U N 10. 



37 



f fWIDE. 



Mya pictorum. Lin. Mill. Bom. 



Poli. Schrb't. Pennant. Dill. 



Wood. Mat. Schreib. Pa Cost. 

 Mya ovalis. Don. 

 My a corrugata Maroccana. 1 Chem. 



margarita. Klein. 



angusta. Klein. 



Long thick horse mussel. Petiv. 

 Mya nodosa. Martini. Schreib. 



Wood. Dill. 

 My sea pictorum. Turt. 

 Potamida sicula. Swain. 

 TJnio rostrata. Lam. Pfeif. Mich. 



Desh. Bouil. G-ras. Puton. 



Potier. Proton. Villa. 

 Unio manca. Lam. Millet. Dup. 

 TJnio castaneus. Mill. 

 Unio elongatulus. Miihl. Rossm. 



Potier. Por. Dup. Villa. 

 Unio Turtonii. Payraud. Desh. 



Phili. Dup. 

 Unio lobatata. De Or. and J. 2 

 Unio Capigliolo. Payraud. Desh. 



More. Dup. Rossm. 

 Unio Requienii. Mich. Rossm. 



Qassies. Potier. . Dup. 

 Unio Deshayesii. Mich. Desh. 



Rossm. Brown. 

 Unio limosus. Nil. Rossm. 

 Unio longirostris. Zeigl. Potier. 



Por. Rossm. Villa. Schmidt. 

 Unio Limovianscse. Per. Menke. 

 Unio retusus. Held. 

 Unio ventrosus. Kiister. 

 Unio levigatus. Kiister. 

 Unio latirostris. Kiister. 

 Unio concinnus. Kiister. 



Unio corrosus. Villa. Por. 



Unio pollens. Parreyss. Kiist. 



Unio dactylus. Morelet. 



Unio mucidus. Morelet. 



Unio arcuatus. Bouch. Dup. 



Unio Ardusianus. Reynies. 



Unio Muelleri. 3 Rossm. 



Unio ponderosus. Spitzi. Rossm. 



Unio graniger. Zeig. 



Unio Nathusii. Kiist. 



Unio vindiflavus. Kiist. 



Unio Petrovichii. Kiist. 



*elongatus. Pfeif. 

 Unio Aradse. Phili. 

 Unio Grargottse. Phili. More. 

 Rossm. 



productus. Con. Kiist. 



*sagittiformis. Lea. 



*nasutus. Say. Barn. Swain. 

 Grould. Linsl. Dekay. 

 Unio rostratus. Valen. 

 Mya nasuta. Wood. 

 Unio subrostratus? Say. 

 Eurynea nasuta. Stimpson. (Agass. 

 MSS.) 



*Barrattii. Lea. 



*Fisherianus. Lea. Chenu. 



*aheneus. Lea. 



*Jayensis. Lea. Chenu. 



1 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 subse- 

 quently 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 draftsman or engraver, as the author speaks of the hinge 

 being like the common mussel. 



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



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

 10 



