FAMILY NAIADES. 



221 



2. Unio pictorum. Painters Unio. 



Shell ; elongately oblong, anterior side moderately short, rounded, 

 a little gaping in the region of the foot, posterior gently sloping, 

 valves concentrically fibrously ridged at intervals, fulvous 

 olive, ridges generally rather conspicuous, umboes but slightly 

 wrinkled, mostly eroded ; hinge similar to that of the prece- 

 ding species, rather less prominently developed. 



My a pictorum, Linnaeus (1758), Syst. Nat. ed. 10. p. 671. 



Unio pictorum, Pliilippson (1788), Nov. Test. Gen. p. 17. 



Unio rostrata, Lamarck (1819), Anim. sans vert. vol. vi. p. 77. 



Mysca pictorum, Turton (1822), Conch. Brit. p. 245. 



Unio limosus, Nilsson (1822), Moll. Suec. p. 110. 



Unio Turtoni, Payraudeau (1826), 3 foil, du Corse, p. 65. pi. ii. f. 2, 3. 



Unio Eequieni and Deshayesii, Mickaud (1831), Comp. de Drap. p. 106 and 

 107. pi. xvi. f. 24, 30. 



Unio longirostris, Ziegler (1842), Eossm. Icon. vol. xi. p. 13. f. 738. 



Unio Ardusianus, Keynies (1843), Lett. Moq.-Tand. p. 5. pi. i. f. 7, 8. 



Unio ponderosus, Spitzi (1844), Eossm. Icon. vol. xii. p. 31. f. 767. 



Unio Aleronii, Companyo and Massot (1845), Soc. Agr. Pyr.-Or. vol. ii. 

 p. 234. f. 2. 



Unio dactylus and mucidus, Morelet (1845), Hist. Moll, du Port. p. 110, 

 111. pi. xiv. f. 2, 3. 



Unio Philippi, Dupuy (1849), Cat. Extram. Test. no. 49. 



Unio platyrinchoideus, Eoussii, and curvirostris, Dupuy (1852), Hist. Moll. 

 vol. vi. p. 649, 653. pi. xviii. f. 16, 18. 



Mar gar on (Unio) pictorum, Lea (1852), Synops. Naiad, p. 36. 



Unio (Lymnium) pictorum and Eequienii, Moquin-Tandon (1855), Hist. 

 Moll. vol. ii. p. 574 to 576. pi. 1. f. 1 to 10. and pi. li. f. 1 to 10. 



