DES MOINES ACADEMY OF SCIENCE. 



ingly variable form, and its synonomy is correspondingly large. A peculiar 

 quadrate form from Michigan received, at the hands of Mr Anthony, the name 

 of Alasmodonta rhowbloa. The figure to which reference is made does not 

 well illustrate the species. It is believed the following will prove to be syno- 

 nyms: Anodonta arkanseniste, Lea, A. ferrugiriea, Lea, A. tctrctfjonci, Lea, 

 ;uul A. shaffoeridna, Lea. The species is not far removed from A. undulata, 

 Say of the Atlantic drainage. Specimens are frequently found with a thicken- 

 ing on the dorsal margin which si mulates the cardinal tooth of MyrgaTticma* 

 Mi . Ainbony'-s specimens probabJy presented that feature, 



f Anodonta ferruginea, Lea. 



(Trans. Am. Phil. Soc., 2nd Series, Vol. VIIII, PI. XIX, FIjf, 4S.J 

 "Simon's Creek, Indiana." See under A- edentula, 



* A nodonlsi ferussaciana, Lea. 



(Trans. Am. Phil. Soc., Vol. V, PI. VI., Fig. 15.) 



Ranges from Montreal, Canada, to Kansas; to Vermillion river, Dakota. The 

 form has been erronously attributed to Western New York. It is the type of a 

 group of An(jdo'Hl<v which includes A. -argentea, A. denigrata, A* biicti* 

 nneusis, and A. nblita, and which is not altogether free from synonomy. 



1 A notion* it footiana, Lea. 



(Trans. Am. Phil. Soc., 2nd Series, Vol VIII, PI. XX, Fi-;. 44.) 

 The only locality, within the Mississippi basin, in which this form is known 

 to occur, is Chautauqua Lake, in Western New York, It abounds in very many 

 of the small Jakes in Wisconsin and Michigan, but, apparently, in those only 

 which are tributary to the Great Lakes. The most northerly recorded range 

 is Fort Winnebago, to Ottawa river, Canada. 



Anodonta gigantea, Lea, 



(Trans. Am. Phil. Soc., Vol. VI, PI I, Fi-. 1.) 



This species was described from a single valve obtained in the vicinity of Port 

 Gibson, Mississippi. . It is a member of the grandis group, to which it is ver v V 

 closely related. 



* Anodonta grand is, Say. 



(Not ftyuredo 



Described from the ' Upper Mississippi." Its range is very considerable 

 from Ohio to Texas; west to Nebraska and north to Minnesota. Throughout its 

 range it exhibits a very considerable diversity of form which is to be regarded as 



CATALOGUE 3. 



