UNio. 143 



Mi/a ovalis, DoNov. Brit. Shells, vol. iv. pi. 89. — Mont. Test. Brit. p. 34. 

 Unio piotorum, Draparnaud, Moll. Terr, et FIuv. France, pi. 11, f. 4. — Flem. 

 Brit. Anim. p. 416. — Gray, Manual Land and F. W. Shells, 

 p. 295, pi. 2, f. 11.— Brown, Illust. Conch. G. B. p. 81, pi. 31, 

 f. 7, 9, 10, 11. — Lamarck, Anim. s. Vert. (ed. Desh.) vol. vi. 

 p. 541 (partly). — Pfeiffer, Deutsch. Land iind Siissw. Moll, 

 pt. 1, p. 115, pi. 5, f. 9, 10, and pt. 2, pi. 2, f. 24 (Young).— 

 NiLSSON, Moll. Sueciffi Terr, et Fluv. p. 111. — Blainv. Man. 

 Malacologie, pi. 67, f. 2. — Crouch, Introd. Conch, pi. 9, f. 4. — 

 KicKX Moll. Brabant. Austral, p. 84. — Rossmasler, Icon. 

 Land und Siissw. Moll. figs. 71, 196, 409, 587, 588, 589, 

 590, 741, 762, 76,3, 764, 765, 767, 768, 769, 780.— Hanl. 

 Recent Shells, vol. i. p. 205, pi. 2, Mya, f. 26. 

 „ rostrata, Lamarck, Anim. s. Vert. (ed. Desh.) vol. vi. p. 540. — Brown, 

 111. Conch. G. B. p. 82, pi. 32, f. 9, 10. — Pfeiffer, Deutsch. 

 Land und Siissw. Moll. pt. 1, p. 114, pi. 5, f. 8. — Kickx, Moll. 

 Brabant. Austral, p. 83. — Michaud, Comp. Moll. Ter. et Fluv. 

 France, p. 108, pi. 16, f. 55. — Gras, Moll. Terr, et Fluv. 

 France, p. 71, pi. 5, f. 21. 

 Mysca pictorum, Turton, Dithyra Brit. p. 245 ; Manual L. and F. W. Shells, 



p. 20, f. 11. 

 [Titio Ihnosus, Nilsson, Moll. Suecife Terr, et Fluv. p. 110. — Ro.ssmas. Iconog. 

 Land und Siissw. Moll. pt. 3, p. 24, pi. 13, f. 199. 

 „ Deshaysii, MicHAun, Comp. Moll. T. et Fl. France, p. 107, pi. 16, f. 30.— r 

 Brown, Illust. Conch. G. B. p. 81, pi. 32, f. 1 to 4. — Ross- 

 mas, Iconog. Land und SUssw. Moll. pt. 3, p. 23, pi. 13, 

 f. 197.— Gras, Moll. Ter. et Fluv. France, App. 

 „ lo7igirostris, Ziegl. in Rossmas. Iconog. pt. 3, p. 26, pi. 14, f. 200 and 

 pt. 12, p. 13, pi. 54, f. 38. 

 Encyclop. Method. Vers, pi. 248, f. 4. 



Although our synonymy of this well-known Uiiio may 

 seem tolerably copious, it might without much difficulty be 

 considerably enlarged, and embrace several other supposed 

 species (at least we surmise so) without straining too far 

 the elastic law of variation. As it is, we have followed the 

 dictum of Rossmasler, whose ample opportunities of study- 

 ing and comparing the diversified and aberrant forms of the 

 Uniones of an entire continent, must impart to his opinion 

 a far higher value than our own more limited experience 

 can pretend to. Nevertheless, we may remark as a curious 

 fact, that we do not observe in his delineation of the Con- 



