40 



UNIO. 



Unio explicatus. Morelet. 



Unio explicatus. ( ?) 



Unio Fellmanni. Desk. 



Unio Fontainiana. D' Orb. 



Unio furvus. Con. 



Unio gangrenosus. Schmidt. 



Unio generosus. 1 Gould. 



Unio gibbus. Speng. 



Unio glaucinus. Zeig. Por. 



Unio Grcenlandicus. Schro. Fer. 



Unio granulifera. Dunker. 



Unio Jacqueminii. Dup. 



Unio Juliani. Rang. 



Unio Largillierti. Phili. 



Unio Liebrnanni. Phili. 



Unio ligula. Mouss. 



Unio macropterus. Dunker. 



Unio metastriatus. Com. 



Unio Mexicanus. Phili. 



Unio Moravicus. Jay's Cat. 



Unio Moreleti. _Z)esA. 



Unio Morini. Morelet. 



Unio musivus. Speng. 



Unio Mytiloides. Desh. 



Unio nigricans. Menlce. 



Unio nitidens. -Fer. 



Unio nuculinus. Phili. 



Unio nuperus. Zezo/. 



Unio nuxpersica. Dunker. 



Unio obtusa. Poller and Michaud. 



Unio obtusus. .Fer. 



Unio orientalis. J^sr. 



Unio ostreatus. Morelet. 



Unio paludosus. Morelet. 



Unio parallelus. Cow. 



Unio perplicatus. Core. 



Unio Pequottinus. Linsley. 



Unio Pfeifferi. Dunker. 



Unio Philippii. .Dwp. 



Unio planivalvis. Morelet. 



Unio platyrinchoideus. -Z)wp. 



Unio plombarius. Villa. 



Unio polita. Mousson. 



Unio preciosus. .Fer. 



Unio pruneosus. Ze«£r. 



Unio psoricus. Morelet. 



Unio pulchellus. Fer. 



Unio puniceus. Said. 



Unio purpuriatus. &n/. 



Unio raristillus. Morelet. 



Unio Roisii. Mich. 



Unio Rousii. -Dwp. 



Unio scamnatus. Morelet. 



Unio scutulatus. Morelet. 



Unio semiplicatus. Troschel. 



Unio spheniopsis. Morelet. 



Unio Spinelli. Ui7Za. 



Unio Steveniana. Krynicki. 



Unio testidineus. Morelet. 



Unio truncatosus. Potier. 



Unio truncatus. Speng. 



Unio Zeyheri. Menke. 



Unio Zimermani. Stentz. Potier* 



The following species are supposed to exist in a 

 fossil state. As the casts only are usually ob- 

 served, it must be a matter of great doubt as to 

 the propriety of making species where that is the 

 case: — 



Unio abbreviatus. Cfoldfuss. 

 Unio abductus. Phili. 

 Unio acutus. Sow. Flem. 

 Unio aduncus. Sow. 

 Unio atratus. Groldfuss. 

 Unio ambiguus. Soiv. 

 Unio Ansticei. Sow. 

 Unio antiquior. Strickland. 

 Unio antiquus. Sow. 



1 Dr. Gould (Boston Nat. Hist. Soc, April, 1847) says it resembles Anodonta Vondcnbuschiana, Lea, most 

 likely he means Margaritana VonderibuscMana, now transferred to Monocondyloza. 



2 Deshayes, in Jacquemont's Voy. to India, t. xviii. Fig. 3, gives an Iridina (new), and the Unio corrugalus, 

 marginalis, and coeruleus ? without names or descriptions ! 



In a catalogue of fresh water and land shells, Ferussac says that a Unio (species uncertain) was found in 

 Berg River near the Cape of Good Hope. 



