82 



AKODON T A. 



fWIDE. 



^■Marryataiia. Lea. 

 An. suhinflata. Antli. 



elongata. Swain. Han. 



*ensiformis. Spix. D^Ori. Schom. 

 Kust. H. & A. Adams. Han. 

 Lamproscapha ensiformis. Chenu. 



*cylindracea. Lea. Han. 



*subcylindracea. Lea. Linsl. Dekay. 

 Stimp. Han. 



lucida. D^Orh. 



*Buclianensis. Lea. Han. 



*Senegalensis. Lea. 



*Daliomeyensis. Lea. 



"•^gracilis. Lea. 



*"W]ieatleyi. Lea. H. Adams. 



*Amazonensis. Lea. 



*exilis.' Lea. Han. 

 An. polita. Mouss. 

 An. siliqua. Kiist. 



WIDE. 



*Sclir6teriana. Lea. Hupe. 



OBOVATE. 



*obtusa. Spix. Kust, Mori. Hupie. 

 An. lituratum. Spix. 



Montezuma. Lea. 



*trigona.^ Spix. D^Orh. Kiist. 



*sirionos.' D^Orl. Hupe. Mart. 

 An. Ferrarisi. D''Orh. 



*Patagonica. Lam. Kiist. Mart. 



*lato-inarginata.^ Lea. D^Orb. Von 

 Mar. 

 An. trapezeus?^ Spix. 

 An. exotica? Cuv. 

 An. memhranacea.^ D''Orh. Hupe. 

 Patularia rotunda. Sivain. 

 Patularia lato-marginata. Chenu. 



*Spixii. D'Orh. 



An. rotundus. Spix. Kiist. 

 An. trapezium. Mori. 



porcifer.^ Gray. 



*trapezialis. Lam. Blain. Pot. Kiist. 

 Hupe. Mart. 



^ Prof. Kirtland informed me that he received this shell from Wallingford, Conn., taken from some 

 of the branches of the Quinipiak River, but I think this must be an error. When I described it, I 

 mentioned having purchased it of Mr. Warren, a dealer in Boston, who could give me no idea whence it 

 came. I never supposed it to be an American s^Decies, and my conclusion is justified, I think, by having 

 received the same species from Dr. Vondembusch, of Bremen, he having procured it from Java. 



^ F&-ussac considered trigona the same as crassa, Swainson. The two figures, however, appear to 

 nie to be too different to be considered the same. 



' The specimen sent to me by M. D'Orbigny under the name of sirionos does not correspond with 

 his figure in Voy. Am. 3Ier., PI. 74, Pigs. 4-6, and PI. 80, Figs. 1 and 3, which I think are drawn from a 

 lato-marginata, Lea; but it is, I think, the same as trigona., Spix. 



'' The Patagonica and lato-marginata., when they are better observed, may prove to be the same. 



* Spis's figure so closely resembles the lato-marginata, that I scarcely feel a doubt as to their being 

 the same. He does not, however, notice the broad margin which is so characteristic of this species. 



^ See note 4, p. 55. 



' Never having seen this species, I place it here on Dr. Gray's authority. Pro. Zool. Soc. 1834, p. 58. 



