ANODONTA. 



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OBOVATE. 



An. feminalis. 

 polita. Mouss. 1 



ARCUATE. 



*tenebricosa. Lea. D' Orb. 

 *tenuis. Lea. 



solidula. Deville and Hupipe. 

 *arcuata. Fer. 



sinuosa. Lam. Lupuy ? 

 *soleniformis. D' Orb. 



The following species are unknown to me: 



An. arcuta. Caill. 



An. atrovirens. Phili. 



An. Eambousearum. Morelet. 



An. Benacensis. Vill. 



An. Burroughiana. Ohenu. 2 



An. Charpentierii. Kiist. 



An. Chinensis. Fer. 



An. ciconia. Gould. 



An. cimbula. Vill. 



An. cornea. Phili. 



An. crassa. Menifee. 



An. curvatus. Fer. 



An. folium. Fer. 



An. gibbum. Benson. 



An. gigantea. 3 Middendorff. 



An. glabra. £ez#r. FVZZ. 



An. Guilliani. liecluz. 



An. Heldii. ifwstf. 



An. Housatonica. Linsley. 



An. impura. /fey. 



An. inoscularis. Gfould. 



An. Jobae. Lupuy. 



An. leprosa. Parr. Vill. 



An. lugubris. jSizy. 



An. lurulentus. Morelet. 



An. Middendorffii. Xea. 



An. Nicaragua. Phili. 



An. Nilssoni. ^T-M-s-i. 



An. Onowensis. Lea. 



An. opilina. Kiist. 



An. fragilis. Menifee. 



An. pictus. Swain. 



An. placitus. Hold. 



An. Saliveniana. Gould. 



An. Sedakowii. Siemasleo. 



An. siliqua. ifws£. 



An. sinuosis. Swain. 



An. soleniformis. Benson. 



An. Tawaii. Rang. 



Fossil Species. 



An. Abyssina. Morton. 

 An. antiqua. L' Orb. 

 An. Cordieri. D' Orb. 



George Simpson, from Vancouver, and to her I owe the possession of a fine and perfect specimen. In the collec- 

 tion of the Exploring Expedition, I recognized many fine specimens which Captain Wilkes brought from Columbia 

 River. Some of them my friend Dr. Gould has since characterized as a distinct species, but in this I should not 

 agree with him. 



1 Fresh Water and Land Shells of Java, PI. 19, Fig. 20. 



2 Livr. 81, PL 3, Fig. 3. This name and figure are placed to two different species in this plate. 



3 A specimen of this shell from the River Onow, Northern Siberia, was presented to the Boston Soc. Nat. 

 Hist, by Dr. Gould. It is stated to be "11 inches long and 6J high." (Proceedings, March, 1849.) I presume 

 this is a distinct species, but, without a description or view, I am unable to determine. The name, however, is 

 preoccupied, and I propose to substitute Onowensis, as the author's name is also preoccupied. 



14 



