48 



ANODONTA, 



OVAL. 



Myt. anatinus. Lin. Chem. Schro. 



Schum. Wood. Monta. Don. 



Da Costa. Penn. Shep. Tur. 



Dill. Mat. Schreib. 



Myt. stagnalis. Gmel. Dill. Sow. 



Schreib. 

 Myt. fluviatilis. 1 Gfmel. Schreib. 

 Myt. fucatus. Dill. 

 Myt. Zellensis. Q-mel. Schro. 



Schreib. 

 Myt. Avonensis. Monta. Wood. 



Ed. Encyclopaedia. 

 Myt. radiatus. 2 Mill. Schro. 



Schreib. 

 Myt. incrassatus. Shep. 

 Myt. macula. Shep. 



fragilis. Klein. 



Musculus fluviatilis. Klein. 

 Musculus latus. Klein.- 

 Musculus angustior. Klein. 

 Grand Moule des etang. Geoff. 

 An. anatina. Lam. Guv. Dill. 



Dose. Drap. Sow. Pfeif. Flem. 



Grat. Des Moid. Stud. Bouil. 



Macgil. Phili. Menlce. Desh. 



More. Goup. Nils. Put. Kilst. 



Dup. Aid. Graells. Villa. 



Klees. Por. Gass. Pouch. Pot. 

 An. sulcata. Lam. Nils. Vill. 

 An. dentiens. Menke. 

 An. intermedia. Lam. Pfeif. Bouil. 



Menke. Desh. Bouch. Dup. Pot. 

 An. variabilis. (Var. b.) Drap. 

 Vill. 



fOVAL. 



Menke. 

 Dup. Kiist. 



An. cellensis. Pfeif. Menke. Rossm. 



More. Kiist. Bosc. Dup. Vill. 

 An. ventricosa. Pfeif. 



Bouch. Vill. Pot. 

 An. ponderosa. 3 Pfeif. Menke. Pot. 



Por. Dup. Bossm. Kilst. Held. 



Graells. 

 An. paludosus. Tur. 

 An. stagnalis. Bosc. 4 

 An. fluviatilis. Bosc. 

 An. grossa. Zeig. 

 An. compressa. Menke. 

 An. obvoluta. Zeig. 

 An. complanata. Zeig. Rossm. 



Menke. Kiist. 

 An. rhomboidea. Schlut. Rossm. 

 An. spuria. Count Yoldis Letter. 

 An. proboscidalis. Zeig. 

 An. piseinalis. Nil. Gass. Pot. 



Dup. Kiist. Rossm. Vill. 

 An. rostrata. Kokeil. Rossm. Dup. 



Held. Kiist. Vill 

 An. attenuata. Held/ 

 An. limpida. Zeigler. 

 An. exulcerata. Vill. Por. 

 An. Klettii. Parr. 

 An. convexa. Dup. 

 An. Rossmaesleriana. Dup. 

 An. regularis. More. 

 An. maculenta. More. 

 An. Lusitania. More. 

 An. ranarum. More. 

 An. elongata. Stentz. 

 An. coarctata. Pot. 



1 Gnielin states this shell to be from the fresh waters of Europe, and allied to Anatina. If this be true, there 

 cannot be a doubt of its being the same with cygnea. The fluviatilis of Solander and Dillwyn is said to be from 

 North America, and Say's cataracta is the same, no doubt. 



2 Fide Dillwyn. 



3 This and the grossa are certainly very diiferent in aspect from the cygnea, Lam., being more ponderous and 

 less produced behind. This diiference may, however, be effected by locality. Should it prove constant, ponderosa 

 ought to be considered a distinct species, and such may prove to be the fact. 



4 I presume that Bosc meant the same variety as Myt. fluviatilis, Gmel. But he refers to Lister's PI. 157, 

 which is probably TJnio cariosus, Say. Bosc refers to Europe for the habitat of his species, and certainly there is 

 no species in Europe like Lister's figure. 



5 He since considers it a variety of cellensis, Pfeif. 



