Linn. 



Lyon, xxxvi, pp. 56 & 134. 

 1890. Pseudanodonta imperialis : Locard, t. c, pp. 57 & 136. 



[Anodonta coarctata. Pot. & Mich. {Gall. Moll., ii, 1844, 

 p. 142) = A. parvula, Drouet (Rev. & Mag. Zool., 

 Ser. II, torn, iv, 1852, p. 249) is probably also a 

 synonym ; whilst 



Germain [Bidl. Soc. Amis Sci. Nat. Rouen, 1907, pp. 164, 

 168) would also include : Pseudanodonta Rayi 

 (Dupuy) ; P. septenlrionalis, Locard ; P. Servaini, 

 Locard; P. nantelica, Locard; P. aploa, Locard; 

 P. berryacensis, Dumas; P. Dumasi, Locard; and 

 P. Klettii ([Rossni. MS.] Scholtz).] 



First recorded as British in 1910, by F. Haas {Proc. 

 Maine. Soc. Loud., ix, p. 109), as P. elongata. 



British Distribution in Time : Holocene and Recent. 



Genus : 3. UNIO (Linnaeus MS.), Retzius. 



Etym. : — Lat. unio, (masc.) a single large pearl, (fem.) unity. 

 Type -.—Mya pictonnn, Linnaeus (selected by Gray, 1847). 

 {Mya, vett. auctt.) 



1788. Unio [Linnaeus MS.] : Retzius, Nova Test. Genera, p. 16. 



1815. Unionea : Rafinesque, Analyse Nature, p. 147. 



1815. Lymnium : Oken, Lehrh. Naturg., iii, Zool. abth. 1, 



p. 237. 

 1822. Mysca : Turton, Conch, ins. Brit., p. 243. 



