UXIO. 



59 



Mya pidorum. Lin. Mill. Bom. 



Poll. Schrbt. Pe7inant. Dill. 



Wood. Mat. Schreih. Pa Cost. 



Alten. 

 Musculus angustior. List. Hist. Ani- 



malia, p. 149. 

 JLya corrugata Maroccana} Cheni. 



margaritica. Klein. 



augusta. Klein. 



Long thick horse mussel. Petiv. 

 Mya nodosa. Martini. Lin. Schreih. 



Wood. Dill. 

 Mysca pictorum. Turt. 

 Potomida sicula. Swain!' 

 Vnio delphinus. Speng. 

 Unio inflatus. Stud. 

 Unio rostratus. Lam. Pfeif. Mich. 



Desh. Bouil. Gras. Puton. 



Potter. Broivn. Villa. Waard. 



Chenu. Fitz. Gras. 

 Unio manca. Lam,. Millet. Dup. 



Bourg. 

 Unio castaneus. Mill. 

 Unio elongatulics. Miihl. Rossm. 



Potier. Por. Dup. Villa. 

 Unio Turtonii. Payr. Desh. Phili. 



Dup. Bourg. 

 Unio lohatata. De Cr. and J? 

 Unio Capigliolo. Payr. Desh. More. 



Dup. Rossm. Grat. Moq. 

 Unio Requienii. Mich. Rossm. Gas- 



sies. Potier. Dup. Gras. Grat. 



Mous. Bourg. Stah. Moq. 

 Unio Deshayesii. Mich. Desh. 



Rossm. Broivn. Gras. Grat. 

 Unio platyrinchoideus. Dup. Bourg. 



Unio limosus. Nil. 

 Unio longirostris. Zeigl. Potier. 

 Por. Rossm. Villa. Schmidt. 

 Unio lemovicense. Fer. Menhe. 

 Unio retusus. Meld. 

 Unio ventrosus. KUster. 

 Kilster. 

 Kiister. 

 Kilster. 

 Villa. Por. 

 Villa. 

 Parreyss. 

 Morelet. 

 Morelet. 

 Bouch. 



Kilst. 



Unio levigatus. 



Unio latirostris, 



Unio concinnus. 



Unio corrosus. 



Unio Spinelli. 



Unio pallens. 



Unio dactylus. 



Unio mucidus. 



Unio arcuatus. Bouch. Dup. 



Unio Ardusianus. Reyjiies. 



Unio Muelleri.* Rossm. 



Unio ponderosus. Spitzi. Rossm. 



Unio graniger. Zieg. 



Unio decipiens. Zieg. MSS. Bourg. 



Unio Nathusii. Kilst. 



Unio vindijiavus. Kilst. 



Unio Petrovichii. Kilst. 



Unio dubius. Fitz. 



Unio Ronsii. Dup. 



Unio proechus. Bourg. 



Unio actaphilus. Bourg. 



Unio vulgaris. Stab. 



Unio Blauneri. Shutt. Stab. 



Unio subreneformis. Bourg. 



Unio Penchinatianus. Bourg. 



Unio Graellsianus. Bourg. 



Unio Gourquinianus. Bourg. 



*elongatulus. Pfeif. Han. 

 Unio Aradx. Phili. 



^ Chemnitz figures this shell, vol. vi. table 3, Figs. 23 and 24. From the description and outline, I 

 have little doubt of its being a young pictorum., more than usually undulated in the region of the beaks. 

 Its being rugose over the whole surface, as mentioned by him, is not evidence against its being such. 

 As the first growth subsequently forms the beak of the shell, it ought of course to be rugose, if that be 

 the character of the shell. The inside view is without teeth, but this is doubtless the fault of the drafts- 

 man or engraver, as the avithor sjDeaks of the hinge being like the common mussel. 



^ I suspect this will prove to be the same as elongafulus, Pfeif., which may itself be only a var. of 

 pictorum. Swainson and Pfeiffer obtained them from Sicily. 



' Fide Philippi. Michaux's figure has more the appearance of U. Batavus. 



* I think this will be found to be a deformed pictorum. 



